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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
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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
v2.1.269claude-opus-4-5 Documentation arrivedA small documentation edit on overview touched a line naming claude-opus-4-5 after this was published.
the line in the docs

<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-5">
v2.1.267assets Documentation arrivedAnthropic's documentation has since written up assets, on environments.
the line in the docs

| Code hosting | `github.com`, `api.github.com`, `codeload.github.com`, `raw.githubusercontent.com`, `objects.githubusercontent.com`, `release-assets.githubusercontent.com`, `gitlab.com`, `bitbucket.org` |
v2.1.281/app Documentation arrivedA small documentation edit on compliance-errors touched a line naming /app after this was published.
the line in the docs

**Fix:** Use `GET /v1/compliance/apps/projects/{project_id}/attachments` to list current attachments. If the document is missing, it was deleted; retrieve it through a `claude_project_document_uploaded` activity record if you only need the…
v2.1.280/usage Documentation arrivedA small documentation edit on First request touched a line naming /usage after this was published.
the line in the docs

For complete parameter details and response schemas, see the [Claude Code Analytics API reference](https://platform.claude.com/docs/en/api/beta/organization/usage_report/retrieve_claude_code).
v2.1.277/usage Documentation arrivedA small documentation edit on First request touched a line naming /usage after this was published.
the line in the docs

For complete parameter details and response schemas, see the [Claude Code Analytics API reference](https://platform.claude.com/docs/en/api/beta/organization/usage_report/retrieve_claude_code).
v2.1.273/usage Documentation arrivedA small documentation edit on First request touched a line naming /usage after this was published.
the line in the docs

For complete parameter details and response schemas, see the [Claude Code Analytics API reference](https://platform.claude.com/docs/en/api/beta/organization/usage_report/retrieve_claude_code).
v2.1.273/usage Documentation arrivedA small documentation edit on First request touched a line naming /usage after this was published.
the line in the docs

For complete parameter details and response schemas, see the [Claude Code Analytics API reference](https://platform.claude.com/docs/en/api/beta/organization/usage_report/retrieve_claude_code).
v2.1.281claude-opus-5-5 Documentation arrivedA small documentation edit on For Amazon Bedrock support touched a line naming claude-opus-5-5 after this was published.
the line in the docs

model="claude-opus-5-5",
v2.1.281claude-opus-5-5 Documentation arrivedA small documentation edit on For Amazon Bedrock support touched a line naming claude-opus-5-5 after this was published.
the line in the docs

model="claude-opus-5-5",
v2.1.281claude-opus-5-5 Documentation arrivedA small documentation edit on For Amazon Bedrock support touched a line naming claude-opus-5-5 after this was published.
the line in the docs

model="claude-opus-5-5",
v2.1.280trigger Documentation arrivedA small documentation edit on prompting-claude-fable-5 touched a line naming trigger after this was published.
the line in the docs

* **Don't instruct Claude to reproduce its reasoning in the response.** Prompts, skills, or harness instructions that tell the model to echo, transcribe, or explain its internal reasoning as response text can trigger the [`reasoning_extrac…
v2.1.281/batch Documentation arrivedAnthropic's documentation has since written up /batch, on Message Batches API.
the line in the docs

The Message Batch's `processing_status` field indicates the stage of processing the batch is in. It starts as `in_progress`, then updates to `ended` once all the requests in the batch have finished processing, and results are ready. You ca…
v2.1.277initiator Documentation arrivedAnthropic's documentation has since written up initiator, on Compliance API.
the line in the docs

The user who initiated an agent-owned session (for example, by mentioning Claude in Slack or via a scheduled trigger). Null for user-owned sessions — where the session's `user` started it — and for agent sessions with no human initiator. F…
v2.1.248passthrough Documentation arrivedAnthropic's documentation has since written up passthrough, on User Profiles.
the line in the docs

How the platform uses the API for this entity. `application` (default): the profile represents an individual end-user of the platform's product. `passthrough`: the profile identifies a company the platform resells Claude access to.
v2.1.281attribution Documentation arrivedA small documentation edit on Chat Projects touched a line naming attribution after this was published.
the line in the docs

User who created the project. Null if the project was deleted before attribution was recorded, or if the creator's account no longer exists.
v2.1.281claude-opus-5-5 Documentation arrivedAnthropic's documentation has since written up claude-opus-5-5, on Update Agent.
the line in the docs

- `BetaManagedAgentsModel = string or "claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
v2.1.281claude-opus-5-5 Documentation arrivedAnthropic's documentation has since written up claude-opus-5-5, on Update Agent.
the line in the docs

- `BetaManagedAgentsModel = string or "claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
v2.1.281claude-opus-5-5 Documentation arrivedAnthropic's documentation has since written up claude-opus-5-5, on Update Agent.
the line in the docs

- `BetaManagedAgentsModel = string or "claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
v2.1.282tengu_violin_soundpost Flag reading movedThe flag server now returns on for tengu_violin_soundpost, read as this account.
v2.1.282tengu_violin_soundpost Flag reading movedThe flag server now returns on for tengu_violin_soundpost, read as this account.
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.
v2.1.221tengu_mcp_protocol_negotiation_stdio Flag reading movedThe flag server now returns on for tengu_mcp_protocol_negotiation_stdio, read as this account.
v2.1.221tengu_mcp_protocol_negotiation_stdio Flag reading movedThe flag server now returns on for tengu_mcp_protocol_negotiation_stdio, read as this account.
v2.1.274tengu_mcp_protocol_negotiation_stdio Flag reading movedThe flag server now returns on for tengu_mcp_protocol_negotiation_stdio, 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.
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.
v2.1.248tengu_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.
v2.1.223tengu_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.
v2.1.206tengu_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.
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.
v2.1.248tengu_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.
v2.1.223tengu_juniper_relay Flag reading movedThe flag server now returns on for tengu_juniper_relay, read as this account.
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