Anthropic has issued a correction regarding the reported speedup of its Claude Opus 4 model. The significant speed improvements, approximately threefold on average, were achieved in May 2025, not May 2024 as previously stated. An evaluation framework created in September 2024 was used to backtest earlier models, which showed no speedup in May 2024. AI
IMPACT Clarifies the timeline for a model's performance improvements, impacting understanding of its development trajectory.
RANK_REASON Correction to a previous announcement, not a new release or significant event.
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