DeepSeek-V3.1 vs Grok 4 Fast: Specs & Benchmark Comparison
| Characteristic | DeepSeek-V3.1 | Grok 4 Fast |
|---|---|---|
| Company | DeepSeek | xAI |
| Release Date | January 9, 2025 | August 27, 2025 |
| Parameters | 671B | — |
| Multimodal | No | Yes |
| Context (input) | 164K | 2.0M |
| Context (output) | 164K | 30K |
| Input Price / 1M | $0.27 | $0.20 |
| Output Price / 1M | $1.00 | $0.50 |
| Average Score | 0.8 | 0.8 |
| Benchmarks | ||
| GPQA | 0.8 | 0.9 |
| SimpleQA | 0.9 | 0.9 |
Visual Benchmark Comparison
DeepSeek-V3.1
Grok 4 Fast
GPQA0.8 vs 0.9
0.8
0.9
SimpleQA0.9 vs 0.9
0.9
0.9
Verdict
Grok 4 Fast leads in 3 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: DeepSeek-V3.1 — 0.8, Grok 4 Fast — 0.8.
API Cost
Grok 4 Fast is 1.8x cheaper: input $0.20/1M vs $0.27/1M tokens.
Context Window
Grok 4 Fast supports a larger context: 2M vs 164K tokens.
Recency
Grok 4 Fast is newer: released 8/27/2025 vs 1/9/2025.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — DeepSeek-V3.1 or Grok 4 Fast?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — DeepSeek-V3.1 or Grok 4 Fast?
Grok 4 Fast is cheaper for input: $0.20 per 1M tokens vs $0.27.
Which has a larger context window — DeepSeek-V3.1 or Grok 4 Fast?
Grok 4 Fast supports a larger context: 2,000,000 tokens vs 163,840.
The DeepSeek-V3.1 and Grok 4 Fast comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the DeepSeek-V3.1 or Grok 4 Fast page. See also the complete list of AI model comparisons.