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LLM Observability Cost Comparison

Enter one workload — requests per month, spans per request, KB per trace and scores. The table prices it on Langfuse Core and Pro (billed by units, i.e. event count) and Braintrust Starter and Pro (billed by GB processed), plus LangSmith and Helicone plan prices for reference. The cheaper option flips with trace size. Estimates only; provider pricing pages prevail.

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OptionMonthly$ / 1k requestsNote

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Langfuse bills by units (event count: traces + observations + scores, 100k included, then $8→$6 per 100k graduated) while Braintrust bills by GB processed ($4 Starter / $3 Pro per GB) plus scores — so the cheaper option flips with trace size. LangSmith (Developer $0 with 5k base traces, Plus $39/seat with 10k) and Helicone (Hobby free 10k requests / 1 GB, Pro $79, Team $799) are shown as plan prices only because their usage overage is not published as a fixed rate. Retention: Langfuse Core 90 days / Pro 3 years; Braintrust Starter 14 / Pro 30 days.

Estimates only. Official list prices as of 2026-11-02 (Asia/Shanghai); the provider's pricing page prevails. Sources: Langfuse pricing · Braintrust pricing · LangSmith pricing · Helicone pricing

Langfuse Cost Calculator · Braintrust Cost Calculator · LLM API 비용 계산기 · AI Agent Cost Calculator · RAG Cost Calculator · LLM Prompt Caching Cost Calculator

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