Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Claude Opus 4.5 (Reasoning) | Grok 3 |
|---|---|---|
| Input ($/M tokens) | $5 | $3 |
| Output ($/M tokens) | $25 | $15 |
Data from Artificial Analysis API — 12 benchmarks
Grok 3 is cheaper overall. Its blended price (3:1 input/output ratio) is $6.00/M tokens vs $10.00/M for Claude Opus 4.5 (Reasoning).
Claude Opus 4.5 (Reasoning) wins 11 out of 12 benchmarks compared to 1 for Grok 3. See the detailed benchmark chart above for per-category results.
Grok 3 generates tokens faster at 69 tok/s vs 51 tok/s. However, Grok 3 has lower time-to-first-token (0.37s vs 10.39s).
Choose based on your priorities: Grok 3 for lower cost, Claude Opus 4.5 (Reasoning) for stronger benchmark performance, and Grok 3 for faster generation. For latency-sensitive apps, check the TTFT comparison above.