Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Grok 4 | GPT-5.5 (high) |
|---|---|---|
| Input ($/M tokens) | $5.5 | $5 |
| Output ($/M tokens) | $27.5 | $30 |
Data from Artificial Analysis API — 12 benchmarks
Grok 4 is cheaper overall. Its blended price (3:1 input/output ratio) is $11.00/M tokens vs $11.25/M for GPT-5.5 (high).
GPT-5.5 (high) wins 7 out of 12 benchmarks compared to 5 for Grok 4. See the detailed benchmark chart above for per-category results.
GPT-5.5 (high) generates tokens faster at 63 tok/s vs 0 tok/s. Grok 4 also has lower time-to-first-token (0.00s vs 22.85s).
Choose based on your priorities: Grok 4 for lower cost, GPT-5.5 (high) for stronger benchmark performance, and GPT-5.5 (high) for faster generation. For latency-sensitive apps, check the TTFT comparison above.