2026-11-06: API 1.40

Research and search are removed from the API, the SDKs, the CLI and the MCP server.

#Removed

• api: Breaking: POST /v1/research, GET /v1/research, POST /v1/research/estimate, GET /v1/research/{id}, POST /v1/research/{id}/cancel and POST /v1/search answer 410 with the error code feature_removed. They will not come back. They were never generally available, so they were removed without a deprecation period.
• api: The research.succeeded, research.failed and research.canceled events, the research_* and search_engines_exhausted error codes, the research_id filter of GET /v1/jobs and group_by=research on usage are gone.
• mcp: The research, get_research and search tools are gone.
• sdks: The research and search methods and types are gone from the TypeScript, Python and Go SDKs, and kaab research and kaab search from the CLI.

#Added

• api: The error code feature_removed (410, not retryable), with details.docs_url pointing to this entry.