AI models

Text models right now

• Highest score58Intelligence IndexClaude Opus 5.5
• Best open weights46Intelligence IndexMiMo-V2.6-Pro
• Cheapest near the top$1.75per M tokens, blended, at 48 on the indexMeta Muse Spark 1.3
• Fastest output111tokens per secondGPT-5.6 Terra

• GPT-6.1 SolOpenAI · 29 Sep 2026Within a point of GPT-6 Astra on the Intelligence Index, at a fifth of its price.Text
• Claude Sonnet 5.5Anthropic · 28 Sep 2026Within two points of Opus 5.5 on the Intelligence Index, at half its price.Text
• Claude Opus 5.5Anthropic · 22 Sep 2026Top of the Intelligence Index at 58, performing like Fable 5.1 for 40% less than Opus 5.Text
• GPT-6 LunaOpenAI · 22 Sep 2026OpenAI's cheapest GPT-6 tier, at $0.10 in and $0.50 out per million tokens.Text
• GPT-6 SolOpenAI · 22 Sep 2026GPT-5.6 Sol's replacement at half the price, overtaken a week later by GPT-6.1 Sol.Text
• MiMo-V2.6-ProXiaomi · 22 Sep 2026The top open-weight model on the Intelligence Index, MIT-licensed along with its RL training code.TextOpen weights

All models

Intelligence Index and speed from Artificial Analysis, Arena Elo from public preference voting. Prices are standard API rates per million tokens.