Head to head
DeepSeek: DeepSeek V4 Pro 0423 vs OpenAI: GPT-5.5
Live prices, context windows, capabilities, and measured quality — updated continuously.
Side by side
| Metric | DeepSeek: DeepSeek V4 Pro 0423 Deepseek | OpenAI: GPT-5.5 Openai |
|---|---|---|
| Input $/M tokens | $0.660 | $5.00 |
| Output $/M tokens | $1.98 | $30.00 |
| Context window | 1.0M | 1.1M |
| Max output | 384K | 128K |
| WM Score | 86 | 84 |
| Benchmark quality | 82.5 | 86.1 |
| Hosts serving it | 18 | 3 |
| Throughput (tok/s) | 66 | 78 |
| Latency (ms) | 425 | 3491 |
| Vision | ||
| Tools | ||
| Reasoning | ||
| JSON mode |
Which should you pick?
DeepSeek: DeepSeek V4 Pro 0423 costs less per million input tokens — about 7.6× cheaper than OpenAI: GPT-5.5. OpenAI: GPT-5.5 scores higher on measured quality. OpenAI: GPT-5.5 takes a larger context window, which matters for long documents or big codebases. Prices here are live list prices; the same model can cost less on a different host, so check the model page for the cheapest offering.