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whats-new-fable-5-2models/fable-5-2/whats-new-fable-5-2

Every read this site has made of the page, newest first. A date is when upstream edited the page, where upstream publishes that, and otherwise when the poller caught the edit; each row says which of the two it is.

Recorded changes4including the first read

Lines now225in the newest capture

Characters28,868in the newest capture

First seen 9 Nov 2026 19:07 UTC

Last changed 11 Nov 2026 17:37 UTC

Every recorded edit

4 edits since this site first read it

WhenTitle it carriedWhatLines

11 Nov 26 whats-new-fable-5-2 ±changed +8−13 09 Nov 26 whats-new-fable-5-2 ±changed +16−2 09 Nov 26 whats-new-fable-5-2 ±changed +10−5 09 Nov 26 whats-new-fable-5-2 +new page +211−0

As it stands

Lines225
Characters28,868
Categorymodels
Pathmodels/fable-5-2/whats-new-fable-5-2

Read it upstream →

Sections it gained

## Models
## Breaking changes
### Editing earlier turns invalidates thinking blocks on every account
### Only Claude Fable 5.2 and Claude Mythos 5.2 read Claude Fable 5.2 thinking blocks
### Use the computer use toolset instead of `computer_20251124`
### A Claude Fable 5.2 executor needs a Claude Fable 5.2 or Claude Mythos 5.2 advisor
## Thinking and tool choice
## Feature support
### Thinking blocks stay with the account that produced them
## Behavior differences
## Refusals, fallback, and billing
## Pricing