ModelAnthropic · Joined Nov 9, 2026

Claude Fable 5.2

Model at Anthropic

Claude Fable 5.2 does not have a researched profile yet. Everything here comes from its recorded changes and public listings, each linked to its source.

The basics

As of Nov 12

Status: Available
Price: $8 in, $40 outPer 1M tokens, changed Nov 9
Context: 1M tokens
Open weights: No

Updates

Nov 11

New release

Claude Fable 5.2 becomes available in the Perplexity Agent API

The Agent API now supports anthropic/claude-fable-5-2. The changelog entry gives no pricing.

Nov 9

Now available

Claude Fable 5.2 is available on AWS, Google Cloud and Microsoft Foundry

Claude Fable 5.2 is available on the Claude API, Claude Platform on AWS, and Claude Models on Google Cloud (Anthropic managed). It is also available on Claude in Amazon Bedrock, Claude Models on Google Cloud (Google managed), and Claude in Microsoft Foundry.

Nov 9

Breaking change

Claude Fable 5.2 and Mythos 5.2 return 400 errors when the prefix changes

Both models enforce the prefix check for every account. Requests that edit the system prompt, tools, or an earlier message, then send back a thinking block from a later turn, return a 400 error.