Anthropic's Claude Opus 5 costs well below Fable 5 while matching or beating it across most benchmarks

Anthropic’s Claude Opus 5 lands near the top of major AI benchmark suites, with especially strong results in coding and software engineering.

The model undercuts Claude Fable 5 on price, making cost a bigger differentiator as frontier model performance converges.

A notable quirk: Opus 5 often performs better on coding tasks at lower reasoning tiers than at its highest settings.

Despite strong benchmark showing, its factual accuracy and hallucination rates still trail some rivals in parts of the test set.