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Claude Fable 5.1 and Claude Mythos 5.1

L4 · DeveloperModels & ReleasesHacker News· 9/1/2026

Major model update with significant pricing changes and enterprise features for developers building with Claude API.

AI Summary

Anthropic launches Claude Fable 5.1 and Mythos 5.1 with 25-45% cost reductions, improved safeguards, and enterprise data privacy controls.

Excerpt

Introducing Claude Fable 5.1 and Claude Mythos 5.1

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