Model comparison
DeepSeek V4 Flash 0731 vs Grok Build 0.1
DeepSeek V4 Flash 0731 (DeepSeek) and Grok Build 0.1 (xAI) side by side: what each costs per million tokens through Rapid Router, how much context each takes, what each supports, and where independent benchmarks place them. Same API, same key; switching is a one-string change.
| DeepSeek V4 Flash 0731 | Grok Build 0.1 | |
|---|---|---|
| Input price per 1M | $0.060 | $1.00 |
| Output price per 1M | $0.180 | $2.00 |
| Context window | 1M tokens | 256K tokens |
| Max output | 944K tokens | 256K tokens |
| Input types | text | text, image, pdf |
| Capabilities | tools, JSON, reasoning | tools, JSON, vision, reasoning |
| Author | DeepSeek | xAI |
What a month costs on each
| Workload | DeepSeek V4 Flash 0731 | Grok Build 0.1 |
|---|---|---|
| Chatbot month (15M in, 4M out) | $1.62 | $23.00 |
| RAG month (40M in, 3M out) | $2.94 | $46.00 |
| Coding month (60M in, 10M out) | $5.40 | $80.00 |
On a typical 75/25 input-output mix, DeepSeek V4 Flash 0731 costs less (about 93% less than Grok Build 0.1). DeepSeek V4 Flash 0731 takes the longer prompt at 1M tokens. Try your own numbers in the cost calculator.
Call either one
curl https://rapidrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $RAPIDROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "deepseek/deepseek-v4-flash-0731", "messages": [{"role": "user", "content": "Hello"}]}'
# the other one: change the model string
-d '{"model": "x-ai/grok-build-0.1", ...}'Common questions
Which is cheaper, DeepSeek V4 Flash 0731 or Grok Build 0.1?
DeepSeek V4 Flash 0731 is cheaper on a typical mix of 75% input and 25% output tokens, by about 93%. Through Rapid Router both are billed at the provider list price per million tokens.
Which has the larger context window?
DeepSeek V4 Flash 0731, at 1M tokens. Grok Build 0.1 offers 256K tokens.
Can I switch between DeepSeek V4 Flash 0731 and Grok Build 0.1 without changing code?
Yes. Both are callable at https://rapidrouter.ai/api/v1 with the same OpenAI-compatible request; only the model string changes (deepseek/deepseek-v4-flash-0731 or x-ai/grok-build-0.1).
How do I pay for DeepSeek V4 Flash 0731 or Grok Build 0.1?
Top up a Rapid Router balance by card in US dollars, and both models debit that balance per request.
More DeepSeek models: DeepSeek API pricing · More Grok: xAI API pricing