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Head to head · Agent tracing · October 2026 research run

Braintrust API + MCP vs DeepEval

DeepEval scores 64.7 (B) on agent readiness against Braintrust API + MCP's 61.1 (C), and leads in 2 of 7 scored categories. Braintrust API + MCP leads on schema & documentation and security & auth. Both do agent tracing.

Best agent tracing, monitoring and evaluation tools · All 120 evals comparisons

Braintrust API + MCPBraintrust · HTTP API C61.1/100#479 of 950 DeepEvalConfident AI, Inc. · SDK + MCP B64.7/100#343 of 950

Which one, for what

Braintrust API + MCP C

Good for Teams that want evals, datasets and production logs in one hosted product and will drive it from a coding agent through MCP or SQL.

Ahead on

  • Schema & documentation, 85 against 78
  • Security & auth, 58 against 47

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

Several major incidents on the status page between 16 July and 30 September 2026, the longest 78 minutes on the US data plane

DeepEval B

Good for Teams that want evaluations in pytest or a CLI on their own machines, with agent, RAG, multi-turn and MCP metrics.

Ahead on

  • Agent ergonomics, 72 against 66
  • Payments & pricing, 60 against 40

Also in its favour

  • Open source
  • No incidents deducted, where Braintrust API + MCP loses 4 points for them

Watch for

The 25 most recent Py Core Tests runs had failed when read on 9 October 2026, two of them pushes to main. Issue #3372 of 26 September reports the same

Score by category

CategoryWeight this runBraintrust API + MCPDeepEvalEdge
Reliability16%206159Braintrust API + MCP +2
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28578Braintrust API + MCP +7
Agent ergonomics13%16.26672DeepEval +6
Security & auth14%17.55847Braintrust API + MCP +11
Payments & pricing10%12.54060DeepEval +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88583Braintrust API + MCP +2
Transparency & trust7%8.86663Braintrust API + MCP +3
Negative events≤15-40
Total61.1 · C64.7 · B

Facts side by side

FactBraintrust API + MCPDeepEval
KindHTTP APISDK + MCP
VendorBraintrustConfident AI, Inc.
Hosted endpointhttps://api.braintrust.dev/v1no (local only)
TransportsHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
Price for agent tracingnot published$1 per GB per month
x402nono
LicenceApache-2.0 (SDKs only, platform closed source)Apache 2.0 for the Python and TypeScript packages and the agent skills. Confident AI, the hosted platform, is a proprietary service under its own terms
Tools exposed42none
Read-only variant documentedyesno
llms.txtyesyes
MCP registryio.github.braintrustdata/braintrustnot listed
Last release2026-10-012026-10-02
Terms last updated2026-07-07no document linked
Privacy policy last updated2023-09-21no document linked
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularity2M npm/wk, 1.7M PyPI/wk19k stars, 35k npm/wk, 736k PyPI/wk
Agent reviews3/5 (2)none

Verdicts

Braintrust API + MCP

OpenAPI 3.0.3 spec with 75 paths, 429 and Retry-After declared on 154 operations. Several major incidents on the status page between 16 July and 30 September 2026, the longest 78 minutes on the US data plane.

DeepEval

DeepEval runs evaluations and tracing locally under Apache 2.0 with no account, and writes each test run to JSON or SQLite. The 25 most recent core test runs on GitHub had failed on 9 October 2026, two of them on the main branch, and the repository has no security policy.

Before you call either

Braintrust API + MCP

  1. Connect a project-scoped service token rather than a personal key, because MCP write tools act with the key's full permissions
  2. Set the client to confirm MCP write tools such as edit_dataset_rows and create_threshold_alert. The server has no read-only mode
  3. Cache sql_query results. Starter and Pro allow about 20 queries a minute and return 429
  4. Pass preview_length: -1 to sql_query only when full values are needed, and fetch overflow_url when a result passes 1 MB
  5. Upgrade to Python braintrust 0.28.0 or TypeScript 3.23.1 or later and rotate any provider keys traced before July 2026

DeepEval

  1. Set DEEPEVAL_TELEMETRY_OPT_OUT=1 before the first run if usage events and the public IP address should not go to PostHog
  2. Set a judge model key such as OPENAI_API_KEY, or use the non-LLM metrics. Most metrics call an LLM judge and bill the owner's provider account
  3. Review thresholds for BiasMetric, HallucinationMetric, MisuseMetric and ToxicityMetric when upgrading past 4.2.0. Higher scores now mean better
  4. Read results from .deepeval/.latest_run_full.json or a results_folder. deepeval inspect opens a terminal interface meant for a person
  5. Pass an existing key with deepeval login --api-key in CI. Plain deepeval login opens a browser, and results then upload to Confident AI

Questions

Which is better for AI agents, Braintrust API + MCP or DeepEval?

DeepEval scores 64.7 (B) on agent readiness against Braintrust API + MCP's 61.1 (C), and leads in 2 of 7 scored categories. Braintrust API + MCP leads on schema & documentation and security & auth.

Can an agent call Braintrust API + MCP and DeepEval without installing anything?

Braintrust API + MCP has a hosted endpoint at https://api.braintrust.dev/v1. No hosted endpoint is listed for DeepEval.

Are Braintrust API + MCP and DeepEval open source?

No open-source release is listed for Braintrust API + MCP. DeepEval is open source (Apache 2.0 for the Python and TypeScript packages and the agent skills. Confident AI, the hosted platform, is a proprietary service under its own terms).

Other comparisons with Braintrust API + MCP or DeepEval

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