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The new GPT-5.6 family: Luna, Terra, Sol

OpenAI just shipped three new models in the GPT-5.6 family. Here's what Luna, Terra, and Sol actually do.

Reporting by Simon Willison 1 min brief
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The KeyNews take

Why it matters

OpenAI's GPT-5.6 family launch introduces three distinct models (Luna, Terra, Sol) expanding capability options across different use cases. This signals a strategic shift toward specialized model variants rather than single flagship releases, directly impacting enterprise model selection and deployment strategies.

The key facts

4 to know

  1. GPT-5.6 family includes three models: Luna, Terra, Sol

  2. Published via Simon Willison's blog on Jul 9, 2026

  3. Represents model differentiation strategy vs. single flagship approach

  4. Family naming convention (celestial bodies) suggests thematic positioning

Go to the source

Simon Willisonsimonwillison.net

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