Chat with all AIGPT-6.1 Sol vs Claude Opus 5.5
GPT-6.1 Sol (OpenAI) and Claude Opus 5.5 (Anthropic) are both in Chat with all AI's model menu. Here's how they differ in practice, which to pick for which task, and how to compare them on your own prompt in seconds.
At a glance
| GPT-6.1 Sol | Claude Opus 5.5 | |
|---|---|---|
| Made by | OpenAI | Anthropic |
| Group in the menu | Complex work | Hardest problems |
| Speed | Medium | Thorough |
| Best for | Debugging and code reasoning, Analysis of long pages and reports | Complex coding and architecture, Long documents and contracts (with human review) |
| On Pro | Unlimited (fair use) | 30 a day |
| Separate subscription needed? | No — included | No — included |
Quick verdict
- Coding: Both are solid — try your prompt on each.
- Writing: Claude Opus 5.5 usually has the edge.
- Speed: GPT-6.1 Sol usually has the edge.
- Hard reasoning: Both are solid — try your prompt on each.
- Brainstorming: Claude Opus 5.5 usually has the edge.
Verdicts reflect how these models are generally positioned and reported in 2026. Your own prompts are the best test.
Where GPT-6.1 Sol shines
- Strong multi-step reasoning
- Good at planning before answering
- Reliable with structured output
- Efficient for heavy daily use on Pro
Where Claude Opus 5.5 shines
- Top-tier code quality and debugging
- Very careful, thorough reasoning
- Excellent long-context reading
- Clear about assumptions and risks
Watch-outs
GPT-6.1 Sol
- Slower than Luna and Terra — worth it for hard tasks
- Long answers by default; ask for brevity if needed
- Still double-check facts and code before shipping
Claude Opus 5.5
- Slower — use Sonnet or Haiku for quick tasks
- Pro includes 30 requests a day on max-tier models
- Not a substitute for a lawyer, doctor or accountant
Prompts to test both
Send a prompt with one model, then switch the model and press Regenerate. Each answer is labelled with the model that wrote it.
Bottom line
Choose GPT-6.1 Sol for debugging and code reasoning and analysis of long pages and reports. Choose Claude Opus 5.5 for complex coding and architecture and long documents and contracts (with human review). They come from different labs, so using both is a great way to catch mistakes.
Frequently asked questions
Is GPT-6.1 Sol better than Claude Opus 5.5?
It depends on the task. GPT-6.1 Sol is strongest at debugging and code reasoning; Claude Opus 5.5 shines at complex coding and architecture. The quickest way to know is to ask both the same question — in Chat with all AI that's one model switch.
Which is faster, GPT-6.1 Sol or Claude Opus 5.5?
In practice GPT-6.1 Sol is medium and Claude Opus 5.5 is thorough. Real speed also depends on answer length and load.
Can I use GPT-6.1 Sol and Claude Opus 5.5 with one subscription?
Yes. Both are in Chat with all AI. Try them with 3 free requests; Pro covers both.
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