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.
Events22,646dated, and never edited afterwards
Newestthe last time anything moved
Flag readings moved17,288a reading is one sample, for one account
Documentation arrived5,248a docs edit touched an entry's names
| When | Entry | What happened |
|---|---|---|
v2.1.269tengu_auto_mode_config |
Flag reading movedThe flag server now returns {"editRemovalCap":3000,"editRemovalVisibility":true,"enabled":"enabled","gitStatusType":true,"gitStatusUploads":false,"jsonlTranscript":true,"outcomeVisibility":false,"repoVisibility":true,"sameTurnSiblingContext":true,"severityByModel":{"claude-opus-4-8":{"t1":45,"t2":35},"claude-opus-4-8[1m]":{"t1":45,"t2":35},"claude-sonnet-5":{"t1":25,"t2":35},"claude-sonnet-5[1m]":{"t1":25,"t2":35}},"severityBySite":{"compactFabCheck":"on","handoff":"on","investigator":"on","sandboxNetwork":"on","workflowGate":"on"},"twoStageClassifier":true} for tengu_auto_mode_config, read as this account. | |
v2.1.259tengu_auto_mode_config |
Flag reading movedThe flag server now returns {"editRemovalCap":3000,"editRemovalVisibility":true,"enabled":"enabled","gitStatusType":true,"gitStatusUploads":false,"jsonlTranscript":true,"outcomeVisibility":false,"repoVisibility":true,"sameTurnSiblingContext":true,"severityByModel":{"claude-opus-4-8":{"t1":45,"t2":35},"claude-opus-4-8[1m]":{"t1":45,"t2":35},"claude-sonnet-5":{"t1":25,"t2":35},"claude-sonnet-5[1m]":{"t1":25,"t2":35}},"severityBySite":{"compactFabCheck":"on","handoff":"on","investigator":"on","sandboxNetwork":"on","workflowGate":"on"},"twoStageClassifier":true} for tengu_auto_mode_config, read as this account. | |
v2.1.281tengu_agents_md_mod |
Flag reading movedThe flag server now returns off for tengu_agents_md_mod, read as this account. | |
v2.1.280tengu_agents_md_mod |
Flag reading movedThe flag server now returns off for tengu_agents_md_mod, read as this account. | |
v2.1.277tengu_agents_md_mod |
Flag reading movedThe flag server now returns off for tengu_agents_md_mod, read as this account. | |
v2.1.274tengu_agents_md_mod |
Flag reading movedThe flag server now returns off for tengu_agents_md_mod, read as this account. | |
v2.1.288claude update |
Documentation arrivedAnthropic's documentation has since written up claude update, on Model configuration.
the line in the docsSonnet 5.5 requires Claude Code v2.1.284 or later, and Opus 5.5 requires v2.1.280 or later. If a request for one of them from an older version fails, see [Claude Code does not support this model](/docs/en/errors#claude-code-does-not-suppor… |
|
v2.1.288ANTHROPIC_DEFAULT_SONNET_MODEL |
Documentation arrivedAnthropic's documentation has since written up ANTHROPIC_DEFAULT_SONNET_MODEL, on Model configuration.
the line in the docsWhere `opus` or `sonnet` resolves to an older model, newer models are available by selecting the full model name explicitly or setting `ANTHROPIC_DEFAULT_OPUS_MODEL` or `ANTHROPIC_DEFAULT_SONNET_MODEL`. |
|
v2.1.292/model |
Documentation arrivedA small documentation edit on Explore the context window touched a line naming /model after this was published.
the line in the docsIf you need a larger window rather than a smaller conversation, Fable models, Sonnet 5 and later, Haiku 5.5, Opus 4.6 and later, and Sonnet 4.6 support a 1 million token context window. See [Extended context](/docs/en/model-config#extended… |
|
v2.1.292/model |
Documentation arrivedA small documentation edit on Explore the context window touched a line naming /model after this was published.
the line in the docsIf you need a larger window rather than a smaller conversation, Fable models, Sonnet 5 and later, Haiku 5.5, Opus 4.6 and later, and Sonnet 4.6 support a 1 million token context window. See [Extended context](/docs/en/model-config#extended… |
|
v2.1.292/model |
Documentation arrivedAnthropic's documentation has since written up /model, on Escalate hard decisions with the advisor tool.
