Frank Downing(@downingARK):How quickly things can change! Here's the updated frontier with Opus 5.5, GPT-6 Sol & Luna incorporated. Opus 5.5 has kicked Astra off the frontier, giving Anthropic more ownership of peak intelligence than before, while OpenAI still dominates the mid to low end of the frontier with GPT-6 Sol & Luna coming in smarter and 50% cheaper than their prior 5.6 generations. Xiaomi's MiMo takes the rotating open source spot for today, but otherwise the entire AA Pareto frontier is dominated by just Anthropic & OpenAI.

Frank Downing

@downingARK

Director of Research, AI & Cloud @ARKinvest Disclosure:

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Frank Downing@downingARK

2026.09.22 19:40

How quickly things can change! Here's the updated frontier with Opus 5.5, GPT-6 Sol & Luna incorporated. Opus 5.5 has kicked Astra off the frontier, giving Anthropic more ownership of peak intelligence than before, while OpenAI still dominates the mid to low end of the frontier with GPT-6 Sol & Luna coming in smarter and 50% cheaper than their prior 5.6 generations. Xiaomi's MiMo takes the rotating open source spot for today, but otherwise the entire AA Pareto frontier is dominated by just Anthropic & OpenAI.

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