GPT-6 Sol and Luna near launch as Terra is cut, leak roundup says

Leon Lin @LexnLinOriginally posted 2026.09.22

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damn, so basically: tl;dr: - GPT-6 Sol + Luna nearing launch, Terra discontinued - Fable + Opus + Sonnet 5.5 incoming - Opus 5.5 apparently imminent + cheaper - Haiku may be discontinued too - Astra 6.1 still in RL, expected to compete with Fable 5.5 - Bel, OpenAI's next larger pretrain, potentially not public until late this year at the earliest - Kimi K3.1 + Grok 4.7 this week (today??) also sounds like 6 Sol may struggle against the new Opus

This post quotes another post: “Leak: OpenAI preps GPT-6 Sol and Luna, Astra 6.1 in RL training”