OpenAI's future model 'Bel' reportedly finishes pretraining in August

OpenAI has run unusually heavy pretraining since late 2025; a leak claims Sol finished in March, Astra in April/May, and the mysterious long-term model 'Bel' completed pretraining in August.

2026-08-28 ~ 2026-08-29 · 2 related posts

• OpenAI reportedly running many pre-trains; far-future model codenamed 'Bel' — haider1 · 2026-08-28
• Rumor: OpenAI's "Bel" model finished pre-training in August — haider1 · 2026-08-29