GPT 5 turns one: from launch to GPT 5.6 Sol and Astra

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Alex Getman @alexgetmancom · 8 Aug 2026, 12:24 UTC · Updated 31 Oct 2026, 20:59 UTC

Notes

🎉 GPT 5 is one year old

OpenAI had a rough start, but over the past year the lineup has evolved into GPT 5.6 Sol, a full fledged flagship and one of the strongest models on the market. The next big step should be Astra, the leading candidate for GPT 6 and a competitor to Claude Fable and Mythos.

Screenshot of OpenAI's GPT-5 announcement from August 7, 2025, with headline 'Introducing GPT-5' and description as their smartest, fastest, most useful model yet with built-in thinking.

Claude Fable 5 GPT-5.6 Sol OpenAI

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