Anthropic reportedly trained Opus 5.5 with an even stronger internal model
haider1 · x · 2026-09-28
- The poster speculates Opus 5.5 is itself the product of an even stronger internal Anthropic model used for training/research.
- It reportedly beats Fable 5.1 while being smaller than Opus 5.0, implying the internal model must be extremely capable.
- He predicts open models with this capability level could run locally within 6-12 months.
More from Models
- TypeSafe AI's Jev returns confidence-scored decisions, not text: a16z sits down with Diogo Almeida — a16z · 2026-09-28
- Meta recaps 6 months of launches: 10 Muse releases plus Meta Model API — AIatMeta · 2026-09-28
- Vercel CEO: open models now drive 80% of Vercel's token traffic as OpenAI, Gemini, Anthropic lose ground — RihardJarc · 2026-09-28
- Real-time robot control showdown: GPT-6 Astra vs Opus 5.5 vs Grok 4.7 vs MolmoAct2 — DJiafei · 2026-09-28
- Open Models Now 4 Months Behind Frontier, Handle 56% of Vercel Gateway Tokens — bigdata · 2026-09-28
- Users Report Being Routed to Unreleased Claude Sonnet 5.5, Even on Free Tier — lyraxana · 2026-09-28