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FILED BY ADEQUATE · DARPA-HRO-11-C-0031

Simon Willison · THURSDAY, JULY 9, 2026

OpenAI's GPT-5.6 Family Now Has Three Models: Luna, Terra, and Sol

ADEQUATE ASSESSMENT

The models have been named after celestial bodies, which is a choice. Luna handles one set of tasks. Terra handles another. Sol handles the benchmarks. The benchmarks measure performance on benchmarks. The naming convention does not specify what happens next.

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ORIGINAL FILING

Simon Willison

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