Head to head
SpaceXAI: Grok 4.5 vs OpenAI: GPT-5.4
Live prices, context windows, capabilities, and measured quality — updated continuously.
Side by side
| Metric | SpaceXAI: Grok 4.5 Xai | OpenAI: GPT-5.4 Openai |
|---|---|---|
| Input $/M tokens | $2.00 | $2.50 |
| Output $/M tokens | $6.00 | $15.00 |
| Context window | 500K | 1.1M |
| Max output | — | 128K |
| WM Score | 79 | 82 |
| Benchmark quality | 86.1 | 80.9 |
| Hosts serving it | 1 | 3 |
| Throughput (tok/s) | 45 | 54 |
| Latency (ms) | 972 | 560 |
| Vision | ||
| Tools | ||
| Reasoning | ||
| JSON mode |
Which should you pick?
SpaceXAI: Grok 4.5 costs less per million input tokens — about 1.3× cheaper than OpenAI: GPT-5.4. SpaceXAI: Grok 4.5 scores higher on measured quality. OpenAI: GPT-5.4 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.