DeepSeek V4 Pro vs GPT-6.1 Sol
A plain comparison: what they do, what they cost and which to pick for your task.
In short
DeepSeek V4 Pro is noticeably cheaper and good at maths and code. GPT-6.1 Sol understands tricky questions better, writes more naturally and knows more facts.
DeepSeek V4 Pro is cheaper: an answer costs 2.5 times less than with GPT-6.1 Sol.
Side by side
| DeepSeek V4 Pro | GPT-6.1 Sol | |
|---|---|---|
| Maker | DeepSeek, China | OpenAI, USA |
| Type | everyday | everyday |
| Good for | A strong DeepSeek for maths, logic and code at a low price. | ChatGPT’s everyday model. Answers any question, writes text and code. |
| Official, $ per 1M | $1.32 / $3.96 | $2 / $10 |
| Freepay rate | ×0.66 / ×1.98 | ×1 / ×5 |
| Maker’s subscription | DeepSeek has no subscription; its own chat is free but has queues. | 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 |
|---|---|
| Maths | DeepSeek V4 Pro |
| Code | DeepSeek V4 Pro |
| Writing | GPT-6.1 Sol |
| Questions on any topic | GPT-6.1 Sol |
| Price | DeepSeek V4 Pro |
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 DeepSeek V4 Pro
A strong DeepSeek for maths, logic and code at a low price. DeepSeek is a Chinese model that became famous for nearly matching ChatGPT at a fraction of the price. It is strong in maths, logic and code. More about DeepSeek V4 Pro.
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.
Frequently asked questions
Which is better, DeepSeek V4 Pro or GPT-6.1 Sol?
DeepSeek V4 Pro is noticeably cheaper and good at maths and code. GPT-6.1 Sol understands tricky questions better, writes more naturally and knows more facts.
Which is cheaper, DeepSeek V4 Pro or GPT-6.1 Sol?
DeepSeek V4 Pro is cheaper: an answer costs 2.5 times less than with GPT-6.1 Sol. Official prices per 1M tokens: DeepSeek V4 Pro $1.32 / $3.96, GPT-6.1 Sol $2 / $10. On Freepay both are 10x cheaper.
Can I use DeepSeek V4 Pro and GPT-6.1 Sol 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 DeepSeek V4 Pro and GPT-6.1 Sol?
No. DeepSeek’s own chat is free but needs an account and is often overloaded at peak hours. 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.