Follow Discord
Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.318 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeReleasesWhat has changed since
What has changed since

An entry is only as true as the day it was written.

Flags move on the server after a release ships. Anthropic's own notes land days later and their documentation later still. Sometimes an entry turns out to be wrong and gets corrected by hand. All of that is recorded against the entry it happened to, and this is the whole of it in the order it happened.

Nothing here replaces an entry. Every line links to the page its release published, still saying what that release said, because a correction is added and dated rather than swapped in.

Events22,549dated, and never edited afterwards
Newestthe last time anything moved
Flag readings moved17,196a reading is one sample, for one account
Documentation arrived5,243a docs edit touched an entry's names
WhenEntryWhat happened
v2.1.251SendMessage Documentation arrivedA small documentation edit on Create custom subagents touched a line naming SendMessage after this was published.
the line in the docs

The second filter applies to subagents running in the background. Apart from `Agent` and `ExitPlanMode`, which follow the first filter's conditions wherever the subagent runs, a background subagent keeps every MCP tool but only these built…
v2.1.251GIT_ALLOW_PROTOCOL Documentation arrivedAnthropic's documentation has since written up GIT_ALLOW_PROTOCOL, on Claude Code changelog.
the line in the docs

* Self-hosted runner: Changed git in lifecycle hooks to ignore hook folders and programs named in the runner's shared git files; local-path and `git://` remotes there now need `GIT_ALLOW_PROTOCOL`
v2.1.248GIT_ALLOW_PROTOCOL Documentation arrivedAnthropic's documentation has since written up GIT_ALLOW_PROTOCOL, on Claude Code changelog.
the line in the docs

* Self-hosted runner: Changed git in lifecycle hooks to ignore hook folders and programs named in the runner's shared git files; local-path and `git://` remotes there now need `GIT_ALLOW_PROTOCOL`
v2.1.259claude mcp remove Documentation arrivedAnthropic's documentation has since written up claude mcp remove, on Claude Code changelog.
the line in the docs

* Fixed an MCP server re-added under the same name after `claude mcp remove` still showing as needing authentication instead of reconnecting
v2.1.206tengu_umber_kestrel Flag reading movedThe flag server now returns on for tengu_umber_kestrel, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"allowanceNote":"{percent} allowance left","budgetExhaustedCopy":"You've used this week's lower-priority allowance","cooloffMinutes":10,"enabled":true,"label":"Continue now at lower priority","noticeLine":"/low-priority to continue now at lower priority · uses your weekly limit","statusLine":"Lower priority until {reset}","version":3,"waitBanner":"Working at lower priority · waiting for capacity"} for tengu_toasty_breeze, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"allowanceNote":"{percent} allowance left","budgetExhaustedCopy":"You've used this week's lower-priority allowance","cooloffMinutes":10,"enabled":true,"label":"Continue now at lower priority","noticeLine":"/low-priority to continue now at lower priority · uses your weekly limit","statusLine":"Lower priority until {reset}","version":3,"waitBanner":"Working at lower priority · waiting for capacity"} for tengu_toasty_breeze, read as this account.
v2.1.187tengu_startup_announcements Flag reading movedThe flag server now returns [{"accentBar":false,"id":"fable-5-1-launch","maxImpressions":5,"priority":0,"requiresModel":"claude-fable-5-1","text":"Fable 5.1 writes better code and reports progress on long tasks. Switch anytime with `/model`."}] for tengu_startup_announcements, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"autoContinue":true,"enabled":true,"label":"Reset your session limit now","noticeLine":"/limit-reset to reset your session limit now · uses weekly limit · 1/week","spentLine":"Weekly reset used · available again {date}","successLine":"Session limit reset · next reset available {date} · your weekly limit still applies","unavailableLine":"Couldn't reset your session limit right now · try again in a moment","version":1} for tengu_nifty_lemur, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"autoContinue":true,"enabled":true,"label":"Reset your session limit now","noticeLine":"/limit-reset to reset your session limit now · uses weekly limit · 1/week","spentLine":"Weekly reset used · available again {date}","successLine":"Session limit reset · next reset available {date} · your weekly limit still applies","unavailableLine":"Couldn't reset your session limit right now · try again in a moment","version":1} for tengu_nifty_lemur, read as this account.
v2.1.232tengu_lapis_anchor Flag reading movedThe flag server now returns "off" for tengu_lapis_anchor, read as this account.
v2.1.223tengu_juniper_relay Flag reading movedThe flag server now returns on for tengu_juniper_relay, read as this account.
v2.1.251tengu_juniper_relay Flag reading movedThe flag server now returns on for tengu_juniper_relay, read as this account.
v2.1.248tengu_ccr_no_subscriber_flush_ms Flag reading movedThe flag server now returns null for tengu_ccr_no_subscriber_flush_ms, read as this account.
v2.1.248tengu_ccr_no_subscriber_flush_ms Flag reading movedThe flag server now returns null for tengu_ccr_no_subscriber_flush_ms, read as this account.
v2.1.187tengu_startup_announcements Flag reading movedThe flag server now returns [{"accentBar":false,"id":"opus-5-5-launch","maxImpressions":3,"priority":0,"requiresModel":"claude-opus-5-5","text":"Get to finished work sooner with Opus 5.5. Switch anytime with `/model`."}] for tengu_startup_announcements, read as this account.
v2.1.232tengu_lapis_anchor Flag reading movedThe flag server now returns "padded-countdown" for tengu_lapis_anchor, read as this account.
v2.1.248tengu_ccr_no_subscriber_flush_ms Flag reading movedThe flag server now returns 2000 for tengu_ccr_no_subscriber_flush_ms, read as this account.
v2.1.248tengu_ccr_no_subscriber_flush_ms Flag reading movedThe flag server now returns 2000 for tengu_ccr_no_subscriber_flush_ms, read as this account.
v2.1.277claude-sonnet-5 Documentation arrivedA small documentation edit on Create custom subagents touched a line naming claude-sonnet-5 after this was published.
the line in the docs

