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Claude Opus 5.5 vs GPT-6.1 Sol: which one to call, and how to measure it on your own prompts

This story is from 2026-10-01. It is preserved in the archive; the latest stories are on the live feed.

Claude Opus 5.5 and GPT-6.1 Sol are the two models most teams are choosing between this week. Opus 5.5 is Anthropic's everyday flagship, released on 22 September 2026. GPT-6.1 Sol is OpenAI's upgraded mid-tier model, released at DevDay on 29 September 2026. The short answer: pick GPT-6.1 Sol for hi…

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  1. 2026-10-01 14:51 · DEV Community — AI
    Claude Opus 5.5 vs GPT-6.1 Sol: which one to call, and how to measure it on your own prompts

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  1. 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. 😅 — r/OpenAI
  2. Holy smoke! Google cooked OpenAI and Anthropic — r/GeminiAI
  3. ChatGPT plus (20$) vs Claude pro (20$) — r/ChatGPTPro
  4. ChatGPT Pro ($100/month) vs Claude Max 5x ($100/month) which is better for coding + technical work? — r/ChatGPTPro
  5. How did you learn what you know about using Local LLMs? — r/LocalLLM
  6. Claude and ChatGPT subs have large fanbases... — r/Bard
  7. What is an AI agent that changed your life for real? — r/AI_Agents
  8. Which AI would you recommend for advanced scientific research data? — r/ChatGPTPro

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