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DeepSeek V4 Pro vs Gemini 3.1 Pro (preview)
Price, context window and capabilities side by side — read from the same catalog that meters your calls, not from a press release.
DeepSeek V4 Pro is 1.5x cheaper on input. DeepSeek V4 Pro is 3.0x cheaper on output. Gemini 3.1 Pro (preview) holds 1M tokens against 128K.
At a glance
Side by side
DeepSeek
Retired by DeepSeek on 14 Sep 2026. Requests are served by V4.1 Flash from then, and billed at Flash's rate.
Google's newest Pro tier, shipped as a preview.
Specifications
Every difference we can measure
| DeepSeek V4 Pro | Gemini 3.1 Pro (preview) | |
|---|---|---|
| Input price | $1.32/M | $2/M |
| Output price | $3.96/M | $12/M |
| Context window | 128K tokens | 1M tokens |
| Vision | No | Yes |
| Tool calling | Yes | Yes |
| Prompt caching | No | Yes |
| Long context | No | Yes |
A row appears only when we hold the fact for both models. Anything the provider has not published is left out rather than guessed, so an empty row is missing data and never a zero.
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FAQ
Frequently asked questions
What is the difference between DeepSeek V4 Pro and Gemini 3.1 Pro (preview)?
DeepSeek V4 Pro is 1.5x cheaper on input. DeepSeek V4 Pro is 3.0x cheaper on output. Gemini 3.1 Pro (preview) holds 1M tokens against 128K. Only Gemini 3.1 Pro (preview) declares vision. Only Gemini 3.1 Pro (preview) declares prompt caching. Only Gemini 3.1 Pro (preview) declares long context. Both run on the same endpoint and the same key here, so trying each is a one-line change to the model id.
Which is cheaper, DeepSeek V4 Pro or Gemini 3.1 Pro (preview)?
DeepSeek V4 Pro is, on input tokens. Output usually dominates the bill on generative work, so check the output row above against your own ratio of prompt to completion before deciding.
Can I switch between DeepSeek V4 Pro and Gemini 3.1 Pro (preview) without changing my code?
Yes. Both are OpenAI-compatible through one CompanyFabric key, so switching is the model string and nothing else — no second SDK, no second contract, one prepaid balance across both.
Do I have to choose?
No. Send companyfabric/auto and we route each request to the cheapest model that can serve it, which is how most people use both without deciding in advance.
One key. Every model. Exact prices.
Run DeepSeek V4 Pro and Gemini 3.1 Pro (preview) on the same key and compare them on your own prompts. Free starter credits included, no subscription required.