DeepSeek-V4-Pro-0813 vs GPT-5.1 Medium: Specs & Benchmark Comparison
DeepSeek-V4-Pro-0813 is developed by DeepSeek, while GPT-5.1 Medium comes from OpenAI. GPT-5.1 Medium was released in November 2025, and DeepSeek-V4-Pro-0813 followed 9 months later in August 2026. DeepSeek-V4-Pro-0813 has a published size of about 1.6 trillion parameters; OpenAI has not disclosed the parameter count of GPT-5.1 Medium.
We have 12 benchmark results for DeepSeek-V4-Pro-0813 and 1 benchmark result for GPT-5.1 Medium, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
GPT-5.1 Medium is the cheaper API at $1 per million input tokens and $4 per million output tokens, about 32% below DeepSeek-V4-Pro-0813 at $1.32 and $3.96. DeepSeek-V4-Pro-0813 takes the larger context window at 1M tokens, compared with 256K for GPT-5.1 Medium. DeepSeek-V4-Pro-0813 accepts text as input, while GPT-5.1 Medium accepts text and images.
| Characteristic | DeepSeek-V4-Pro-0813 | GPT-5.1 Medium |
|---|---|---|
| Company | DeepSeek | OpenAI |
| Release Date | August 13, 2026 | November 11, 2025 |
| Parameters | 1.6T | — |
| Multimodal | No | Yes |
| Context (input) | 1.0M | 256K |
| Context (output) | 393K | 64K |
| Input Price / 1M | $1.32 | $1.00 |
| Output Price / 1M | $3.96 | $4.00 |
| Average Score | 60.6% | 98.0% |
Verdict
DeepSeek-V4-Pro-0813 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: DeepSeek-V4-Pro-0813 — 0.6, GPT-5.1 Medium — 1.0.
GPT-5.1 Medium is 1.1x cheaper: input $1.00/1M vs $1.32/1M tokens.
DeepSeek-V4-Pro-0813 supports a larger context: 1M vs 256K tokens.
DeepSeek-V4-Pro-0813 is newer: released 8/13/2026 vs 11/11/2025.
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Frequently Asked Questions
Which is better for coding — DeepSeek-V4-Pro-0813 or GPT-5.1 Medium?
Which model is cheaper — DeepSeek-V4-Pro-0813 or GPT-5.1 Medium?
Which has a larger context window — DeepSeek-V4-Pro-0813 or GPT-5.1 Medium?
The DeepSeek-V4-Pro-0813 and GPT-5.1 Medium 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-Pro-0813 or GPT-5.1 Medium page. See also the complete list of AI model comparisons.