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Guides reducing token cost and response latency of LLM-based agents without degrading quality. Use when a user asks to "reduce our LLM API bill," "make the agent respond faster," "our token usage is too high," "should we use a smaller/cheaper model here," decide where to apply pr
Guides reducing token cost and response latency of LLM-based agents without degrading quality. Use when a user asks to "reduce our LLM API bill," "make the agent respond faster," "our token usage is too high," "should we use a smaller/cheaper model here," decide where to apply prompt caching, streaming, or batching, or needs to size a cost/latency budget before scaling an agent to more users.
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LLM API cost and response latency scale with tokens processed and number of model calls — both of which are almost always higher than necessary in a first working version of an agent, because it's easier to build without budgeting either. Left unaddressed, this shows up as a surprising bill at scale, or an agent that feels sluggish enough that users stop trusting it to be interactive. Unlike raw model-quality tuning, most of the levers here are structural and don't require changing which model you use at all: reducing redundant context, caching stable prompt prefixes, choosing the right model per step rather than the strongest model for everything, and parallelizing or streaming where the task allows it. This skill treats cost and latency together because most fixes affect both, though not always in the same direction.
Measure before optimizing. Instrument every model call with input tokens, output tokens, latency, and (if using tools) tool-call count. Aggregate by agent, by task type, and by pipeline stage — you cannot prioritize fixes without knowing which stage actually dominates cost or latency.
def call_llm(messages, tools=None):
start = time.monotonic()
response = client.messages.create(model=MODEL, messages=messages, tools=tools)
metrics.record(
stage="agent_loop",
input_tokens=response.usage.input_tokens,
output_tokens=response.usage.output_tokens,
latency_ms=(time.monotonic() - start) * 1000,
)
return response
Cut redundant context first — it's usually the largest and cheapest fix. Audit what's actually being sent on each call: full conversation history with no windowing, full raw tool outputs instead of trimmed results, duplicated retrieved chunks across turns. See prompt-and-context-engineering for concrete history-management and budgeting techniques — this is usually higher-leverage than model choice.
Use prompt caching for stable prefixes. If your provider supports prompt/context caching, structure calls so the stable part (system prompt, tool definitions, static reference material) forms a consistent prefix, and only the per-turn variable content (user message, retrieved chunks) changes after it. This reduces both cost and latency on cache hits, often substantially, but the exact discount and minimum cacheable prefix length are provider- and model-specific — check current documentation for the model you're using.
Right-size the model per step, not per agent. A multi-step pipeline rarely needs the strongest available model at every step:
plan step (ambiguous, needs strong reasoning) -> strongest available model
extraction/formatting step (well-specified) -> smaller/faster model
final safety/quality check -> smaller model or rule-based check
Validate this split against your eval suite (see agent-evaluation-and-guardrails) before committing — a cheaper model may be entirely adequate for a well-specified step, or may not be, and that's an empirical question, not an assumption.
Parallelize independent calls instead of serializing them. If a task requires several independent tool calls or sub-agent calls with no data dependency between them (see multi-agent-orchestration), issue them concurrently rather than one after another — this reduces wall-clock latency without changing total token cost.
Stream output for interactive use cases. For anything a human waits on synchronously, stream tokens as they're generated rather than waiting for the full response — this improves perceived latency significantly even when total generation time is unchanged, and costs nothing extra.
Batch non-interactive workloads. For background/bulk processing (e.g. classifying 10,000 tickets overnight) where no human is waiting synchronously, use a batch API if your provider offers one — batch endpoints commonly trade higher latency for meaningfully lower per-token cost, which is a good trade for offline work.
Cap retrieval and tool-result size deliberately (see rag-pipeline-design) — retrieving and injecting more chunks or more tool-result content than the task needs is a direct, avoidable token cost, not just a relevance-quality issue.
Set a cost/latency budget per task type and alert on regressions. Track cost and p50/p95 latency per task type over time; a prompt or tool change that silently doubles average tool-call count per task should show up as a tracked regression, not a surprise on the monthly invoice.
Symptom: Per-conversation cost grows steadily over a session's lifetime even though user requests stay similarly sized. Fix: This is almost always uncontrolled context growth (see prompt-and-context-engineering) — audit what's actually in the context at each turn rather than assuming it's a model-pricing issue.
