generated: '2026-08-27'
method: searched
source: https://docs.anthropic.com/en/api/versioning, https://platform.claude.com/docs/en/release-notes/api
versioning:
  scheme: date-header
  header: anthropic-version
  current: '2023-06-01'
  docs: https://docs.anthropic.com/en/api/versioning
  notes: The API is versioned by a required anthropic-version request header (e.g. 2023-06-01). Non-breaking
    additions ship without a version bump; the error type and other enum values may expand over time.
beta_headers:
  header: anthropic-beta
  docs: https://docs.anthropic.com/en/api/beta-headers
  notes: Opt into pre-GA features with dated beta identifiers (e.g. skills-2025-10-02, managed-agents-2026-04-01,
    agent-memory-2026-07-22, output-300k-2026-03-24, mcp-tunnels-2026-06-22).
deprecation:
  policy_url: https://platform.claude.com/docs/en/about-claude/model-deprecations
  sunset_header: false
  notes: Model deprecations are announced in release notes with a dated retirement. Retired models return
    an error. No RFC 8594 Sunset/Deprecation HTTP headers.
  recent_retirements:
  - model: claude-opus-4-1-20250805
    retired: '2026-08-05'
    note: All requests now return an error. Researchers can request ongoing access through the External
      Researcher Access Program.
  - model: claude-sonnet-4-20250514
    retired: '2026-06-15'
  - model: claude-opus-4-20250514
    retired: '2026-06-15'
  recent_deprecations:
  - model: claude-opus-4-1-20250805
    retirement: '2026-08-05'
  - feature: fast-mode (Claude Opus 4.7)
    removal: '2026-07-24'
  recent_feature_removals:
  - feature: fast mode on Claude Opus 4.7
    removed: '2026-07-24'
    note: speed:"fast" now returns an error with NO fallback to standard speed (unlike Opus 4.6, which
      fell back silently). Migrate to Opus 5 or Opus 4.8.
  - feature: fast mode on Claude Opus 4.6
    removed: '2026-06-29'
    note: Requests run at standard speed and rates; no error.
  - feature: Text Completions API, and temperature/top_p/top_k on Messages methods (Python SDK)
    removed: '2026-08-20'
    note: Removed in Python SDK v1.0. SDK-level removal of long-deprecated surface.
  beta_graduations:
  - feature: Files API
    ga: '2026-08-19'
    note: files-api-2025-04-14 header no longer required; requests without it get the new response format.
  - feature: Agent Skills / Skills API (/v1/skills)
    ga: '2026-08-19'
    note: skills-2025-10-02 header no longer required.
  - feature: Computer use tool
    ga: '2026-08-19'
    note: Now the computer_toolset_20260801 toolset; upgrading changes the request shape.
  - feature: Admin API Claude Enterprise user management
    ga: '2026-08-19'
  - feature: Compliance API session endpoints (Cowork, Claude Code)
    ga: '2026-08-26'
  pattern_note: Anthropic's deprecation mechanism is MODEL RETIREMENT, not endpoint sunset. A retired
    model id returns an error; endpoints themselves are stable behind the anthropic-version date header.
    There are no RFC 8594 Sunset or Deprecation HTTP headers, so a client cannot detect an impending retirement
    from a response — it has to read the release notes. That is the single largest lifecycle gap on this
    API.
sla:
  url: https://trust.anthropic.com/
  notes: Enterprise agreements carry availability commitments; no public numeric uptime SLA published
    on the developer docs.
status_page: https://status.anthropic.com/
data_retention:
  docs: https://docs.anthropic.com/en/manage-claude/api-and-data-retention
  notes: Zero Data Retention (ZDR) available for eligible orgs; some frontier models (e.g. Claude Fable
    5) require 30-day retention and are not available under ZDR.
deprecated_operations: []
console_note: Workbench was renamed Playground on 2026-08-18; see sandbox/anthropic-sandbox.yml.