Model
Who uses GPT-6 Astra
2 people list GPT-6 Astra as their model, 3 more use it alongside something else. Newest evidence: Simon Willison, Sep 15, 2026.
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Also in the mix
- Dax Raad · Evaluated by the team; Dax says it has novel capabilities but doubles effective spend.
- Kieran Klaassen · Tested Astra as a showy model for vibe coding and landing pages, but not as trustworthy for day-to-day engineering as Fable.
- Theo Browne · Used and reviewed alongside Fable 5.1; Theo describes it as capable of extraordinary results but unusually spiky.