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introducing-claude-fable-5-and-claude-mythos-5about-claude/models/introducing-claude-fable-5-and-claude-mythos-5

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.

This page was removed upstream on 24 Aug 2026. Its history is below, and the last text this site read is still at .md on this URL.

Recorded changes3including the first read

Lines now133in the newest capture

Characters10,151in the newest capture

First seen 14 Aug 2026 04:31 UTC

Last changed 24 Aug 2026 21:07 UTC

Every recorded edit

3 edits since this site first read it

WhenTitle it carriedWhatLines

24 Aug 26 introducing-claude-fable-5-and-claude-mythos-5 −removed +0−133 21 Aug 26 introducing-claude-fable-5-and-claude-mythos-5 ±changed +2−2 14 Aug 26 introducing-claude-fable-5-and-claude-mythos-5 ·first recorded +133−0

As it stands

Lines133
Characters10,151
Categoryabout-claude
Pathabout-claude/models/introducing-claude-fable-5-and-claude-mythos-5

Read it upstream →

Sections it gained

## Models
## Refusals, fallback, and billing on Claude Fable 5
### Refusals
### Fallback
### Billing
## Availability
## Working with Claude Fable 5 and Claude Mythos 5
### Prompting
## Messages API on Claude Fable 5 and Claude Mythos 5
### Adaptive thinking is always on
### Raw thinking content is never returned
## Supported features