Claude Code 2.1.280

UpdateSep 22, 2026VerifiedAdded Sep 22, 2026

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...

LLMs MCP Security Pricing Observability

Read Anthropic's release notes

https://github.com/anthropics/claude-code/releases/tag/v2.1.280

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More Claude Code releases

Claude CodeSep 23, 2026

Claude Code 2.1.281

What's changed Added Claude apps gateway support for newer Claude Desktop keys in desktop policy blocks, including blockReadsOutsideWorkingDirectories and disableBypassPermissionsMode Added assume_role on Claude apps gateway Bedrock upstreams: the gateway calls Bedrock as an IAM role it assumes through STS, in another AWS account if needed, optionally one...

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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 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...

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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 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 17, 2026

Claude Code 2.1.274

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...

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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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Also shipped on Sep 22, 2026

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GitHub GitHub Advanced SecuritySep 22, 2026

Deprecation notice: All-platform CodeQL bundle

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GitHub GitHub platformSep 22, 2026

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