Count tokens in a Message changedapi/messages/count_tokens
Nearest release: v2.1.281, published an hour 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+5added
Lines−1removed
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1,061
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits10to this page, all time
The whole hunk
from line 1061, old and new numbered
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from line 1061
10611061
10621062 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
10631063
1064 - `"claude-fable-5-1" or "claude-mythos-5-1" or "claude-sonnet-5" or 14 more`
1064 - `"claude-fable-5-1" or "claude-opus-5-5" or "claude-mythos-5-1" or 15 more`
10651065
10661066 The model that will complete your prompt.
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from line 1070
10701070 - `"claude-fable-5-1"`
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10721072 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
1073
1074 - `"claude-opus-5-5"`
1075
1076 Powerful intelligence for coding, knowledge work, and long-running agents
10731077
10741078 - `"claude-mythos-5-1"`
10751079
No line in this hunk matches that.