DeepSeek V4 Flash 0731 vs Gemini 3.1 Pro Preview
For a typical chat reply (2,000 tokens in, 400 out), Gemini 3.1 Pro Preview costs 52× as much as DeepSeek V4 Flash 0731: $8.80 against $0.17 per 1,000 requests at list price on 2026-09-28.
| DeepSeek V4 Flash 0731 | Gemini 3.1 Pro Preview | |
|---|---|---|
| Input, per 1M tokens | $0.021 | $2.00 |
| Output, per 1M tokens | $0.32 | $12.00 |
| Context window | 1.31M | 1.05M |
| Classification or routing (600 tokens in, 10 out), per 1,000 | $0.0158 | $1.32 |
| Chat reply (2,000 in, 400 out), per 1,000 | $0.17 | $8.80 |
| Retrieval-augmented answer (8,000 in, 500 out), per 1,000 | $0.328 | $22.00 |
| Confidence signal | yes | no |
| Tool calling | yes | yes |
| BANKING77, correct of 400 | 298 | not measured |
Which one should carry your traffic?
If DeepSeek V4 Flash 0731 answers your requests as well as Gemini 3.1 Pro Preview, moving that traffic saves 98% on chat-shaped requests. Averages cannot tell you whether it does for your requests. DeepSeek V4 Flash 0731 exposes a confidence signal, so Gimbix can let it answer first and hand unsure cases to Gemini 3.1 Pro Preview.
DeepSeek V4 Flash 0731 profile · Gemini 3.1 Pro Preview profile · Measure it on your traffic