Chat with all AIGPT-6.1 Terra vs GPT-6.1 Sol
GPT-6.1 Terra (OpenAI) 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
| GPT-6.1 Terra | GPT-6.1 Sol | |
|---|---|---|
| Made by | OpenAI | OpenAI |
| Group in the menu | Complex work | Complex work |
| Speed | Fast | Medium |
| Best for | Drafting longer emails and documents, Analyzing a page or report | 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: Both are solid — try your prompt on each.
- Speed: GPT-6.1 Terra usually has the edge.
- Hard reasoning: GPT-6.1 Sol usually has the edge.
- Brainstorming: Both are solid — try your prompt on each.
Verdicts reflect how these models are generally positioned and reported in 2026. Your own prompts are the best test.
Where GPT-6.1 Terra shines
- Good balance of speed and depth
- Clear reasoning you can follow
- Handles multi-part instructions
- Consistent formatting for documents
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
GPT-6.1 Terra
- For the hardest reasoning pick Sol or a max-tier model
- Can over-structure casual answers — ask for prose if you prefer
- No browsing: share the page with 'This page' instead
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 GPT-6.1 Terra for drafting longer emails and documents and analyzing a page or report. Choose GPT-6.1 Sol for debugging and code reasoning and analysis of long pages and reports. They come from the same family, so the choice is mostly about speed versus depth.
Frequently asked questions
Is GPT-6.1 Terra better than GPT-6.1 Sol?
It depends on the task. GPT-6.1 Terra is strongest at drafting longer emails and documents; 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, GPT-6.1 Terra or GPT-6.1 Sol?
In practice GPT-6.1 Terra is fast and GPT-6.1 Sol is medium. Real speed also depends on answer length and load.
Can I use GPT-6.1 Terra 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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