Foundation Models · Medium impact
Artificial Analysis ranks Claude Opus 5.5 first on intelligence index
Published
What happened
Artificial Analysis lists Claude Opus 5.5 as released in September 2026 and ranks its adaptive-reasoning, maximum-effort configuration first among 211 models, scoring 58 on its Intelligence Index. The page reports a one-million-token context window and pricing of $4 per million input tokens and $20 per million output tokens, but provides benchmark analysis rather than a launch announcement.
Why it matters
The reported capability and context window make this a candidate for evaluation on complex, document-heavy work in UK organisations. However, above-median token prices and high output volumes mean procurement teams should compare cost per completed task, not benchmark rank alone; the reported $5.98 per task relates specifically to this evaluation.
Executive action
This quarter, ask your AI lead to verify availability and supplier pricing, then compare this configuration with your current model on a small set of representative business tasks, measuring quality and total cost.