Independent benchmark shows big drops on Claude Fable 5 after its relaunch, here’s the actual context
Saw this chart from BridgeMind going around. They reran BridgeBench (a coding benchmark covering debugging, refactoring, and hallucination detection) comparing the July 1 relaunch of Fable 5 to the original June 12 version: Debugging: 86.2 → 25.9 Refactoring: 73.6 → 38.4 Hallucination: 75.9 → 61.7 Some context worth having before jumping to conclusions: Fable 5 and Mythos 5 got pulled on June 12 due to a Commerce Department export control order, tied to a reported jailbreak that got the model to expose exploitable vulnerabilities. When it came back on July 1, Anthropic added a new safety classifier that catches the reported technique in 99%+ of cases, and any flagged request gets silently rerouted to Opus 4.8 instead of refused outright. That’s the mechanism BridgeMind is pointing at...
