Frontier models

The highest-scoring models on the Artificial Analysis Intelligence Index. Pick from here when quality matters more than cost: hard reasoning, complex code, careful long-form writing.

Claude Opus 5.5
Anthropic · Sep 22, 2026
TextImageFiles / PDFText1M context
Score 57.6 · $4 in / $20 out per M
Claude Sonnet 5.5
Anthropic · Sep 28, 2026
TextImageFiles / PDFText1M context
Score 56 · $2 in / $10 out per M
Claude Fable 5.1
Anthropic · Sep 1, 2026
TextImageFiles / PDFText1M context
Score 53.4 · $10 in / $50 out per M
GPT-6 Astra
OpenAI · Sep 4, 2026
Files / PDFImageTextText1.05M context
Score 52.7 · $10 in / $50 out per M
GPT-6.1 Sol
OpenAI · Sep 29, 2026
Files / PDFImageTextText1.05M context
Score 51.8 · $2 in / $10 out per M
Claude Opus 5
Anthropic · Jul 24, 2026
TextImageFiles / PDFText1M context
Score 50.8 · $5 in / $25 out per M

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