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Anthropic Launches Claude Fable 5.1 and Mythos 5.1, Promising Cheaper, Smarter AI for Coding

Anthropic has released two advanced AI models, Claude Fable 5.1 and Mythos 5.1, which promise lower costs and improved coding abilities, marking a significant step in AI-powered software and research tools.

Read the full story → · Latest coverage 2 Sept 2026, 2:04 pm UTC

Key moments · 7

Anthropic unveils Fable 5.1 and Mythos 5.1 AI models

Bloomberg Technology ↗

Fable 5.1 and Mythos 5.1 designed for advanced coding

Hacker News ↗

Anthropic upgrades Claude with Fable 5.1 model

Technology ↗

Claude Fable 5.1 features lower costs, fewer false positives

MacRumors: Mac News and Rumors - Front Page ↗

Anthropic unveils Claude Fable 5.1 with cybersecurity features

GBHackers On Security ↗

Claude Fable 5.1 and Mythos 5.1 arrive with cheaper cache pricing

Digital Trends ↗

Anthropic introduces watermarking in Claude Fable 5.1 outputs

The New Stack ↗

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