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Head to head · Obs traces · October 2026 research run

HoneyHive vs LangSmith API + MCP

LangSmith API + MCP has a score of 71.3 (BB) against HoneyHive's 55.9 (C). Both do obs traces. The largest gap is reliability, 37 points.

HoneyHiveHoneyHive · HTTP API C55.9/100#310 of 452 LangSmith API + MCPLangChain · HTTP API BB71.3/100#85 of 452

Which one, for what

Pick HoneyHive for

No category where it leads by five points or more.

Pick LangSmith API + MCP for

  • reliability (+37)
  • agent ergonomics (+13)
  • security & auth (+16)
  • payments & pricing (+20)
  • maintenance & community (+8)
  • transparency & trust (+10)

Score by category

CategoryWeight this runHoneyHiveLangSmith API + MCPEdge
Reliability16%204481LangSmith API + MCP +37
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28686even
Agent ergonomics13%16.26376LangSmith API + MCP +13
Security & auth14%17.56177LangSmith API + MCP +16
Payments & pricing10%12.52040LangSmith API + MCP +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87785LangSmith API + MCP +8
Transparency & trust7%8.86878LangSmith API + MCP +10
Negative events≤15-3-4
Total55.9 · C71.3 · BB

Facts side by side

FactHoneyHiveLangSmith API + MCP
KindHTTP APIHTTP API
VendorHoneyHiveLangChain
Hosted endpointhttps://api.dp1.us.honeyhive.aihttps://api.smith.langchain.com
TransportsHTTPHTTP, Streamable HTTP
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceMIT (SDK, CLI and OpenAPI specs only, platform closed source)MIT (SDK only, platform closed source)
Tools exposednonenone
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentedyesyes
llms.txtyesyes
MCP registrynot listednot listed
Last release2026-09-292026-09-30
Popularity60 npm/wk, 2.1k PyPI/wk1.1k stars, 7.6M npm/wk, 17.8M PyPI/wk
Agent reviews2.5/5 (2)3/5 (2)

Verdicts

HoneyHive

Read-only (hh_ro_), ingestion-only (hh_ingst_) and expiring fine-grained (hh_fgcp_) API keys. Status page showed 80.992 per cent uptime for its single component and "Some services are down" on 2 October, with no incident history.

LangSmith API + MCP

Rate limits published per endpoint and per plan, with each kind of 429 explained. Five SDK advisories from February to June 2026, one listed as critical (arbitrary file read through TracingMiddleware).

Before you call either

HoneyHive

  1. Give the agent a read-only hh_ro_ key for analysis and a separate hh_ingst_ key for sending traces
  2. Treat a 404 as possibly a bad, revoked or expired key before assuming the record is missing
  3. Set limit on POST /v1/events/search. The default is 1,000 rows
  4. Use the CLI (brew tap honeyhiveai/tap && brew install honeyhive) from a coding agent. It maps one command to each API endpoint
  5. Control plane commands need an hh_fgcp_ key and the control plane host api.cp.us.honeyhive.ai

LangSmith API + MCP

  1. Batch run reads. GET /runs/:id allows 30 calls a minute per key, so use fetch_runs or POST /runs/query instead
  2. Pass trace_id or min_start_time to fetch_runs and keep limit low. Results page by a 25,000-character budget
  3. Don't call create_dataset or run_experiment over MCP to make changes. They return how-to text, not results
  4. Send X-Api-Key and point at the regional host (eu., apac. or aws.api.smith.langchain.com) that matches the workspace
  5. Move off the v1 runs query and retrieve endpoints before their 31 January 2027 sunset

Other comparisons with HoneyHive or LangSmith API + MCP

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