Quoting OpenAI
ai
OpenAI is previewing three new GPT-5.6 models: Sol for high-end performance, Terra at half the cost of GPT-5.5 while maintaining comparable performance, and Luna as an affordable option. General availability for all three is planned for the coming weeks, following a limited preview with trusted partners.
Source: https://simonwillison.net/2026/Jun/26/openai/#atom-everything
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