DeepSeek-V4-Flash-0731 vs GPT-5.1 Codex High: Specs & Benchmark Comparison
DeepSeek-V4-Flash-0731 is developed by DeepSeek, while GPT-5.1 Codex High comes from OpenAI. GPT-5.1 Codex High was released in November 2025, and DeepSeek-V4-Flash-0731 followed 8 months later in July 2026. DeepSeek-V4-Flash-0731 has a published size of about 304 billion parameters; OpenAI has not disclosed the parameter count of GPT-5.1 Codex High.
We have 9 benchmark results for DeepSeek-V4-Flash-0731 and 1 benchmark result for GPT-5.1 Codex High, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
DeepSeek-V4-Flash-0731 is the cheaper API at $0.14 per million input tokens and $0.28 per million output tokens, roughly 9 times cheaper than GPT-5.1 Codex High at $1.25 and $10. DeepSeek-V4-Flash-0731 takes the larger context window at 1M tokens, compared with 400K for GPT-5.1 Codex High. DeepSeek-V4-Flash-0731 accepts text as input, while GPT-5.1 Codex High accepts text and images.
| Characteristic | DeepSeek-V4-Flash-0731 | GPT-5.1 Codex High |
|---|---|---|
| Company | DeepSeek | OpenAI |
| Release Date | July 31, 2026 | November 11, 2025 |
| Parameters | 304B | — |
| Multimodal | No | Yes |
| Context (input) | 1.0M | 400K |
| Context (output) | 393K | 128K |
| Input Price / 1M | $0.14 | $1.25 |
| Output Price / 1M | $0.28 | $10.00 |
| Average Score | 57.5% | 97.0% |
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, GPT-5.1 Codex High — 1.0.
DeepSeek-V4-Flash-0731 is 26.8x cheaper: input $0.14/1M vs $1.25/1M tokens.
DeepSeek-V4-Flash-0731 supports a larger context: 1M vs 400K tokens.
DeepSeek-V4-Flash-0731 is newer: released 7/31/2026 vs 11/11/2025.
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Frequently Asked Questions
Which is better for coding — DeepSeek-V4-Flash-0731 or GPT-5.1 Codex High?
Which model is cheaper — DeepSeek-V4-Flash-0731 or GPT-5.1 Codex High?
Which has a larger context window — DeepSeek-V4-Flash-0731 or GPT-5.1 Codex High?
The DeepSeek-V4-Flash-0731 and GPT-5.1 Codex High 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 GPT-5.1 Codex High page. See also the complete list of AI model comparisons.