* **Full model ID**: use a full model ID such as `claude-opus-5-5` or `claude-sonnet-5`. Accepts the same values as the `--model` flag
v2.1.242ANTHROPIC_CUSTOM_MODEL_OPTION Documentation arrivedAnthropic's documentation has since written up ANTHROPIC_CUSTOM_MODEL_OPTION, on Model configuration.
the line in the docs

export ANTHROPIC_CUSTOM_MODEL_OPTION="my-gateway/claude-opus-5-5"
v2.1.242alwaysThinkingEnabled Documentation arrivedAnthropic's documentation has since written up alwaysThinkingEnabled, on Model configuration.
the line in the docs

| Set the global default | Run `/config` and toggle thinking mode. Saved as `alwaysThinkingEnabled` in `~/.claude/settings.json` |
v2.1.242MAX_THINKING_TOKENS Documentation arrivedAnthropic's documentation has since written up MAX_THINKING_TOKENS, on Environment variables.
the line in the docs

| `CLAUDE_CODE_DISABLE_THINKING` | Set to `1` to omit the `thinking` parameter from API requests entirely. This is a compatibility option for proxies and gateways that reject the parameter. On models that think by default, omitting the par…
v2.1.242MAX_THINKING_TOKENS Documentation arrivedA small documentation edit on Desktop application touched a line naming MAX_THINKING_TOKENS after this was published.
the line in the docs

[Extended thinking](/docs/en/model-config#extended-thinking) is enabled by default, which improves performance on complex reasoning tasks but uses additional tokens. On the Anthropic API, set `MAX_THINKING_TOKENS` to `0` in the local envir…
v2.1.260/model fable Documentation arrivedAnthropic's documentation has since written up /model fable, on Communications kit.
the line in the docs

| Fable | The hardest, longest-running tasks. Opt-in only: select it with `/model fable`. Cybersecurity or biology content triggers [automatic model fallback to Opus](/docs/en/model-config#automatic-model-fallback) |
v2.1.265/release-notes Documentation arrivedA small documentation edit on overview touched a line naming /release-notes after this was published.
the line in the docs

<Card id="claude-opus-5-5" title="Claude Opus 5.5" icon="file" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-5-5" />
v2.1.246/release-notes Documentation arrivedA small documentation edit on overview touched a line naming /release-notes after this was published.
the line in the docs

<Card id="claude-opus-5-5" title="Claude Opus 5.5" icon="file" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-5-5" />
v2.1.274--model Documentation arrivedA small documentation edit on On a remote host without a browser: touched a line naming --model after this was published.
the line in the docs

--model claude-opus-5-5 \
v2.1.259unpin Documentation arrivedAnthropic's documentation has since written up unpin, on mcp-connector.
the line in the docs

The following example sends one request with an unpinned toolset, copies the returned list into the toolset's `tools` field, and sends the request again. The second response has no `mcp_tool_listing` block, because the API doesn't ask the …
v2.1.275insert Documentation arrivedAnthropic's documentation has since written up insert, on optimizing-for-cost-and-intelligence.
the line in the docs

