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Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war

Image: Simon Willison

Anthropic released Claude Opus 5.5 while OpenAI simultaneously launched GPT-6 Sol and GPT-6 Luna, with the latter models priced at half the cost of their GPT-5.6 predecessors. Industry observers note the price cuts don't come with significant performance gains.

Why it matters

Major AI labs are competing on price while matching performance, making advanced models more affordable for developers and businesses.

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