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Best LLM evaluation tool

3 models · updated 2026-06-29

The verdict

Braintrust leads — 1 of 3 models rank Braintrust the top startup.

Not unanimous: Claude picks LangSmith; Gemini picks DeepEval.

Combined ranking

  1. 1
    Braintrust—11 pts
    GPT #1Claude #2Gemini #4· Eval-first workflow with strong experiment tracking and production feedback.
  2. 2
    LangSmith—10 pts
    GPT #2Claude #1Gemini #5· End-to-end tracing plus dataset-driven evals tightly integrated with the LangChain ecosystem.
  3. 3
    Arize Phoenix—6 pts
    GPT #3Claude #3Gemini —· Open-source observability and evals with strong RAG diagnostics.
  4. 4
    DeepEval—6 pts
    GPT —Claude #5Gemini #1· Pytest-native testing framework with a wide range of built-in evaluation metrics.
  5. 5
    Galileo—4 pts
    GPT #4Claude #4Gemini —· Polished enterprise platform for LLM evaluation, monitoring, and guardrails.
  6. 6
    Promptfoo—4 pts
    GPT —Claude —Gemini #2· CLI-first tool ideal for YAML-driven prompt comparison and LLM red-teaming.
  7. 7
    Langfuse—3 pts
    GPT —Claude —Gemini #3· Open-source LLM engineering platform focusing on tracing, debugging, and production evaluation.
  8. 8
    promptfoo—1 pts
    GPT #5Claude —Gemini —· Lightweight CI-friendly eval and red-team tool with broad model support.

By model

ChatGPT

  1. 1.Braintrust
  2. 2.LangSmith
  3. 3.Arize Phoenix
  4. 4.Galileo
  5. 5.promptfoo

Claude

  1. 1.LangSmith
  2. 2.Braintrust
  3. 3.Arize Phoenix
  4. 4.Galileo
  5. 5.DeepEval

Gemini

  1. 1.DeepEval
  2. 2.Promptfoo
  3. 3.Langfuse
  4. 4.Braintrust
  5. 5.LangSmith

Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled continuously