Head to head
OpenAI: GPT-5.4 vs OpenAI: GPT-5.5
Live prices, context windows, capabilities, and measured quality — updated continuously.
Side by side
| Metric | OpenAI: GPT-5.4 Openai | OpenAI: GPT-5.5 Openai |
|---|---|---|
| Input $/M tokens | $1.25 | $5.00 |
| Output $/M tokens | $7.50 | $30.00 |
| Context window | 1.1M | 1.1M |
| Max output | 128K | 128K |
| WM Score | 85 | 80 |
| Benchmark quality | 84 | 78.6 |
| Hosts serving it | 3 | 3 |
| Throughput (tok/s) | 61 | 187 |
| Latency (ms) | 1790 | 1356 |
| Vision | ||
| Tools | ||
| Reasoning | ||
| JSON mode |
Which should you pick?
OpenAI: GPT-5.4 costs less per million input tokens — about 4.0× cheaper than OpenAI: GPT-5.5. OpenAI: GPT-5.4 scores higher on measured quality. 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.