Opus 5 closed most of the gap to Fable 5 at half the price. The routing rules, plus three API changes that break code written for Opus 4.8.

Anthropic's new everyday model Claude Opus 5 undercuts its own frontier product on cost and beats it almost everywhere that counts.

Anthropic's new flagship model Claude Opus 5 posts top scores in coding and knowledge work at half of Fable 5's token rates. On ARC-AGI-3, a benchmark for novel problem-solving,…