DeepSeek V4 Pro vs Gemini 3.5 Flash: price, context window and capabilities
DeepSeek V4 Pro (deepseek/deepseek-v4-pro) is a language model from DeepSeek and Gemini 3.5 Flash (google/gemini-3.5-flash) a multimodal language model from Google; both are on the OceanToken API. DeepSeek V4 Pro costs less per token than Gemini 3.5 Flash: $1.056 against $1.35 per 1M input tokens (22% less) and $3.168 against $8.10 per 1M output tokens (61% less). Gemini 3.5 Flash is 10% off its official price on OceanToken, for every account. Both have a 1.05M-token context window (1,048,576 tokens). Both support tool calling, reasoning and structured outputs; only Gemini 3.5 Flash also lists image input, file input, audio input and video input.
Side by side
| Spec | DeepSeek V4 Pro −40% | Gemini 3.5 Flash −10% |
|---|---|---|
| Model | DeepSeek V4 Prodeepseek/ | Gemini 3.5 Flashgoogle/ |
| Publisher | DeepSeek | |
| Kind | Text | Text, vision, audio & video |
| Context window | 1.05M tokens1,048,576 | 1.05M tokens1,048,576 |
| Input price | $1.056 / 1M tokens | $1.35 / 1M tokens |
| Output price | $3.168 / 1M tokens | $8.10 / 1M tokens |
| Cached input price | $0.044 / 1M tokens | $0.15 / 1M tokens |
| Cache write price | – | $1.583 / 1M tokens |
| Web search price | – | $0.014 / search |
| Discount (vs official, top tier) | −40% | −10% |
| Inputs | text | text, images, files, audio and video |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Choose DeepSeek V4 Pro to spend less per token: 22% less for input and 61% less for output than Gemini 3.5 Flash.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose Gemini 3.5 Flash if you need image input, file input, audio input and video input: DeepSeek V4 Pro does not list them.
- Not sure? Call both with the same OceanToken API key and compare them on your own prompts; each request is billed per use from one prepaid balance.
Get API Key DeepSeek V4 Pro Gemini 3.5 Flash
Frequently asked questions
Which is cheaper, DeepSeek V4 Pro or Gemini 3.5 Flash?
DeepSeek V4 Pro. DeepSeek V4 Pro costs less per token than Gemini 3.5 Flash: $1.056 against $1.35 per 1M input tokens (22% less) and $3.168 against $8.10 per 1M output tokens (61% less). Gemini 3.5 Flash is 10% off its official price on OceanToken, for every account. The OceanToken console always shows the current price.
Which has the larger context window, DeepSeek V4 Pro or Gemini 3.5 Flash?
Neither. Both have a 1.05M-token context window (1,048,576 tokens).
Can I call both DeepSeek V4 Pro and Gemini 3.5 Flash with one API key?
Yes. Both are on the OceanToken API at https://api.oceantoken.ai/v1: one API key and one prepaid balance call either model. Send the model id deepseek/deepseek-v4-pro or google/gemini-3.5-flash.
Models and publishers
DeepSeek V4 Pro · Gemini 3.5 Flash · All DeepSeek models · All Google models
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