[AINews] OpenAI launches GPT 5.6 Sol/Terra/Luna, Codex becomes ChatGPT superapp
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OpenAI released GPT-5.6 in three sizes (Sol, Terra, Luna) with a new "ultra" reasoning mode that coordinates multiple agents in parallel to handle complex tasks. Terra matches Claude Fable 5's performance in one-third the time at one-quarter the cost, while Luna outperforms Opus 4.8 at roughly one-sixth the cost per task. OpenAI integrated these models into ChatGPT Work, a new desktop app merging Codex and ChatGPT, along with multi-agent capabilities and programmatic tool calling to support automated workflows.
Why it matters
A big day for OpenAI.