# Braintrust: what AI models say (September 2026)

Source: Memetik Index, https://www.memetik.ai/vendors/braintrust
Website: https://www.braintrust.dev

Braintrust was named in 46 of 50 AI answers across 1 category. Best position: LLM observability and evals, 92% answer share, ranked #4, named first in 14%.

## What Braintrust is

Braintrust is a platform for observing and evaluating AI agents. It is built for AI teams across engineering and product. It is free to start and does not require a credit card.

It traces LLM calls, including prompts, responses, tool calls, retrieved context and final outputs. Teams can score production traffic against quality criteria, receive alerts when performance drifts, build datasets, define scorers, run experiments and gate deployments. Its gateway captures requests across multiple AI providers with automatic caching and observability.

Pricing: It is free to start and does not require a credit card.
(From Braintrust's own website, read 2026-09-02.)

## By category

| Category | Rank | Answer share | Named first | Models |
|---|---|---|---|---|
| LLM observability and evals (https://www.memetik.ai/index/llm-observability) | #4 of 13 | 92% | 14% | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini, Gemini 3.5 Flash, Perplexity, Sonar Reasoning Pro |

## What the models said

> "Choose LangSmith if you're deep in LangChain, or Braintrust if rigorous evals in CI/CD matter more than tracing."
> — Claude Fable 5, LLM observability and evals

> "Choose Braintrust if your top priority is evaluation-driven development and CI-style regression testing, rather than broad production observability."
> — GPT-5.6 Luna, LLM observability and evals

> "Choose Braintrust or Confident AI if evaluation quality gates are the main priority."
> — Perplexity, LLM observability and evals

> "Short answer For most AI engineering teams, I’d start with Braintrust."
> — GPT-5.6 Sol, LLM observability and evals