AI Agent Observability Cost Calculator
Estimate monthly spend for LLM observability, error tracking, infrastructure APM, and uptime monitoring across popular providers.
Scenario presets
Workload
Estimates are directional. Last updated: 2026-07-07. See notes.
Cheapest provider
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Cost per 1M requests
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Projected period cost
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| Provider | Category | Observations cost | Log/ingest cost | Errors cost | Uptime checks | Seat cost | Monthly |
|---|---|---|---|---|---|---|---|
| Langfuse Cloud | LLM observability | — | — | — | — | — | — |
| Sentry | Error tracking + APM | — | — | — | — | — | — |
| Datadog | Full-stack observability | — | — | — | — | — | — |
| New Relic | Full-stack observability | — | — | — | — | — | — |
| Grafana Cloud | Metrics, logs, traces | — | — | — | — | — | — |
| Honeycomb | Event-driven observability | — | — | — | — | — | — |
| Axiom | Logs + traces | — | — | — | — | — | — |
Verdict
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Frequently asked questions
What counts as an observability 'event' or 'observation' for an AI agent?
In this calculator an observation is roughly one sampled trace/span worth of data per request. LLM-specific observability tools (Langfuse, Honeycomb) price by observations or events; APM tools (Sentry, Datadog) price by spans and errors; log-centric tools price by ingested GB.
How does sampling affect cost?
You rarely need to trace 100% of production traffic. Setting a 10% sample still gives you representative latency and error data while cutting observability volume by 90%. Enter your sample rate to see the impact.
Does this include LLM token cost?
No. This calculator covers observability and monitoring only. Combine it with the API Pricing Comparator or Prompt Cost Forecaster for total agent spend.
Which provider is cheapest?
It depends on what you emit. Honeycomb and Axiom have large free data tiers; Langfuse has a free observability tier for small agents; Sentry is cheap for error tracking but span volume can add up; Datadog and New Relic are powerful but typically the most expensive at scale.
Are these prices exact?
No. Provider pricing changes and depends on commitments, retention, and add-ons. Use these numbers for directional comparison, then confirm with the provider's pricing page.
Prices are directional estimates based on published freemium tiers and list pricing. Actual observability bills vary with sampling, retention, log volume, and negotiated rates. Confirm current pricing with each provider before committing.