DeepSeek V4 Pro vs Claude Sonnet 5.5
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. Claude Sonnet writes far more natural text and handles long documents better.
DeepSeek V4 Pro is cheaper: an answer costs 2.5 times less than with Claude Sonnet 5.5.
Side by side
| DeepSeek V4 Pro | Claude Sonnet 5.5 | |
|---|---|---|
| Maker | DeepSeek, China | Anthropic, USA |
| Type | everyday | everyday |
| Good for | A strong DeepSeek for maths, logic and code at a low price. | Claude’s everyday model. Natural writing and good code, the best value of the line. |
| 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. | Claude Pro costs about $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 |
| Writing | Claude Sonnet 5.5 |
| Code | Claude Sonnet 5.5 |
| Long documents | Claude Sonnet 5.5 |
| 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 Claude Sonnet 5.5
Claude’s everyday model. Natural writing and good code, the best value of the line. Claude is made by Anthropic, a US company. People pick it for natural writing, strong code and the way it handles long documents. More about Claude Sonnet 5.5.
Frequently asked questions
Which is better, DeepSeek V4 Pro or Claude Sonnet 5.5?
DeepSeek V4 Pro is noticeably cheaper and good at maths and code. Claude Sonnet writes far more natural text and handles long documents better.
Which is cheaper, DeepSeek V4 Pro or Claude Sonnet 5.5?
DeepSeek V4 Pro is cheaper: an answer costs 2.5 times less than with Claude Sonnet 5.5. Official prices per 1M tokens: DeepSeek V4 Pro $1.32 / $3.96, Claude Sonnet 5.5 $2 / $10. On Freepay both are 10x cheaper.
Can I use DeepSeek V4 Pro and Claude Sonnet 5.5 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 Claude Sonnet 5.5?
No. DeepSeek’s own chat is free but needs an account and is often overloaded at peak hours. On claude.ai you need an account and a phone number, the free plan has tight message limits, and Claude Pro is a monthly subscription. On Freepay one key covers both, with no subscription.