Rumor: OpenAI's GPT-5.6 Luna Beats Sonnet 5 at 80% Lower Cost

alejandroll10 · x · 2026-08-11

A user claims that OpenAI's GPT-5.6 Luna outperforms Anthropic's Claude Sonnet 5 while being 80% cheaper. This comes as a direct response to Anthropic making Sonnet 5's introductory pricing ($2 per million input tokens and $10 per million output tokens) permanent.

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