Claude Fable 5.2 changelog

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.

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.

Claude Fable 5.2 launches with a 1M token context window and 128k max output

Claude Fable 5.2 is built for demanding reasoning and long-horizon agentic work. It has a 1M token context window, 128k max output tokens, and always-on adaptive thinking.

Who is affected:

Developers building long-running reasoning and agent workloads can move to the new model.

Suggested next step:

Read the migration guide before switching, since the prefix check and computer use changes apply.

Claude Fable 5.2 and Mythos 5.2 launch with outputs up to 30% faster

Claude Fable 5.2 and Claude Mythos 5.2 are upgrades that show improvements in coding, reasoning, and vision. Testers found they generate outputs up to 30% faster than Claude Fable 5.1 and Claude Mythos 5.1.

Claude Fable 5.2 becomes available in GitHub Copilot

GitHub Copilot adds Claude Fable 5.2 as a model option.