Gemini 3.5 Flash vs DeepSeek V4: Price & Agent Model Comparison 2026
Compare Google Gemini 3.5 Flash with DeepSeek V4 Flash and V4 Pro for API pricing, context windows, multimodal support, and agent workloads.
Last updated: May 2026
Pricing Comparison
| Model | Provider | Input $/1M | Output $/1M | Context | Max Output |
|---|---|---|---|---|---|
| Gemini 3.5 Flash | $1.5 | $9 | 1.05M | 65K | |
| DeepSeek V4 Flash | DeepSeek | $0.14 | $0.28 | 1M | 384K |
| DeepSeek V4 Pro | DeepSeek | $0.435 | $0.87 | 1M | 384K |
Detailed Comparison
Gemini 3.5 Flash
$1.5 / $9
per 1M tokens
Strengths
- + Stable Gemini 3.5 Flash model
- + Multimodal inputs: text, image, video, audio, and PDF
- + Search grounding, Batch API, Flex, and context caching support
Best For
Google ecosystem apps, multimodal agents, search-grounded workflows
Context Window
1.05M
Max Output
65K
DeepSeek V4 Flash
DeepSeek
$0.14 / $0.28
per 1M tokens
Strengths
- + Much lower text API pricing
- + 1M context with very large max output
- + Extremely cheap cached input at $0.0028/M
Best For
High-volume text agents, Chinese workloads, cost-first routing
Context Window
1M
Max Output
384K
DeepSeek V4 Pro
DeepSeek
$0.435 / $0.87
per 1M tokens
Strengths
- + Official 1/4-of-original API pricing
- + Higher-capability DeepSeek V4 route
- + Still far cheaper than Gemini 3.5 Flash for text output
Best For
Cost-sensitive production workloads that need more than V4 Flash
Context Window
1M
Max Output
384K
Verdict
For pure text and agent routing, DeepSeek V4 Flash and V4 Pro are dramatically cheaper than Gemini 3.5 Flash. Gemini 3.5 Flash is the stronger fit when you need Google ecosystem integration, multimodal inputs, search grounding, Batch/Flex options, or Google AI Studio workflow compatibility.
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FAQ
Which is cheaper, Gemini 3.5 Flash or DeepSeek V4 Flash?
Gemini 3.5 Flash costs $1.5/$9 per million tokens (input/output), while DeepSeek V4 Flash costs $0.14/$0.28. DeepSeek V4 Flash is cheaper for input.
Which has a larger context window?
Gemini 3.5 Flash supports 1.05M context, while DeepSeek V4 Flash supports 1M. Larger context windows allow processing more text in a single request.
Which should I choose for my project?
For pure text and agent routing, DeepSeek V4 Flash and V4 Pro are dramatically cheaper than Gemini 3.5 Flash. Gemini 3.5 Flash is the stronger fit when you need Google ecosystem integration, multimodal inputs, search grounding, Batch/Flex options, or Google AI Studio workflow compatibility.