specification: API Commons Rate Limits
specificationVersion: '0.1'
schema: https://raw.githubusercontent.com/api-evangelist/interface-research/main/schema/api-commons.yml#/$defs/RateLimits
provider: LangSmith
providerId: langsmith
created: '2026-05-08'
# Provenance stamped 2026-08-11: this artifact was written by the API Evangelist
# bulk sweep dated 2026-05-08, not harvested from the provider. See roadmap#35.
method: generated
modified: '2026-05-08'
reconciled: false
tags:
- AI
- LLM
- Observability
- Evaluations
- LangChain
- Rate Limiting
- Quotas
- Throttling
description: LangSmith does not publish per-endpoint request-rate limits in its public docs;
  the primary throttling surface is monthly base-trace and Fleet-run quotas defined on each
  plan. Enterprise contracts negotiate custom limits.
notes: Tracing/ingest endpoints are designed for high-throughput trace upload; quota enforcement
  is monthly rather than per-second. Update this artifact if LangChain publishes an explicit
  rate-limit schedule.
sources:
- https://www.langchain.com/pricing
- https://docs.langchain.com/langsmith
responseCodes:
  throttled: 429
limits:
- name: Developer Monthly Base Traces
  scope: account
  metric: trace
  limit: 5000
  timeFrame: monthly
  notes: Hard cap on free tier base traces; overage requires upgrading to a paid plan.
- name: Plus Monthly Base Traces (Included)
  scope: account
  metric: trace
  limit: 10000
  timeFrame: monthly
  notes: Included allowance; additional traces billed at $2.50 per 1,000.
- name: Developer Fleet Runs
  scope: account
  metric: run
  limit: 50
  timeFrame: monthly
  notes: Maximum monthly Fleet agent runs on the Developer plan.
- name: Plus Fleet Runs (Included)
  scope: account
  metric: run
  limit: 500
  timeFrame: monthly
  notes: Included Fleet agent run allowance on the Plus plan.
- name: Enterprise Custom Limits
  scope: account
  metric: varies
  limit: contract
  notes: Enterprise customers negotiate custom trace, run, and rate-limit ceilings.
policies:
- name: Backoff Strategy
  description: Clients should implement exponential backoff with jitter and honor any Retry-After
    header.
- name: Trace Batching
  description: SDKs batch trace events client-side before flushing to the ingest endpoint to
    minimize per-request overhead.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com