Rumors: OpenAI to Launch GPT-6 'Bel' by December, Anthropic Responds with Fable 5.5

Unverified rumors on X claim OpenAI's next model, codenamed GPT-6 'Bel', is far better than rivals and may launch by December. Anthropic reportedly just completed a large-scale pretraining run and will respond with the Fable 5.5 series.

2026-10-03 ~ 2026-10-05 · 2 related posts

• Rumored GPT-6 'Bel' from OpenAI to face off against Anthropic's Fable 5.5 lineup — CurieuxExplorer · 2026-10-03
• Rumor: OpenAI's 'Bel' may land by December as Anthropic pretrains a big new model — imjustnewatai · 2026-10-05