Head to head
Anthropic: Claude Opus 4.8 vs SpaceXAI: Grok 4.5
Live prices, context windows, capabilities, and measured quality — updated continuously.
Side by side
| Metric | Anthropic: Claude Opus 4.8 Anthropic | SpaceXAI: Grok 4.5 Xai |
|---|---|---|
| Input $/M tokens | $5.00 | $2.00 |
| Output $/M tokens | $25.00 | $6.00 |
| Context window | 1.0M | 500K |
| Max output | 128K | — |
| WM Score | 86 | 79 |
| Benchmark quality | 86.9 | 86.1 |
| Hosts serving it | 4 | 1 |
| Throughput (tok/s) | 69 | 45 |
| Latency (ms) | 1080 | 972 |
| Vision | ||
| Tools | ||
| Reasoning | ||
| JSON mode |
Which should you pick?
SpaceXAI: Grok 4.5 costs less per million input tokens — about 2.5× cheaper than Anthropic: Claude Opus 4.8. Anthropic: Claude Opus 4.8 scores higher on measured quality. Anthropic: Claude Opus 4.8 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.