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Opus 5 Stunning Data: Faster Iteration and Reinforcement Learning Show Significant Effects

Published: 2026-07-25 01:07 Source: X: Nathan Lambert (@natolambert)

Opus 5's data is astonishing: faster iteration speed combined with the power of scaled reinforcement learning (Fable is still too large for RL). On safety measures: "According to our tests, we expect the classifier's intervention frequency to be reduced by about 85% compared to Fable 5." Let's get to work.

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