DeepSeek V4-Pro vs Grok 4.1 Fast
Detailed pricing comparison and cost analysis.
Updated September 2026
Cost Simulator
| Feature | DeepSeek V4-Pro | Grok 4.1 Fast |
|---|---|---|
| Provider | DeepSeek | xAI |
| Input Price (1M) | $1.32 | $0.20 |
| Output Price (1M) | $3.96 | $0.50 |
| Context Window | 1,000,000 | 2,000,000 |
Verdict
DeepSeek V4-Pro costs $1.32 per 1M input tokens and $3.96 per 1M output tokens. Grok 4.1 Fast costs $0.20 per 1M input tokens and $0.50 per 1M output tokens. Grok 4.1 Fast is 85% cheaper on input tokens than DeepSeek V4-Pro. For output tokens, Grok 4.1 Fast is the more affordable option at $0.50/1M vs $3.96.
On context window, Grok 4.1 Fast supports 2,000,000 tokens — meaning it can fit more conversation history, documents, or code in a single request. This matters for RAG pipelines, long document analysis, and agentic workflows where context builds up over many turns.
When to choose DeepSeek V4-Pro
- ✓ You are already integrated with DeepSeek
When to choose Grok 4.1 Fast
- ✓ You need the lowest input token cost ($ 0.20/1M)
- ✓ Your workload is output-heavy — Grok 4.1 Fast generates text cheaper
- ✓ You need a larger context window (2,000,000 tokens)
- ✓ You are already integrated with xAI
Use the calculator above to simulate your specific workload and find the exact break-even point. For most applications, the cheapest model is the one that minimises your total monthly bill given your input-to-output token ratio.
Frequently Asked Questions
Is DeepSeek V4-Pro cheaper than Grok 4.1 Fast? ▼
Grok 4.1 Fast is cheaper on input tokens at $0.20/1M vs $1.32/1M for DeepSeek V4-Pro — a 85% saving.
What is the context window of DeepSeek V4-Pro vs Grok 4.1 Fast? ▼
DeepSeek V4-Pro has a 1,000,000-token context window. Grok 4.1 Fast has a 2,000,000-token context window. Grok 4.1 Fast supports the larger context, suitable for longer documents and agentic workflows.
Which model is better: DeepSeek V4-Pro or Grok 4.1 Fast? ▼
The best choice depends on your use case. For cost efficiency on input tokens, Grok 4.1 Fast is the cheaper option. For maximum context length, Grok 4.1 Fast supports 2,000,000 tokens. Use the comparison table above to find the right fit for your workload.