Claude Code release notes

Claude Code 2.1.285

Added CLAUDE_CODE_DISABLE_WEB_FETCH environment variable to turn off the WebFetch tool · Added claude --desktop to open the Claude desktop app on the current directory,…

Claude Code 2.1.284

Added Claude Sonnet 5.5 (claude-sonnet-5-5), now the default Sonnet model on the Anthropic API — 1M context, $2/$10 per Mtok with $0.20/Mtok cache reads…

Claude Code 2.1.283

Added x-claude-code-prompt-id to the gateway hint headers so LLM gateways can group the requests that serve one user prompt; opt in with CLAUDE_CODE_GATEWAY_HINT_HEADERS=1 ·…

Claude Code 2.1.282

Added a maxProseWidth setting that caps the width of Claude's prose in wide terminals while tables and code blocks keep the full width ·…

Claude Code 2.1.281

Added Claude apps gateway support for newer Claude Desktop keys in desktop policy blocks, including blockReadsOutsideWorkingDirectories and disableBypassPermissionsMode · Added assume_role on Claude apps…

Claude Code 2.1.280

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…

Claude Code 2.1.278

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…

Claude Code 2.1.277

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…

Claude Code 2.1.276

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

Claude Code 2.1.275

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…

Claude Code 2.1.274

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…

Claude Code 2.1.273

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 2.1.272

Claude Code 2.1.271

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…

Claude Code 2.1.270

Fixed read-only git commands in Bash unexpectedly asking for permission after a session had been running for a while (regression in 2.1.269)

Claude Code 2.1.269

Added claude plugin eval: run a plugin's eval suite against Claude Code and get scored, reproducible results (JSON + HTML report); see claude plugin…

Claude Code 2.1.268

Added to the Claude apps gateway: with pricing: set in gateway.yaml, signed-in Claude Code clients receive the same rates through managed settings, so /cost…

Claude Code 2.1.267

Added maxEffortLevel setting (top-level or per model under modelSettings): caps the effort level on every provider, including Bedrock, Vertex and Foundry; users can still…

Claude Code 2.1.266

Fixed a 2.1.265 regression affecting LLM-gateway and proxy setups: the undocumented CLAUDE_CODE_USE_GATEWAY environment variable, previously ignored unless ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN were both set, began…

Claude Code 2.1.265

Added user.email and user.groups to the telemetry Claude Desktop and Cowork send through a Claude apps gateway, matching terminal sessions · Added support for…