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Gpt-6-1-sol — AI news & analysis

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• openai anthropic

GPT-6.1 Sol and Claude Sonnet 5.5 both cost $2/$10, land a day apart, and bill an order of magnitude differently

OpenAI shipped GPT-6.1 Sol at DevDay on 29 September 2026 at $2 per million input tokens and $10 per million output — the same list price Anthropic set for Claude Sonnet 5.5 the day before. The identical headline hides a 2x gap in cache reads, a 272K-token surcharge cliff on one side and none on the other, and independent per-task costs that differ by more than 10x. The rate card has stopped being the number that decides the bill.

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