BREAKING
Anthropic Releases Claude Fable 5
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$/M
Input tokens
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$/M
Output tokens
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M
Context window
Built for long-horizon agentic work
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Software engineering
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Vision tasks
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Knowledge work
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Long-horizon agents
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%
Analytical tasks
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hr
Willison test run
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x
Price vs Opus 4.8
Strong but costly, not for routine
Strengths
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Complex long-running coding
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Cinematic web builds
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Multi-file migrations
Limits
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Heavy token use, slow
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Costly for routine work
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Safety fallbacks trigger
High power, high price tradeoff
AI NEWS BLITZ
Anthropic has launched Claude Fable 5, its new Mythos-class model built for long, complex tasks.