Source Intelligence
Sweep 28 Aug 2026 ยท 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

One change

introducing-claude-fable-5-and-claude-mythos-5

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

first seen The page's own history The capture it came from

Nearest release: v2.1.246, published 3 hours after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

models/fable-5/introducing-claude-fable-5-and-claude-mythos-5 Changed · +3 / -3 lines

from line 93
 
 Step-by-step instructions live in the migration guide:
 
-* From Claude Mythos Preview: see [Migrating from Claude Mythos Preview to Claude Mythos 5](https://platform.claude.com/docs/en/about-claude/models/migration-guide#migrating-from-claude-mythos-preview).
-* From Claude Opus 4.8: see [Migrating from Claude Opus 4.8 to Claude Fable 5](https://platform.claude.com/docs/en/about-claude/models/migration-guide#migrating-from-claude-opus-48).
+* From Claude Mythos Preview: see [Migrating from Claude Mythos Preview to Claude Mythos 5](https://platform.claude.com/docs/en/models/fable-5/migration-guide#migrating-from-claude-mythos-preview).
+* From Claude Opus 4.8: see [Migrating from Claude Opus 4.8 to Claude Fable 5](https://platform.claude.com/docs/en/models/fable-5/migration-guide#migrating-from-claude-opus-48).
 
 ## Next steps
 
 <CardGroup>
-  <Card title="Migration guide" icon="arrow-right" href="https://platform.claude.com/docs/en/about-claude/models/migration-guide">
+  <Card title="Migration guide" icon="arrow-right" href="https://platform.claude.com/docs/en/models/fable-5/migration-guide">
     Step-by-step upgrade instructions from Claude Opus 4.8 and Claude Mythos Preview.
   </Card>