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Open Token vs Langfuse
Langfuse is a popular open-source LLM engineering platform for tracing, evals and prompt management, available as a cloud service or self-hosted. Cloud plans start at US$29 per month with unlimited users, and usage is billed per 100,000 units.
Where Open Token is different
A gateway that meters every call: budget alerts and runaway detection as it happens today, with in-path stopping on our roadmap. Langfuse observes but doesn't sit in the request path.
Model cost is measured on every call before any sampling, so sampling does not change those cost numbers. The trace fee counts only stored AI traces, so a trace sampling drops is not billed and does not reduce the bill. In Langfuse, sampling happens in the client and unsent traces disappear from cost views.
Views built for finance: attribution to team, feature and customer, costs reconciled with your AWS invoice, and chargeback with FOCUS exports on Business and Enterprise.
When Langfuse is the better fit
- You want to self-host an open-source tool, or your main need is evals and prompt management.
- You only need observability for a small workload: Langfuse alone is cheaper, without a gateway or budgets.
Using both
Open Token can export traces to Langfuse, so engineers keep their eval workflow while finance and platform teams govern spend.
Gateway with budget alerts
- Open Token
- Yes
- Langfuse
- No
Hard limits that block requests
- Open Token
- Soon
- Langfuse
- No
Per-run monitoring and loop detection alerts
- Open Token
- Yes
- Langfuse
- No
Stopping an agent run in the request path
- Open Token
- Soon
- Langfuse
- No
Costs reconciled with your AWS invoice (CUR)
- Open Token
- Yes
- Langfuse
- No
Sampling that keeps cost exact
- Open Token
- Yes
- Langfuse
- No
OpenTelemetry ingest
- Open Token
- Yes
- Langfuse
- Yes
Runs in your own infrastructure
- Open Token
- Yesyour AWS account, Enterprise
- Langfuse
- Yesself-hosted
Evals, datasets, prompts
- Open Token
- Nointegrates
- Langfuse
- Yes
7 users, 400k calls, 80,000 traces per month
- Open Token
- Partialabout US$401, gateway included
- Langfuse
- Partialabout US$198 with a separate gateway
Based on each vendor's public documentation and pricing as of September 26, 2026. Tell us if something has changed and we'll update it.
Sources: Langfuse pricing · Langfuse sampling
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