Anthropic measured the triage job from [Trim input and context tokens](https://platform.claude.com/docs/en/about-claude/models/optimizing-for-cost-and-intelligence#trim-input-and-context-tokens) with pauses inserted before some turns to si…
v2.1.277claude-opus-5 Documentation arrivedA small documentation edit on model-deprecations touched a line naming claude-opus-5 after this was published.
the line in the docs

| claude-opus-5-5 | Active | N/A | Not sooner than September 22, 2027 |
v2.1.275claude-opus-5 Documentation arrivedA small documentation edit on model-deprecations touched a line naming claude-opus-5 after this was published.
the line in the docs

| claude-opus-5-5 | Active | N/A | Not sooner than September 22, 2027 |
v2.1.274Markdown Documentation arrivedA small documentation edit on Artifacts touched a line naming Markdown after this was published.
the line in the docs

When Claude saves the same filename again in the same session, the artifact gains a new version. You can also edit text-based artifacts (Markdown, code, plain text) directly: click **Edit content**, make changes, and **Save** to create a n…
v2.1.282tengu_violin_speculative_classifier Gate removed from the codev2.1.280 removed the tengu_violin_speculative_classifier gate from the code while it was still reading on for the account this site reads.
v2.1.280tengu_violin_speculative_classifier Gate removed from the codev2.1.280 removed the tengu_violin_speculative_classifier gate from the code while it was still reading on for the account this site reads.
v2.1.267assets Documentation arrivedA small documentation edit on Skills in Claude Desktop touched a line naming assets after this was published.
the line in the docs

**Mind the text-only rule.** A skill delivered through the admin portal can contain only text files, in these formats: `.md`, `.txt`, `.json`, `.yaml`, `.yml`, `.csv`. The skill authoring guide describes scripts and binary assets such as i…
v2.1.275icon Documentation arrivedA small documentation edit on Manage plugins and connectors touched a line naming icon after this was published.
the line in the docs

Apart from the optional icon, everything in an archive must be text in UTF-8. There is no way to ship a script, or any other binary asset such as an image, through the card. File and folder names must be ASCII. Nothing in the archive may s…
v2.1.275icon Documentation arrivedA small documentation edit on Manage plugins and connectors touched a line naming icon after this was published.
the line in the docs

Apart from the optional icon, everything in an archive must be text in UTF-8. There is no way to ship a script, or any other binary asset such as an image, through the card. File and folder names must be ASCII. Nothing in the archive may s…
v2.1.248tengu_violin_pegbox Flag reading movedThe flag server now returns on for tengu_violin_pegbox, read as this account.
v2.1.275statusLine Documentation arrivedA small documentation edit on Customize your status line touched a line naming statusLine after this was published.
the line in the docs

Run `/statusline` and ask it to remove or clear your status line (for example, `/statusline delete`, `/statusline clear`, `/statusline remove it`). You can also manually delete the `statusLine` field from your settings.json.
v2.1.277skillOverrides Documentation arrivedA small documentation edit on Extend Claude with skills touched a line naming skillOverrides after this was published.
the line in the docs

To raise the budget, set the [`skillListingBudgetFraction`](/docs/en/settings-reference#skilllistingbudgetfraction) setting (for example, `0.02` = 2%) or the `SLASH_COMMAND_TOOL_CHAR_BUDGET` environment variable to a fixed character count.…
v2.1.206tengu_umber_kestrel Flag reading movedThe flag server now returns off for tengu_umber_kestrel, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_toasty_breeze, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_toasty_breeze, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_nifty_lemur, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_nifty_lemur, read as this account.
v2.1.223tengu_juniper_relay Flag reading movedThe flag server now returns off for tengu_juniper_relay, read as this account.
v2.1.251tengu_juniper_relay Flag reading movedThe flag server now returns off for tengu_juniper_relay, read as this account.
v2.1.206tengu_umber_kestrel Flag reading movedThe flag server now returns on for tengu_umber_kestrel, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"allowanceNote":"{percent} allowance left","budgetExhaustedCopy":"You've used this week's lower-priority allowance","cooloffMinutes":10,"enabled":true,"label":"Continue now at lower priority","noticeLine":"/low-priority to continue now at lower priority · uses your weekly limit","statusLine":"Lower priority until {reset}","version":3,"waitBanner":"Working at lower priority · waiting for capacity"} for tengu_toasty_breeze, read as this account.
Feedback