Symptom: Switching to a cheaper model for a step reduces cost but increases the retry/failure rate enough that total cost (including retries) doesn't actually improve, or quality visibly degrades. Fix: Validate any model downgrade against the eval suite including its retry/failure rate, not just raw per-call price — measure end-to-end cost and quality together before adopting the change.
Symptom: An interactive chat agent feels slow even though total token generation time hasn't changed. Fix: Add streaming so the user sees partial output immediately; perceived latency, not just raw generation time, is what interactive users experience.
Symptom: A multi-step agent's latency is dominated by several independent tool calls executed one after another for no data-dependency reason. Fix: Identify which calls are genuinely independent and parallelize them; this is a wall-clock latency fix (not a cost fix) that requires no model or prompt change.
Symptom: Prompt caching isn't producing the expected savings even though the system prompt is unchanged between calls. Fix: Check that the cached content is actually first in the prompt and that nothing before it (e.g. a timestamp, a session id) varies per call — even a small change earlier in the prefix invalidates the cache for everything after it in most caching implementations; verify the minimum cacheable length and current cache-hit behavior against your provider's documentation, since these details are provider-specific.
Task: a document-classification agent processing ~5,000 documents/day was using the strongest available model for every document and running fully synchronously, at higher cost and latency than the business need (next-morning results) required.
Before:
model: strongest-tier model for every document
mode: synchronous, one call per document, serialized
avg cost/doc: $X (baseline)
avg latency/doc: ~4s, ~5.5 hours total for 5,000 docs run serially
After applying this skill's levers:
model: smaller/faster model for the classification step (validated against
eval suite: pass rate within 1.5 points of strongest-tier model on
the labeled eval set for this specific task)
mode: batch API, submitted as one batch job overnight
context: system prompt + label taxonomy cached as a stable prefix;
per-document content is the only variable part
result: total batch cost reduced substantially per the provider's batch
discount; total wall-clock time no longer matters since results
are needed by morning, not synchronously
The model downgrade was only adopted after the eval suite (see agent-evaluation-and-guardrails) confirmed classification accuracy held within an acceptable margin on this narrow, well-specified task — the same downgrade was explicitly not applied to a separate, more ambiguous summarization step in the same pipeline, which stayed on the stronger model after the eval suite showed a real quality gap there.
name: llm-cost-and-latency-optimization description: > Guides reducing token cost and response latency of LLM-based agents without degrading quality. Use when a user asks to "reduce our LLM API bill," "make the agent respond faster," "our token usage is too high," "should we use a smaller/cheaper model here," decide where to apply prompt caching, streaming, or batching, or needs to size a cost/latency budget before scaling an agent to more users. license: Apache-2.0 compatibility: "Claude Code, GitHub Copilot, OpenAI Codex, Cursor, Gemini CLI" metadata: domain: ai-agent maturity: stable
---
name: llm-cost-and-latency-optimization
description: >
Guides reducing token cost and response latency of LLM-based agents
without degrading quality. Use when a user asks to "reduce our LLM API
bill," "make the agent respond faster," "our token usage is too high,"
"should we use a smaller/cheaper model here," decide where to apply
prompt caching, streaming, or batching, or needs to size a cost/latency
budget before scaling an agent to more users.
license: Apache-2.0
compatibility: "Claude Code, GitHub Copilot, OpenAI Codex, Cursor, Gemini CLI"
metadata:
domain: ai-agent
maturity: stable
---
# LLM Cost and Latency Optimization
## Purpose
LLM API cost and response latency scale with tokens processed and number of
model calls — both of which are almost always higher than necessary in a
first working version of an agent, because it's easier to build without
budgeting either. Left unaddressed, this shows up as a surprising bill at
scale, or an agent that feels sluggish enough that users stop trusting it
to be interactive. Unlike raw model-quality tuning, most of the levers here
are structural and don't require changing which model you use at all:
reducing redundant context, caching stable prompt prefixes, choosing the
right model per step rather than the strongest model for everything, and
parallelizing or streaming where the task allows it. This skill treats cost
and latency together because most fixes affect both, though not always in
the same direction.
## When to use
- Token/API costs for an agent are higher than expected or growing faster
than usage.