the line in the docsFable 5.1 requires Claude Code v2.1.257 or later. Fable models require [Fable access](/docs/en/model-config#work-with-fable). Sonnet 5.5 as the advisor for an Opus 4.7 or Opus 4.8 main model requires Claude Code v2.1.287 or later. Haiku 5.… |
|
v2.1.292/model |
Documentation arrivedAnthropic's documentation has since written up /model, on Escalate hard decisions with the advisor tool.
the line in the docsFable 5.1 requires Claude Code v2.1.257 or later. Fable models require [Fable access](/docs/en/model-config#work-with-fable). Sonnet 5.5 as the advisor for an Opus 4.7 or Opus 4.8 main model requires Claude Code v2.1.287 or later. Haiku 5.… |
|
v2.1.280output_config.effort |
Documentation arrivedA small documentation edit on mid-conversation-system-messages touched a line naming output_config.effort after this was published.
the line in the docsA `role: "system"` message can also carry `output_config.effort` to change the [effort](https://platform.claude.com/docs/en/build-with-claude/effort) level partway through a conversation. This is in beta on Claude Fable 5.1, Claude Mythos … |
|
v2.1.290/effort |
Documentation arrivedAnthropic's documentation has since written up /effort, on claude-on-amazon-bedrock-legacy.
the line in the docsA `role: "system"` message can also set `output_config.effort` to [change effort mid-conversation](https://platform.claude.com/docs/en/build-with-claude/effort#change-effort-mid-conversation-beta) on Claude Fable 5.1 and Claude Opus 5.5. T… |
|
v2.1.288tengu_cobalt_plinth_orpine |
Flag reading movedThe flag server now returns nothing at all, having stopped carrying it for tengu_cobalt_plinth_orpine, read as this account. | |
v2.1.251tengu_bridge_subagent_frames |
Flag reading movedThe flag server now returns off for tengu_bridge_subagent_frames, read as this account. | |
v2.1.288tengu_cobalt_plinth_orpine |
Flag reading movedThe flag server now returns off for tengu_cobalt_plinth_orpine, read as this account. | |
v2.1.251tengu_bridge_subagent_frames |
Flag reading movedThe flag server now returns on for tengu_bridge_subagent_frames, read as this account. | |
v2.1.288tengu_cobalt_plinth_orpine |
Flag reading movedThe flag server now returns nothing at all, having stopped carrying it for tengu_cobalt_plinth_orpine, 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. | |
v2.1.282tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account. | |
v2.1.281tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account. | |
v2.1.281tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account. | |
v2.1.269tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account. | |
v2.1.261tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account. | |
v2.1.261tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account. | |
v2.1.273tengu_quiet_dolphin |
Flag reading movedThe flag server now returns off for tengu_quiet_dolphin, 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. | |
v2.1.284tengu_lantern_wick_text |
Flag reading movedThe flag server now returns null for tengu_lantern_wick_text, 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. | |
v2.1.265tengu_curious_tower_stateless_models |
Flag reading movedThe flag server now returns "fable-5-1, opus-5, opus-4-8" for tengu_curious_tower_stateless_models, read as this account. | |
v2.1.251tengu_bridge_subagent_frames |
Flag reading movedThe flag server now returns off for tengu_bridge_subagent_frames, 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. | |
v2.1.282tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account. | |
v2.1.281tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account. | |
v2.1.281tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account. | |
v2.1.269tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account. | |
v2.1.261tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account. | |
v2.1.261tengu_smooth_chipmunk |
Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account. | |
v2.1.273tengu_quiet_dolphin |
Flag reading movedThe flag server now returns on for tengu_quiet_dolphin, 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. | |
v2.1.284tengu_lantern_wick_text |
Flag reading movedThe flag server now returns "Usage limit reached; a short grace allowance remains, then this turn is cut off without warning. Judge what's left: if it's genuinely only a few steps, finish it properly, then stop and say so without extra polishing. Otherwise don't attempt it all: finish the piece in hand and at most two more like it, then stop. The allowance also pays for any subagents you have running: they don't get this message and will keep going, so it's up to you how to handle them. Either way, end by telling the user their usage limit was reached, what's done and what's left." for tengu_lantern_wick_text, 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. |