
June 9, 2026
Claude Fable 5: The Wall is the Feature
The news isn't Fable 5's benchmarks. It's that it's Mythos 5 with parts walled off, and the model tells you when it hands your request to Opus 4.8 instead of refusing.
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The news isn't Fable 5's benchmarks. It's that it's Mythos 5 with parts walled off, and the model tells you when it hands your request to Opus 4.8 instead of refusing.
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Mythos found 10,000 critical bugs in a month. We patched 75. Discovery was never the bottleneck. We just built the wrong half of the system.
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I’ve been making photographs longer than I’ve been orchestrating AI agents. By a long way. The second thing keeps surprising me with how much it owes to the first.
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