Claude Opus 5.5 leads the Artificial Analysis index and costs less than Opus 5. Here's what independent tests show, what it costs per task, and the caveats.
Key takeaways
- Anthropic released Claude Opus 5.5 on September 22, 2026, at $4 input and $20 output per million tokens, down from $5 and $25 for Opus 5.
- On the independent Artificial Analysis Intelligence Index, it scores 58 at its top setting, ahead of Fable 5.1 and GPT-6 Astra at 53.
- At the high setting, it scored 54 for $1.82 per task. That's more than Astra's best score, at a little over half of Astra's top-setting cost.
- At its top setting, it's very verbose, at about 119,000 output tokens per task. That makes it cost more per task than Astra there.
- Most cybersecurity tasks are routed to an older model, advanced biology work needs approval, and thinking can't be turned off.
📖 Read the full guide on Van Data Team → Claude Opus 5.5: Tops the Independent Index at a Lower Price
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