GPT-6.1 Sol vs GPT-6.1 Terra
A plain comparison: what they do, what they cost and which to pick for your task.
In short
Terra is half the price and faster, enough for most questions. Sol is smarter: pick it for writing, code and tricky explanations.
GPT-6.1 Terra is cheaper: an answer costs 2 times less than with GPT-6.1 Sol.
Side by side
| GPT-6.1 Sol | GPT-6.1 Terra | |
|---|---|---|
| Maker | OpenAI, USA | OpenAI, USA |
| Type | everyday | fast and cheap |
| Good for | ChatGPT’s everyday model. Answers any question, writes text and code. | The mid-size ChatGPT: fast and inexpensive, enough for most questions. |
| Official, $ per 1M | $2 / $10 | $1 / $5 |
| Freepay rate | ×1 / ×5 | ×0.5 / ×2.5 |
| Maker’s subscription | ChatGPT Plus costs $20 a month. | ChatGPT Plus costs $20 a month. |
Prices: your text / answer. The “Freepay rate” shows how many balance tokens a model spends per token of its own; Claude Sonnet 5.5 is ×1.
Which to pick for the task
| Task | Better |
|---|---|
| Simple questions | GPT-6.1 Terra |
| Writing and code | GPT-6.1 Sol |
| Tricky explanations | GPT-6.1 Sol |
| Price | GPT-6.1 Terra |
The best way to choose is to ask both models the same question. On Freepay you do it in one chat, switching the model in the input field.
About GPT-6.1 Sol
ChatGPT’s everyday model. Answers any question, writes text and code. GPT models are made by OpenAI and power ChatGPT, the best-known AI chat. It answers any question, does maths, explains and helps with study. More about GPT-6.1 Sol.
About GPT-6.1 Terra
The mid-size ChatGPT: fast and inexpensive, enough for most questions. More about GPT-6.1 Terra.
Frequently asked questions
Which is better, GPT-6.1 Sol or GPT-6.1 Terra?
Terra is half the price and faster, enough for most questions. Sol is smarter: pick it for writing, code and tricky explanations.
Which is cheaper, GPT-6.1 Sol or GPT-6.1 Terra?
GPT-6.1 Terra is cheaper: an answer costs 2 times less than with GPT-6.1 Sol. Official prices per 1M tokens: GPT-6.1 Sol $2 / $10, GPT-6.1 Terra $1 / $5. On Freepay both are 10x cheaper.
Can I use GPT-6.1 Sol and GPT-6.1 Terra in one place?
Yes. On Freepay both models are in one chat, you switch them in the input field, and the balance is shared.
Do I need two subscriptions for GPT-6.1 Sol and GPT-6.1 Terra?
No. ChatGPT needs an account, the free plan limits the best models, and ChatGPT Plus is a monthly subscription. On Freepay one key covers both, with no subscription.