CATCH #2236
DETECTED OCT 21, 2026 23:18 UTC
THE CATCHscore 6/10
EXHIBIT 2236 · URGENT
Oct 21, 2026 23:18 UTC
docs
https://raw.githubusercontent.com/anthropics/claude-code/main/CHANGELOG.md
Claude Code (2.1.307) released, featuring API version updates, improved safety event logging, and numerous fixes including model-not-found errors for 1M context aliases and issues with MCP servers.
✓ VERIFIED — BEAT THE ANNOUNCEMENT BY 25.6H · AUTO-VERIFIED AGAINST ANTHROPIC NEWS
READY TO POST:
anthropic's claude code v2.1.307 is out! api version bump to 2026-10-21, better safety event logging, and fixes for model alias context issues. always good to see those stability improvements.
new claude code update! looks like they fixed some pesky 'model not found' errors with 1m context aliases and improved handling of mcp server connections. handy for devs using self-hosted runners too.
EVIDENCE — the receipts
Claude Code changelog changed: https://raw.githubusercontent.com/anthropics/claude-code/main/CHANGELOG.md
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# Changelog
+## 2.1.307
+- Added `/claude-api api-version` to move Claude API code to API version `2026-10-21`
+- Added the `claude_code.safety_event` OpenTelemetry event for each tool call a permission rule, auto mode, a safety check, a hook or the sandbox stopped, prompted or sent back
+- Fixed requests failing with a model-not-found error when `CLAUDE_CODE_DISABLE_1M_CONTEXT` is set and the model is an alias with the `[1m]` suffix, such as `opus[1m]`
+- Fixed the `prompt-caching-scope` beta header being sent behind custom `ANTHROPIC_BASE_URL` gateways and on Foundry, where it has no effect
+- Fixed MCP servers showing "needs authentication" in `claude -p` on macOS while the login keychain was locked; they now say why, and the next run after an unlock connects without a new sign-in
+- Fixed MCP servers being reported as timed out, and staying failed in headless runs, when a macOS or Linux computer went to sleep while they were connecting
+- Fixed HTTP MCP tool calls being sent twice when the connection closed mid-call; only read-only or idempotent tools are now retried
+- Fixed a turn sometimes starting without an SDK MCP server's latest tools when a background task was running
+- Fixed some "Autocompact is thrashing" errors in turns that read many PDF pages, images or other large tool results
+- Fixed `/autocompact` in cloud sessions going back to the default window after the session restarted
+- Fixed a conversation cleared with `/clear` sometimes coming back when a cloud or self-hosted runner session restarted
+- Fixed `CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS` being ignored in Claude apps gateway sessions
+- Fixed telemetry from Claude Desktop sessions behind a Claude apps gateway being rejected when `OTEL_EXPORTER_OTLP_HEADERS` is set
+- Fixed `/permissions` > Recently denied not showing the denied shell command, and
caught by the 20-minute sweep ·
the live wire · all receipts