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Post #2786 19
⚡️ The model price war: GPT-6 Luna is half the price of the last Luna, Opus 5.5 down 20%

Claude Opus 5.5 and GPT-6 Sol/Luna landed with steep price cuts, but Opus 5.5 reportedly stalled at max reasoning on one test, burning its full output budget with no answer.

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Simon Willison’s Weblog Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war Yesterday was Grok 4.7 (pelicans) and MiMo v2.6 Flash/Pro (more pelicans). Today Anthropic released Claude Opus 5.5, and around an hour later OpenAI released GPT-6 Sol and GPT-6 Luna. It’s …
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