- An agent's end-to-end response time is too slow for its use case
(interactive chat vs. background batch job have very different
tolerances).
- Deciding whether a task step needs the strongest available model or can
use a smaller/cheaper one.
- Evaluating whether prompt caching, batching, or streaming applies to a
given workload.
- Sizing a cost/latency budget before scaling an agent from a prototype to
production traffic.
- Reviewing an agent design for redundant or unnecessary model calls before
it ships.
## Prerequisites & environment
- Access to per-call token usage and latency metrics from your model
provider's API responses (most APIs return input/output token counts per
call; capture and log these, don't estimate).
- Current pricing and context-window/caching capabilities for the specific
model(s) in use — these vary by vendor and change over time, so verify
against current provider documentation rather than assuming figures from
memory or from a different model generation.
- A representative load profile (typical conversation length, typical tool
call count per task) to reason about cost/latency at realistic scale,
not just a single test call.
## Step-by-step guidance
1. **Measure before optimizing.** Instrument every model call with input
tokens, output tokens, latency, and (if using tools) tool-call count.
Aggregate by agent, by task type, and by pipeline stage — you cannot
prioritize fixes without knowing which stage actually dominates cost or
latency.
```python
def call_llm(messages, tools=None):
start = time.monotonic()
response = client.messages.create(model=MODEL, messages=messages, tools=tools)
metrics.record(
stage="agent_loop",
input_tokens=response.usage.input_tokens,
output_tokens=response.usage.output_tokens,
latency_ms=(time.monotonic() - start) * 1000,
)
return response
```
2. **Cut redundant context first — it's usually the largest and cheapest
fix.** Audit what's actually being sent on each call: full conversation
history with no windowing, full raw tool outputs instead of trimmed
results, duplicated retrieved chunks across turns. See
[prompt-and-context-engineering](../prompt-and-context-engineering/SKILL.md)
for concrete history-management and budgeting techniques — this is
usually higher-leverage than model choice.
3. **Use prompt caching for stable prefixes.** If your provider supports
prompt/context caching, structure calls so the stable part (system
prompt, tool definitions, static reference material) forms a consistent
prefix, and only the per-turn variable content (user message, retrieved
chunks) changes after it. This reduces both cost and latency on cache
hits, often substantially, but the exact discount and minimum cacheable
prefix length are provider- and model-specific — check current
documentation for the model you're using.
4. **Right-size the model per step, not per agent.** A multi-step pipeline
rarely needs the strongest available model at every step:
```
plan step (ambiguous, needs strong reasoning) -> strongest available model
extraction/formatting step (well-specified) -> smaller/faster model
final safety/quality check -> smaller model or rule-based check
```
Validate this split against your eval suite (see
[agent-evaluation-and-guardrails](../agent-evaluation-and-guardrails/SKILL.md))
before committing — a cheaper model may be entirely adequate for a
well-specified step, or may not be, and that's an empirical question,
not an assumption.
5. **Parallelize independent calls instead of serializing them.** If a
task requires several independent tool calls or sub-agent calls with no
data dependency between them (see
[multi-agent-orchestration](../multi-agent-orchestration/SKILL.md)),
issue them concurrently rather than one after another — this reduces
wall-clock latency without changing total token cost.
6. **Stream output for interactive use cases.** For anything a human waits
on synchronously, stream tokens as they're generated rather than
waiting for the full response — this improves perceived latency
significantly even when total generation time is unchanged, and costs
nothing extra.
7. **Batch non-interactive workloads.** For background/bulk processing
(e.g. classifying 10,000 tickets overnight) where no human is waiting
synchronously, use a batch API if your provider offers one — batch
endpoints commonly trade higher latency for meaningfully lower per-token
cost, which is a good trade for offline work.
8. **Cap retrieval and tool-result size deliberately** (see
[rag-pipeline-design](../rag-pipeline-design/SKILL.md)) — retrieving and
injecting more chunks or more tool-result content than the task needs
is a direct, avoidable token cost, not just a relevance-quality issue.
9. **Set a cost/latency budget per task type and alert on regressions.**
Track cost and p50/p95 latency per task type over time; a prompt or
tool change that silently doubles average tool-call count per task
should show up as a tracked regression, not a surprise on the monthly
invoice.
