DeepSeek V4 Flash vs Grok 4.1 Fast
DeepSeek against xAI, costed on the same three workloads. DeepSeek V4 Flash is cheaper on all three workloads.
Monthly bill, side by side
| Workload | DeepSeek V4 Flash | Grok 4.1 Fast | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$394 | $603 | $209 (1.5×) |
| Document summariser 1,000 single-shot summaries a day |
$57.96 | $85.20 | $27.24 (+47%) |
| Coding agent 200 twelve-turn sessions a day |
$318 | $472 | $154 (+49%) |
No prompt caching and no batch discount on either side, so the comparison is like for like. Both figures assume 30 days a month.
The rate cards
| DeepSeek V4 Flash | Grok 4.1 Fast | |
|---|---|---|
| Input, per 1M tokens | $0.14 | $0.2 |
| Output, per 1M tokens | $0.28 | $0.5 |
| Cached input | $0.0028 | $0.05 |
| Context window | 1M | 2M |
| Maximum output | 8K | 2M |
| Reasoning model | yes | yes |
| Vision | no | yes |
Run this comparison on your own numbers
Full detail: DeepSeek V4 Flash pricing · Grok 4.1 Fast pricing