Live tracker
Claude Code releases in September 2026
GitHub lists 27 releases for anthropics/claude-code with published_at in September 2026.
Last verified UTC, from the stored read. GitHub releases.
Key takeaways
- GitHub lists 27 releases for anthropics/claude-code with published_at in September 2026.
- Each note is the first line of that release’s own text. Drafts are omitted.
Releases
GitHub lists 27 releases for anthropics/claude-code with published_at in September 2026. The API page used here returns 100 releases. This month’s rows are the ones inside that page. The date is published_at. The note is the first line of the release text after section labels such as “What’s Changed.” All releases for anthropics/claude-code.
| Version | Published | Note |
|---|---|---|
| v2.1.286 | September 30, 2026 | Added a count such as "2 of 5" to the permission prompt when several permission requests stack up |
| v2.1.285 | September 29, 2026 | Added `CLAUDE_CODE_DISABLE_WEB_FETCH` environment variable to turn off the WebFetch tool |
| v2.1.284 | September 28, 2026 | 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 |
| v2.1.283 | September 25, 2026 | 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` |
| v2.1.282 | September 24, 2026 | Added a `maxProseWidth` setting that caps the width of Claude's prose in wide terminals while tables and code blocks keep the full width |
| v2.1.281 | September 23, 2026 | Added Claude apps gateway support for newer Claude Desktop keys in `desktop` policy blocks, including `blockReadsOutsideWorkingDirectories` and `disableBypassPermissionsMode` |
| v2.1.280 | September 22, 2026 | 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 |
| v2.1.278 | September 19, 2026 | 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. See https://code.claude.com/docs/en/auto-mode-classifier-billing |
| v2.1.277 | September 18, 2026 | 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) |
| v2.1.276 | September 18, 2026 | Fixed every request failing with `400 … Input tag 'advisor_20260301'` when `ANTHROPIC_BASE_URL` points at a proxy or gateway (2.1.275 regression) |
| v2.1.275 | September 17, 2026 | 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 |
| v2.1.274 | September 17, 2026 | Added a visible warning when memory usage is critical, with steps to free memory or restart safely |
| v2.1.273 | September 15, 2026 | 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` |
| v2.1.272 | September 15, 2026 | Bug fixes and reliability improvements |
| v2.1.271 | September 14, 2026 | 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 |
| v2.1.270 | September 12, 2026 | 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) |
| v2.1.269 | September 11, 2026 | Added `claude plugin eval`: run a plugin's eval suite against Claude Code and get scored, reproducible results (JSON + HTML report); see `claude plugin eval --help` |
| v2.1.268 | September 10, 2026 | 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` and telemetry match the spend meter |
| v2.1.267 | September 9, 2026 | 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 pick a lower level |
| v2.1.266 | September 8, 2026 | 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 forcing Cloud-gateway sign-in on its own in 2.1.265, so configurations that set it alongside an API key, `apiKeyHelper`, or custom auth headers failed every request with " |
| v2.1.265 | September 8, 2026 | Added `user.email` and `user.groups` to the telemetry Claude Desktop and Cowork send through a Claude apps gateway, matching terminal sessions |
| v2.1.263 | September 6, 2026 | Bug fixes and reliability improvements |
| v2.1.261 | September 4, 2026 | Added an "Organization policy" line to `/status` and `claude doctor` that says why your organization's policy could not be loaded, such as a proxy not passing the endpoint through |
| v2.1.260 | September 3, 2026 | Added a diff panel that opens beside the conversation in fullscreen mode and shows your uncommitted changes as Claude edits; toggle it with `/diff` |
| v2.1.259 | September 2, 2026 | Added `managedMcpServers` managed setting: organizations can provide HTTP/SSE MCP servers to every user (same entry shape as `.mcp.json`); entries that name a command to run are skipped |
| v2.1.258 | September 1, 2026 | Fixed Claude Code failing to launch on macOS 12 (Monterey), a regression introduced in 2.1.255 |
| v2.1.257 | September 1, 2026 | Added Claude Fable 5.1 (`claude-fable-5-1`), now the default Fable model — 1M context, $10/$50 per Mtok with $0.25/Mtok cache reads |
Last verified UTC from https://api.github.com/repos/anthropics/claude-code/releases?per_page=100&page=1.
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Other months: November 2026, October 2026, August 2026, July 2026.