generated: '2026-10-07'
method: searched
source: https://s1.dev/docs/changelog (Compatibility promise); https://s1.dev/docs/advanced/reasoning; https://status.search1api.com/
versioning:
  scheme: unversioned-additive
  mechanism: No version number in URLs or headers; the HTTP contract only grows. New endpoints, optional request
    fields, response fields, enum values and headers may appear without notice; unknown request fields are ignored;
    existing fields are never renamed, retyped or moved.
  docs: https://s1.dev/docs/changelog
  notes: SDKs, CLI and MCP server follow semantic versioning and are listed on the same changelog page.
deprecation:
  policy_url: https://s1.dev/docs/changelog
  changelog: https://s1.dev/docs/changelog
  mechanism: Removals are announced on the changelog before they ship; a removed endpoint keeps answering 410 Gone
    with a message naming its replacement.
  sunset_header: false
  deprecation_header: false
  notes: Status-code semantics are part of the contract and changes are dated on the changelog (e.g. zero-result
    searches moved from 404 to 200).
status_page: https://status.search1api.com/
status_page_platform: Better Stack (markup on the page)
sla:
  url: null
  public_uptime_target: null
  notes: No numeric uptime SLA found; the terms page links the status page.
rate_limits: https://s1.dev/docs/essentials/credits-and-limits
deprecated_operations:
- path: POST /v1/chat/completions
  status: discontinued
  response: 410 Gone
  evidence: https://s1.dev/docs/advanced/reasoning
- path: GET /v1/models
  status: discontinued
  response: 410 Gone
  evidence: https://s1.dev/docs/utility/models
removed_parameters:
- change: 'search_service: "sogou" removed from POST /search (422 on use)'
  date: '2026-09-13'
- change: POST /ask sources, time_range, max_results removed (accepted and ignored)
  date: '2026-10-07'
notes: 'The OpenAPI document carries no deprecated: true flags; the two discontinued endpoints were removed from
  the contract rather than marked.'