BREAKING
Anthropic Ships Claude Fable 5
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SWE-Bench Pro
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OS-World Verified
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FrontierCode Diamond
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Input / M tokens
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Output / M tokens
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Max output
The Fable 5 Agentic OS
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Claude Code harness
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Link Obsidian vault
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Build dashboard
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Automate tasks
Strengths vs Limitations
Strengths
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50M-line migration in a day
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Long autonomous runs
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Self-verification
Limitations
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Fallback to Opus 4.8
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No raw chain-of-thought
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30-day data retention
Fable 5 Reshapes Agentic Coding
AI NEWS BLITZ
Anthropic has launched Claude Fable 5, a top-tier model built for long-horizon agentic work.