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Anthropic upgrades Claude with new Fable 5.2 model, details here

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Anthropic upgrades Claude with new Fable 5.2 model, details here

Anthropic is out with its second big update to Claude Fable 5 since introducing the model class back in June. Here’s what’s new with Claude Fable 5.2.

Anthropic first released Fable 5, its Mythos-class AI model for Claude, over the summer. In September, Anthropic enhanced Claude with its more capable Fable 5.1 model upgrade.

In Anthropic’s world, Fable is Claude’s most capable model. Haiku, Sonnet, and Opus are the small, medium, and large models below Fable.

Starting today, Claude Fable 5.2 and Mythos 5.2 are the latest best-in-class models.

Here’s what Anthropic says about the newest Claude Fable and Mythos versions:

Claude Fable 5.2 and Claude Mythos 5.2 show improvements in areas like coding, reasoning, and vision. […]

Testers have found that Fable 5.2 and Mythos 5.2 communicate more clearly than past Fable and Mythos models. They generate outputs up to 30% faster than Claude Fable 5.1 and Claude Mythos 5.1, and they’re available at a lower price: $8 per million input tokens and $40 per million output tokens. […]

Fable and Mythos are best for the most ambitious, open-ended technical work. For most coding and knowledge tasks, we recommend that users start with Claude Opus 5.5, our strongest daily driver, and then switch to a different model as required, depending on the scope and complexity of their work—upward to Fable or Mythos, or downward to Claude Sonnet 5.5 or Claude Haiku 5.5.

Over 90% of the changes merged into Anthropic’s core codebase are now written by Claude (with human guidance).


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