Claude Code 2.1.274

UpdateSep 17, 2026VerifiedAdded Sep 22, 2026

What's changed Added a visible warning when memory usage is critical, with steps to free memory or restart safely Added CLAUDE_CODE_MCP_STARTUP_WAIT_MS to bound how long the first non-interactive turn waits for connecting MCP servers ( 0 = don't wait) Added effort attribute to the claude_code.llm_request OpenTelemetry trace span, matching the api_request...

AI agents LLMs MCP Streaming Governance

Read Anthropic's release notes

https://github.com/anthropics/claude-code/releases/tag/v2.1.274

Summaries of vendors' own notes. Product names and logos belong to their owners; logos via logo.dev.

More Claude Code releases

Claude CodeSep 17, 2026

Claude Code 2.1.275

What's changed Added the signed-in account to Claude apps gateway sign-in: when the gateway names it, you confirm it before the credential is saved, and /status shows it Added a send-now key (ctrl+enter, or ctrl+x ctrl+s) that interrupts the current turn and sends all queued messages at once; sent and queued messages show in gray until the model receives...

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Claude CodeSep 18, 2026

Claude Code 2.1.277

What's changed Added AGENTS.md support: in a project with no CLAUDE.md, Claude Code reads AGENTS.md instead; change it under "Project instructions" in /config (not yet on Bedrock, Vertex or Foundry) Added CLAUDE_GATEWAY_PROXY_IS_EGRESS_BOUNDARY=1 for Claude apps gateways whose only egress is a forward proxy: every outbound request hands the proxy the...

UpdateAI agentsLLMsStreamingSource

Claude CodeSep 18, 2026

Claude Code 2.1.276

What's changed Fixed every request failing with 400 … Input tag 'advisor_20260301' when ANTHROPIC_BASE_URL points at a proxy or gateway (2.1.275 regression)

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Claude CodeSep 19, 2026

Claude Code 2.1.278

What's changed Changed auto mode for Claude API and Enterprise users, and on Bedrock, Vertex, Foundry and gateways, to default to the server-side classifier, which does not charge for classifier overhead ( CLAUDE_CODE_AUTO_MODE_SERVER=0 opts out on Bedrock, Vertex, Foundry and gateways); warns on billed fallback.

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Claude CodeSep 15, 2026

Claude Code 2.1.273

What's changed Added x-claude-code-request-class , x-claude-code-agent-type , x-claude-code-prev-tool-durations , x-claude-code-compaction and x-claude-code-context-compacted request headers for LLM gateways; opt in with CLAUDE_CODE_GATEWAY_HINT_HEADERS=1 Added a notification when an MCP server disconnects mid-session and automatic reconnection gives up...

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Claude CodeSep 15, 2026

Claude Code 2.1.272

What's changed Bug fixes and reliability improvements

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Claude CodeSep 14, 2026

Claude Code 2.1.271

What's changed Added fast mode in Claude Code Remote sessions (cloud and self-hosted runners): the host's fast-mode setting or /fast typed in the session applies where your organization allows it Added mouse support to the /config panel in fullscreen mode: the wheel scrolls the settings list, a click on a setting's value changes it, and the row under the...

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Claude CodeSep 22, 2026

Claude Code 2.1.280

What's changed Added Claude Opus 5.5 ( claude-opus-5-5 ), now the default Opus model , 1M context, $4/$20 per Mtok with $0.20/Mtok cache reads Added mouse support to more lists in fullscreen mode: the wheel scrolls the /skills list, and a skill's state options in /plugin can be clicked Added CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH to change the...

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