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GPT-5.6 Luna is now the default model for llm, replacing GPT-4o mini

The default model for llm users without a custom default has changed from GPT-4o mini to GPT-5.6 Luna, offering better quality at a slightly higher price. Users can switch back to GPT-4o mini or to the cheaper GPT-5 nano. ✦ AI generated

Release author · Simon Willison's Weblog · 2026-07-30 · original ↗

The default model for users who have not set their own default is now GPT-5.6 Luna. It was previously GPT-4o mini. Luna is a much better and more recent model, albeit slightly more expensive - $0.20 per million input tokens and $1.20 per million output tokens, compared to $0.15/$0.60 for 4o mini. You can switch back to 4o mini using llm models default gpt-4o-mini, or switch to GPT-5 nano, an even cheaper default model ($0.05/$0.40), using llm models default gpt-5-nano. #1576

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