Anthropic ships Claude Opus 5, and it tops the intelligence index
Anthropic released Claude Opus 5 on 24 July, positioning it as near-Fable 5 intelligence at roughly half the cost, with software engineering as the headline strength. Artificial Analysis now has Claude Opus 5 (Adaptive Reasoning, Max Effort) at the top of its intelligence index at 60.7, with a coding score of 78 — ahead of both Fable 5 and GPT-5.6 Sol. For anyone picking a default model for agentic coding work, the cost-per-capability line has moved again in under a week.