## Best practices
- Treat token usage as a first-class metric alongside quality in your eval
harness — report cost and latency next to pass rate for every prompt/
model change, so a quality improvement's cost isn't invisible.
- Default to the smallest/cheapest model that passes your eval suite for
each pipeline step, and only escalate to a stronger model for steps
where evaluation shows a real quality gap.
- Cache aggressively at the prompt level for stable content, and
separately consider caching full results for identical or near-identical
requests (e.g. the same document re-summarized) where correctness
permits.
- Avoid few-shot examples in every call when a one-time fine-tune, a
cached prefix, or a shorter instruction achieves the same effect for
less recurring cost.
- Review tool schemas and system prompts periodically for unused bulk —
content that made sense during prototyping but no longer earns its token
cost in production.
- Don't chase the last 10% of cost reduction at the expense of reliability
margins (e.g. removing a validation retry to save one call) — a failed
task that needs manual rework costs far more than the tokens it would
have taken to get it right the first time.
## Common pitfalls
- **Symptom:** Per-conversation cost grows steadily over a session's
lifetime even though user requests stay similarly sized.
**Fix:** This is almost always uncontrolled context growth (see
[prompt-and-context-engineering](../prompt-and-context-engineering/SKILL.md))
— audit what's actually in the context at each turn rather than assuming
it's a model-pricing issue.
- **Symptom:** Switching to a cheaper model for a step reduces cost but
increases the retry/failure rate enough that total cost (including
retries) doesn't actually improve, or quality visibly degrades.
**Fix:** Validate any model downgrade against the eval suite including
its retry/failure rate, not just raw per-call price — measure end-to-end
cost and quality together before adopting the change.
- **Symptom:** An interactive chat agent feels slow even though total
token generation time hasn't changed.
**Fix:** Add streaming so the user sees partial output immediately;
perceived latency, not just raw generation time, is what interactive
users experience.
- **Symptom:** A multi-step agent's latency is dominated by several
independent tool calls executed one after another for no data-dependency
reason.
**Fix:** Identify which calls are genuinely independent and parallelize
them; this is a wall-clock latency fix (not a cost fix) that requires no
model or prompt change.
- **Symptom:** Prompt caching isn't producing the expected savings even
though the system prompt is unchanged between calls.
**Fix:** Check that the cached content is actually first in the prompt
and that nothing before it (e.g. a timestamp, a session id) varies per
call — even a small change earlier in the prefix invalidates the cache
for everything after it in most caching implementations; verify the
minimum cacheable length and current cache-hit behavior against your
provider's documentation, since these details are provider-specific.
## Worked example
**Task:** a document-classification agent processing ~5,000 documents/day
was using the strongest available model for every document and running
fully synchronously, at higher cost and latency than the business need
(next-morning results) required.
Before:
```
model: strongest-tier model for every document
mode: synchronous, one call per document, serialized
avg cost/doc: $X (baseline)
avg latency/doc: ~4s, ~5.5 hours total for 5,000 docs run serially
```
After applying this skill's levers:
```
model: smaller/faster model for the classification step (validated against
eval suite: pass rate within 1.5 points of strongest-tier model on
the labeled eval set for this specific task)
mode: batch API, submitted as one batch job overnight
context: system prompt + label taxonomy cached as a stable prefix;
per-document content is the only variable part
result: total batch cost reduced substantially per the provider's batch
discount; total wall-clock time no longer matters since results
are needed by morning, not synchronously
```
The model downgrade was only adopted after the eval suite (see
[agent-evaluation-and-guardrails](../agent-evaluation-and-guardrails/SKILL.md))
confirmed classification accuracy held within an acceptable margin on this
narrow, well-specified task — the same downgrade was explicitly not applied
to a separate, more ambiguous summarization step in the same pipeline,
which stayed on the stronger model after the eval suite showed a real
quality gap there.
