Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | DeepSeek V4 Pro (Reasoning, Max Effort) | GPT-5.5 (medium) |
|---|---|---|
| Input ($/M tokens) | $0 | $5 |
| Output ($/M tokens) | $0 | $30 |
Data from Artificial Analysis API — 12 benchmarks
DeepSeek V4 Pro (Reasoning, Max Effort) is cheaper overall. Its blended price (3:1 input/output ratio) is $0.00/M tokens vs $11.25/M for GPT-5.5 (medium).
GPT-5.5 (medium) wins 6 out of 12 benchmarks compared to 1 for DeepSeek V4 Pro (Reasoning, Max Effort). See the detailed benchmark chart above for per-category results.
Both models have comparable generation speeds.
Choose based on your priorities: DeepSeek V4 Pro (Reasoning, Max Effort) for lower cost, GPT-5.5 (medium) for stronger benchmark performance, and both have comparable speed. For latency-sensitive apps, check the TTFT comparison above.