Week 39, 2026September 25, 2026

Opus 5.5 takes the crown in the busiest launch week of the year

Tuesday, September 22 brought five launches in one day: Anthropic's Claude Opus 5.5, OpenAI's GPT-6 Sol and Luna, and Xiaomi's MiMo-V2.6 Pro and Flash. That's enough to reshuffle the whole board. This is our debut edition, so there are no movement arrows yet. From next week, every change gets tracked.

No. 1 this week Claude Opus 5.5 Anthropic · Score 97 Top of the Artificial Analysis Intelligence Index and the best coder on the board, for less than Opus 5 cost. A new champion on day one.
#Movement±ModelScore
1 · Claude Opus 5.5Anthropic 97
2 · Claude Fable 5.1Anthropic 95
3 · GPT-6 AstraOpenAI 94
4 · GPT-6 SolOpenAI 92
5 · Gemini 3.8 FlashGoogle 90
6 · Muse Spark 1.3Meta 89
7 · Gemini 3.1 ProGoogle 87
8 · Kimi K3Moonshot AI 86
9 · Grok 4.7xAI 84
10 · GLM-5.3Z.ai · open 84

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