Claude Opus 5 tops Intelligence Index, matches Fable 5 at 26% lower cost per task

Artificial Analysis evaluates Claude Opus 5: scores 61 on Intelligence Index, tied with Fable 5, with 26% lower cost per task. Leads in agentic knowledge work and coding, but hallucination rate rises to 50%.

• cost
• benchmark
• agentic
• Artificial Analysis
• Claude Opus 5