## Cross-references
- [prompt-and-context-engineering](../prompt-and-context-engineering/SKILL.md)
- [rag-pipeline-design](../rag-pipeline-design/SKILL.md)
- [agent-architecture-design](../agent-architecture-design/SKILL.md)
Free to get does not mean free to run. Price labels are not safety ratings. Submit pricing information →
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: Apache-2.0
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Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
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Quality
51/100
Needs review
Trust
60/100
Sandbox only
Audit
69/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"recent_failure_rate": null,
"install_attempts": 0,
"install_success_rate": null,
"risk_blocked": 0,
"setup_required": 0,
"avg_output_quality": null,
"production_outcomes": 0,
"last_outcome_at": null,
"label": "No agent outcome data yet"
},
"auto_install": {
"allowed": false,
"sandbox_required": true,
"reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"best_for": [
"design-creative",
"agent-skill"
],
"known_risks": [
"AI review approval is missing",
"Low GitHub adoption signal",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"GitHub adoption: 38 GitHub stars",
"Stars/forks activity: 38 stars, 18 forks; issue activity unavailable in current metadata",
"Dependency/runtime risk: command execution surface, credential or environment access",
"Permission surface: secrets or environment access, shell or command execution"
]
},
"agent_proven": {
"version": "agent-proven-v1",
"score": 0,
"tier": "unproven",
"label": "Needs first agent run",
"summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
"metrics": {
"totalOutcomes": 0,
"successfulOutcomes": 0,
"failedOutcomes": 0,
"installAttempts": 0,
"installSuccessRate": null,
"successRate": null,
"recentSuccessRate": null,
"recentFailureRate": null,
"riskBlocked": 0,
"setupRequired": 0,
"notRelevant": 0,
"avgOutputQuality": null,
"avgTimeToUsefulMs": null,
"productionOutcomes": 0,
"humanReviewRequired": 0,
"uniqueAgents": 0,
"lastOutcomeAt": null
},
"signals": [],
"penalties": [
"No real agent outcome evidence yet"
]
},
"audit": {
"score": 69,
"risk_level": "needs_review",
"risk_label": "Needs review",
"warnings": [
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Low GitHub adoption signal",
"AI review approval is missing",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"GitHub adoption: 38 GitHub stars",
"Stars/forks activity: 38 stars, 18 forks; issue activity unavailable in current metadata"
]
},
"safety_gate": {
"tier": "blocked",
"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 51,
"label": "Needs review"
},
"supply": {
"track": "Design and creative production",
"scenario": "Design and creative",
"maintenance": "2mo since push",
"risk": "Needs review"
},
"alternative_skills": [
{
"slug": "noorqureshi-ai-llm-dos",
"name": "ai-llm-dos",
"url": "https://www.openagentskill.com/skills/noorqureshi-ai-llm-dos",
"stars": 20,
"install_command": "npx skills add NoorQureshi/SploitAgent --skill ai-llm-dos",
"trust_score": 70,
"audit_score": 73
},
{
"slug": "noorqureshi-ai-jailbreak",
"name": "ai-jailbreak",
"url": "https://www.openagentskill.com/skills/noorqureshi-ai-jailbreak",
"stars": 20,
"install_command": "npx skills add NoorQureshi/SploitAgent --skill ai-jailbreak",
"trust_score": 72,
"audit_score": 74
}
],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"production agents without a repository review",
"Low GitHub adoption signal",
"No OpenAgentSkill engagement data yet",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"AI review approval is missing"
],
"agent_contract": {
"task_input": "Use llm-cost-and-latency-optimization in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 68/100 Manual review",
"Audit: 69/100 Needs review",
"Safety: 25/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "selvarajmurugesan90-llm-cost-and-latency-optimization (llm-cost-and-latency-optimization)",
"install_command": "npx skills add selvarajmurugesan90/ops-engineering-skills --skill llm-cost-and-latency-optimization",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "selvarajmurugesan90-llm-cost-and-latency-optimization",
"task": "Use llm-cost-and-latency-optimization in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/selvarajmurugesan90-llm-cost-and-latency-optimization",
"api": "https://www.openagentskill.com/api/agent/skills/selvarajmurugesan90-llm-cost-and-latency-optimization",
"audit": "https://www.openagentskill.com/skills/selvarajmurugesan90-llm-cost-and-latency-optimization/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=selvarajmurugesan90-llm-cost-and-latency-optimization&task=Use%20llm-cost-and-latency-optimization%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20llm-cost-and-latency-optimization%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20llm-cost-and-latency-optimization%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/selvarajmurugesan90-llm-cost-and-latency-optimization/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/selvarajmurugesan90-llm-cost-and-latency-optimization"
}
}Listing source
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