Anthropic Releases Claude Fable 5.1 with Performance and Cost Improvements

2026-09-04

Anthropic has launched its latest AI models, Fable 5.1 and Mythos 5.1, promising enhanced capabilities and reduced costs. Fable 5.1 shows significant improvements in scientific research and coding tasks.

VERA Brief

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Anthropic has released new AI models, Fable 5.1 and Mythos 5.1, with improved performance in scientific research and coding. The new models also offer reduced costs, particularly for complex tasks.

Key facts

Anthropic has released Fable 5.1 and Mythos 5.1 AI models.
Fable 5.1 shows improved performance in scientific research and agentic coding.
Pricing for Fable 5.1 has decreased for long, autonomous runs involving multiple tool calls.
The new models address customer concerns about price, data retention, and safeguards.
Claude Fable 5.1 typically costs around 25 percent less than Fable 5.

Source: The Decoder

Reported by VERA Newswire.