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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
One change · api

Messages changed

api/beta/messages

Nearest release: v2.1.272, published 5 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Recorded here
Lines+1,105added
Lines−1,085removed
From line 3,908 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits13to this page, all time

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from line 3908, old and new numbered
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from line 3908
39083908 
39093909- `temperature: optional number`
39103910 
3911 **Deprecated**: Deprecated. Models released after Claude Opus 4.6 do not support setting temperature. A value of 1.0 of will be accepted for backwards compatibility, all other values will be rejected with a 400 error.
3911 **Deprecated**: Deprecated. Models released after Claude Opus 4.6 do not support setting temperature. A value of 1.0 will be accepted for backwards compatibility, all other values will be rejected with a 400 error.
39123912 
39133913 Amount of randomness injected into the response.
39143914 
from line 5399
53995399 
54005400 minimum: 0
54015401 
5402 - `model: Model`
5402 - `model: Model or null`
54035403 
54045404 The model that will complete your prompt.
54055405 
from line 5497
54975497 
54985498 Token usage for the fallback-model attempt of a server-side fallback request.
54995499 
5500 Produced in place of a `message` entry for whichever hop served the
5501 response. A declined hop produces the existing `message` entry. Whether
5502 a fallback model served the response is signalled by the presence of this
5503 entry in `usage.iterations`.
5500 The terminal entry of a fallback-served turn: when a fallback hop's
5501 output is the returned message, the entry for the iteration that
5502 completed it carries this type in place of `message`. A declined hop
5503 and the serving hop's earlier tool-loop iterations produce `message`
5504 entries. Whether a fallback model served the response is signalled by
5505 the presence of this entry in `usage.iterations`.
55045506 
55055507 - `type: "fallback_message"`
55065508 
from line 8367
83658367 
83668368 - `defer_loading: optional boolean or null`
83678369 
8368 Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.
8369 
8370 - `enabled: optional boolean or null`
8371 
8372 Whether this member is offered to the model. Default is per member, per the toolset's documentation
8370 Defer loading for this member. Must resolve to the same value on every enabled member of t
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