Chat with all AIClaude Sonnet 5.5 vs GPT-6.1 Sol
Claude Sonnet 5.5 (Anthropic) and GPT-6.1 Sol (OpenAI) 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
| Claude Sonnet 5.5 | GPT-6.1 Sol | |
|---|---|---|
| Made by | Anthropic | OpenAI |
| Group in the menu | Complex work | Complex work |
| Speed | Fast | Medium |
| Best for | Writing that needs the right tone, Coding and code review | Debugging and code reasoning, Analysis of long pages and reports |
| On Pro | Unlimited (fair use) | Unlimited (fair use) |
| Separate subscription needed? | No — included | No — included |
Quick verdict
- Coding: GPT-6.1 Sol usually has the edge.
- Writing: Claude Sonnet 5.5 usually has the edge.
- Speed: Claude Sonnet 5.5 usually has the edge.
- Hard reasoning: GPT-6.1 Sol usually has the edge.
- Brainstorming: Claude Sonnet 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 Claude Sonnet 5.5 shines
- Very natural, human-sounding prose
- Strong, careful code with explanations
- Keeps the author's voice when editing
- Good judgment on what to leave out
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
Watch-outs
Claude Sonnet 5.5
- For the very hardest problems step up to Opus 5.5
- Sometimes cautious — tell it the context and goal
- No live web search inside the extension
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
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 Claude Sonnet 5.5 for writing that needs the right tone and coding and code review. Choose GPT-6.1 Sol for debugging and code reasoning and analysis of long pages and reports. They come from different labs, so using both is a great way to catch mistakes.
Frequently asked questions
Is Claude Sonnet 5.5 better than GPT-6.1 Sol?
It depends on the task. Claude Sonnet 5.5 is strongest at writing that needs the right tone; GPT-6.1 Sol shines at debugging and code reasoning. 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, Claude Sonnet 5.5 or GPT-6.1 Sol?
In practice Claude Sonnet 5.5 is fast and GPT-6.1 Sol is medium. Real speed also depends on answer length and load.
Can I use Claude Sonnet 5.5 and GPT-6.1 Sol with one subscription?
Yes. Both are in Chat with all AI. Try them with 3 free requests; Pro covers both.
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