With Opus 5.5 and Sonnet 5.5 both apparently outperforming Sol and Astra, Anthropic has technically made OpenAI’s Dev Day a lot more interesting. OpenAI is reportedly planning 20+ launches tomorrow, so I’m really curious to see what they have in store now. The timing couldn’t be more interesting. 😅
They launched Sonnet 5.5 just day before Dev Day and is almost matching benchmarks of Opus 5.5
Read the full story at r/OpenAI ↗
Timeline · 4 reports
- 2026-09-30 10:00 · Stratechery (Ben Thompson)
OpenAI Dev Day, Dot and OpenAI's Product Transition, Sign In With ChatGPT - 2026-09-29 21:08 · r/singularity
My tldr for OpenAI dev day - 2026-09-29 04:29 · r/OpenAI
With Opus 5.5 and Sonnet 5.5 both apparently outperforming Sol and Astra, Anthropic has technically made OpenAI’s Dev Day a lot more interesting. OpenAI is reportedly planning 20+ launches tomorrow, so I’m really curious to see what they have in store now. The timing couldn’t be more interesting. 😅 - 2026-09-29 04:28 · r/ClaudeAI
With Opus 5.5 and Sonnet 5.5 both apparently outperforming Sol and Astra, Anthropic has technically made OpenAI’s Dev Day a lot more interesting. OpenAI is reportedly planning 20+ launches tomorrow, so I’m really curious to see what they have in store now. The timing couldn’t be more interesting. 😅