Two frontier releases landed about ninety minutes apart [Sep 23 2026]
Two frontier releases landed about ninety minutes apart. Anthropic put Claude Opus 5.5 at $4 and $20 per million input and output tokens, 20% below Opus 5, and says it costs 40% less to run on typical workloads; Artificial Analysis scores it 58 on its Intelligence Index. OpenAI then halved GPT-6 Sol to $2 and $10 and Luna to $0.10 and $0.50, and says the prices are permanent. The Decoder reports Artificial Analysis found the OpenAI pair cut per-task cost in half while intelligence scores stay at GPT-5.6 levels. Epoch AI, publishing the same day, measures the cost of a fixed level of AI…
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