Observe
Braintrust's production-tracing pillar: every prompt, response, tool call and retrieved context logged from the SDK or its gateway, searchable across millions of logs, with latency, cost and quality scored live and alerted on when they drift.
What it does
- Evaluation and observability
Sources
- Pricing
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Plan names, rates, allowances and overage rates read from braintrust.dev/pricing on 2026-09-19.
- Description
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Official documentation · 19 Sep 2026
Read 2026-09-19: "Full visibility into every agent interaction. Every request traced, every response scored, every regression caught before your customers notice", "Trace every step of every LLM call: the prompt, the response, tool calls, retrieved context, and the final output", and "Use the gateway as your default capture layer, and the SDK for deeper context".
- What it does
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Official documentation · 19 Sep 2026
Tracing, scoring and alerting on production LLM traffic is evaluation-observability; the page claims no other AI function.
- Sold within
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Carried by a Braintrust plan rather than bought on its own: the pricing page's own line under Core platform is "Tracing, evaluation, and storage infrastructure for your AI stack", billed as one "Platform fee" of $0, $249 or Custom. There is no Observe line item.
- Name
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Official documentation · 19 Sep 2026
Braintrust's own Product menu lists three products -- Observe, Evaluate and Discover -- and links each to its own page; this page's heading is "Observe".
- URL
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Official documentation · 19 Sep 2026
The product's own page under braintrust.dev/product/, read in full on 2026-09-19. It is absent from braintrust.dev/sitemap.xml, which lists only the homepage, pricing, legal, careers and content pages -- the pages were found from the vendor's own navigation instead.
- Deployment
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The Enterprise tier's own line: "premium support with on-prem or hosted deployment for high volume or privacy-sensitive data"; the two self-serve plans are hosted.
Also from Braintrust
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Braintrust Platform
Stores production agent traces in its own datastore, turns the patterns it finds there into evaluation datasets, and scores every release against them.
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Loop AI agent
Loop is an AI agent that investigates Braintrust logs, experiments, and datasets.
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Patterns Application
Patterns uses Loop to investigate production traces and record recurring problems and trends.
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Evaluate Platform
Braintrust's offline-evaluation pillar: versioned datasets built from production logs or curated by hand, scorers written as code, as LLM judges or as human review, side-by-side experiments across prompts and models, and CI gates that block a regression before it ships.
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Discover Platform
Braintrust's investigation pillar: it applies a model to a project's own production traces on a schedule, surfaces recurring failure modes as evidence-backed patterns, classifies traffic into topics, and turns a confirmed finding into a regression dataset and scorer.
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