Braintrust vs Fireworks AI vs Arize Phoenix
Side by side, from each listing’s own data. A row where every column says the same is shown once, dimmed.
 Braintrustby Braintrust DataRemove Braintrust from this comparison |  Fireworks AIby Fireworks AIRemove Fireworks AI from this comparison |  Arize Phoenixby Arize AIRemove Arize Phoenix from this comparison | |
|---|---|---|---|
| Sets it apart |
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| What it is | Evaluates and observes LLM applications end to end: capture traces, score them with evals, iterate in a prompt playground, and gate deploys on eval results run from CI. | Production inference platform for open models with fast function calling, structured output, and fine-tuning behind an OpenAI-compatible API. | Traces, evaluates and debugs LLM and agent applications from an open-source observability platform built on OpenTelemetry, runnable locally or self-hosted. |
| Provider | Braintrust Data | Fireworks AI | Arize AI |
| Official vendor | Not an official listing | Fireworks AI | Arize AI |
| Verified | YesSame for all | ||
| Access | API, MCP, CLI | API | API, CLI |
| Auth | Bearer Token | API Key | None |
| MCP server | In its setup guide | No MCP server | No MCP server |
| CLI install | In its docs | No CLI | pippip install arize-phoenix |
| API base URL | In its docs | https://api.fireworks.ai/inference/v1 | In its docs |
| Skills | Experiment Based Evals, Production Trace Logging, Prompt Playground, Human Review And Datasets, Braintrust CLI | None listed | OpenTelemetry Tracing, Evaluation Runs, Prompt Experiments |
| Streaming | No | Yes | No |
| Push notifications | NoSame for all | ||
| Categories | Infrastructure & Ops, Code & DevTools | Language & Translation, Infrastructure & Ops | Data & Analytics, Infrastructure & Ops |
| Tags | eval-driven-development, prompt-playground, trace-logging, human-review, llm-proxy, scorers, dataset-management, ci-eval-gates | inference, function-calling, structured-output, open-models | llm-tracing, opentelemetry, span-inspection, prompt-experiments, self-hosted, eval-runner |
| Listed since | Aug 1, 2026 | Aug 11, 2026 | Jul 25, 2026 |
| Use it now | |||
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