Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | GPT-5.3 Codex (xhigh) | Claude 3.5 Sonnet (June '24) |
|---|---|---|
| Input ($/M tokens) | $1.75 | $3 |
| Output ($/M tokens) | $14 | $15 |
Data from Artificial Analysis API — 12 benchmarks
GPT-5.3 Codex (xhigh) is cheaper overall. Its blended price (3:1 input/output ratio) is $4.81/M tokens vs $6.00/M for Claude 3.5 Sonnet (June '24).
GPT-5.3 Codex (xhigh) wins 7 out of 12 benchmarks compared to 2 for Claude 3.5 Sonnet (June '24). See the detailed benchmark chart above for per-category results.
GPT-5.3 Codex (xhigh) generates tokens faster at 81 tok/s vs 0 tok/s. However, Claude 3.5 Sonnet (June '24) has lower time-to-first-token (0.00s vs 68.19s).
Choose based on your priorities: GPT-5.3 Codex (xhigh) for lower cost, GPT-5.3 Codex (xhigh) for stronger benchmark performance, and GPT-5.3 Codex (xhigh) for faster generation. For latency-sensitive apps, check the TTFT comparison above.