API Cost Check
Gemini 3.5 Flash vs DeepSeek V4 Pro: cost
For a typical support chatbot, DeepSeek V4 Pro is about 2.4× cheaper than Gemini 3.5 Flash ($337 vs $810 per month). Price is only one factor: test both on your own prompts before switching.
| Gemini 3.5 Flash | DeepSeek V4 Pro | |
|---|---|---|
| Input /1M | $1.50 | $1.32 |
| Output /1M | $9.00 | $3.96 |
| Cached input /1M | $0.15 | $0.044 |
| Batch input /1M | $0.75 | — |
| Batch output /1M | $4.50 | — |
| Context window | 1,048,576 | 1,000,000 |
| Max input | 1,048,576 | 1,000,000 |
| Max output | 65,536 | 393,216 |
Monthly cost by workload
| Scenario (per month) | Gemini 3.5 Flash | DeepSeek V4 Pro |
|---|---|---|
| Customer support chatbot 5,000 req/day · 1,200 in · 400 out · cache 60% | $810 | $337 |
| RAG over documents 2,000 req/day · 8,000 in · 600 out · cache 30% | $850 | $592 |
| Coding agent 1,500 req/day · 25,000 in · 2,000 out · cache 80% | $1,282 | $693 |
| Deep reasoning 800 req/day · 3,000 in · 6,000 out · cache 20% | $1,404 | $647 |
| Batch processing 50,000 req/day · 1,500 in · 150 out · batch | $2,700 | $3,861 |