DeepSeek-V4-Flash-0731 vs Grok 4.5: Specs & Benchmark Comparison
DeepSeek-V4-Flash-0731 is developed by DeepSeek, while Grok 4.5 comes from xAI. Both were released in July 2026. DeepSeek-V4-Flash-0731 has a published size of about 304 billion parameters; xAI has not disclosed the parameter count of Grok 4.5.
The two models share 2 published benchmarks. DeepSeek-V4-Flash-0731 leads on 1 of them. The widest gaps are on DeepSWE, where DeepSeek-V4-Flash-0731 scores 54.4% against 53.0%; Terminal-Bench 2.1, where Grok 4.5 scores 83.0% against 83.0%. Averaged across everything we track, DeepSeek-V4-Flash-0731 sits at 57.5% and Grok 4.5 at 52.9%.
DeepSeek-V4-Flash-0731 is the cheaper API at $0.14 per million input tokens and $0.28 per million output tokens, roughly 14 times cheaper than Grok 4.5 at $2 and $6. DeepSeek-V4-Flash-0731 takes the larger context window at 1M tokens, compared with 500K for Grok 4.5. DeepSeek-V4-Flash-0731 accepts text as input, while Grok 4.5 accepts text and images.
| Characteristic | DeepSeek-V4-Flash-0731 | Grok 4.5 |
|---|---|---|
| Company | DeepSeek | xAI |
| Release Date | July 31, 2026 | July 16, 2026 |
| Parameters | 304B | — |
| Multimodal | No | Yes |
| Context (input) | 1.0M | 500K |
| Context (output) | 393K | — |
| Input Price / 1M | $0.14 | $2.00 |
| Output Price / 1M | $0.28 | $6.00 |
| Average Score | 57.5% | 52.9% |
| Benchmarks | ||
| DeepSWE | 54.4% | 53.0% |
| Terminal-Bench 2.1 | 83.0% | 83.0% |
Visual Benchmark Comparison
Verdict
DeepSeek-V4-Flash-0731 leads in 3 out of 4 comparison categories.
Both models show comparable average scores: DeepSeek-V4-Flash-0731 — 0.6, Grok 4.5 — 0.5.
DeepSeek-V4-Flash-0731 is 19.0x cheaper: input $0.14/1M vs $2.00/1M tokens.
DeepSeek-V4-Flash-0731 supports a larger context: 1M vs 500K tokens.
DeepSeek-V4-Flash-0731 is newer: released 7/31/2026 vs 7/16/2026.
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Frequently Asked Questions
Which is better for coding — DeepSeek-V4-Flash-0731 or Grok 4.5?
Which model is cheaper — DeepSeek-V4-Flash-0731 or Grok 4.5?
Which has a larger context window — DeepSeek-V4-Flash-0731 or Grok 4.5?
The DeepSeek-V4-Flash-0731 and Grok 4.5 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the DeepSeek-V4-Flash-0731 or Grok 4.5 page. See also the complete list of AI model comparisons.