Gemini 3 Flash Preview vs DeepSeek Chat V3.1: cost comparison
Prices updated 2026-10-28 · computed from live provider data
Short answer: DeepSeek Chat V3.1 is cheaper on a
3:1 input/output blend — $0.425 per million tokens versus
$0.562, a 24% difference.
Gemini 3 Flash Preview offers the larger context window at 1,048,576 tokens, against 163,840 for DeepSeek Chat V3.1.
Head to head
| Gemini 3 Flash Preview | DeepSeek Chat V3.1 | |
|---|---|---|
| Input, per 1M tokens | $0.250 | $0.250 |
| Output, per 1M tokens | $1.50 | $0.950 |
| Blended 3:1, per 1M | $0.562 | $0.425 |
| Context window | 1,048,576 | 163,840 |
| Vendor | deepseek |
Monthly cost at real volumes
| Workload (input / output) | Gemini 3 Flash Preview | DeepSeek Chat V3.1 |
|---|---|---|
| 1M in / 250K out | $0.625 | $0.487 |
| 10M in / 2.5M out | $6.25 | $4.88 |
| 100M in / 25M out | $62.50 | $48.75 |
Which should you pick?
Pick Gemini 3 Flash Preview when you need the longer context window (1,048,576 vs 163,840 tokens). Pick DeepSeek Chat V3.1 when price per token dominates your workload — high-volume classification, extraction, or batch summarisation.