Updated March 26, 2026· Based on independent benchmark data
GPT-5.3 Codex (xhigh) leads in intelligence with a score of 54.0 vs 41.5. GPT-5.3 Codex (xhigh) is 1.7x cheaper at $1.75/1M tokens vs $3.00/1M. For speed, GPT-5.3 Codex (xhigh) wins at 72 tok/s vs 44 tok/s.
| Metric | Grok 4 | GPT-5.3 Codex (xhigh) |
|---|---|---|
| Intelligence Score | 41.5 | 54.0 |
| Coding Score | 40.5 | 53.1 |
| Math Score | 92.7 | N/A |
| Speed (tok/s) | 44 tok/s | 72 tok/s |
| Latency (TTFT) | 8.55s | 83.91s |
| Input Price / 1M tokens | $3.00 | $1.75 |
| Output Price / 1M tokens | $15 | $14 |
| Context Window | 256K | N/A |
GPT-5.3 Codex (xhigh) outperforms Grok 4 on the intelligence index with a score of 54.0 compared to 41.5. For coding tasks, GPT-5.3 Codex (xhigh) has the edge with a coding score of 53.1 vs 40.5.
GPT-5.3 Codex (xhigh) generates output significantly faster at 72 tok/s compared to Grok 4's 44 tok/s, making it 1.7x faster for streaming responses. Time to first token is 8.55s for Grok 4 vs 83.91s for GPT-5.3 Codex (xhigh), which affects perceived responsiveness in interactive applications.
GPT-5.3 Codex (xhigh) is more affordable at $1.75/1M input tokens ($14/1M output), while Grok 4 costs $3.00/1M input ($15/1M output). For a typical workload of 100 requests per day at 2,000 tokens each, Grok 4 would cost approximately $18.00/month vs $10.50/month for GPT-5.3 Codex (xhigh) in input costs alone.
Choose GPT-5.3 Codex (xhigh) when you need higher intelligence (54.0), stronger coding performance (53.1), faster output (72 tok/s), lower cost.
GPT-5.3 Codex (xhigh) scores higher on coding benchmarks (53.1 vs 40.5), making it the better choice for programming tasks.
GPT-5.3 Codex (xhigh) is cheaper at $1.75/1M input tokens vs $3.00/1M for Grok 4.
GPT-5.3 Codex (xhigh) is faster, producing output at 72 tok/s compared to Grok 4's 44 tok/s.
Yes, Grok 4 supports image input. GPT-5.3 Codex (xhigh) does not support image input.
Data last synced: March 26, 2026
| Max Output Tokens | N/A | N/A |
| Input Modalities | Image + Text | Text |
| Output Modalities | Text | Text |
| Free Tier | No | No |
It depends on your priorities. GPT-5.3 Codex (xhigh) scores higher on intelligence (54.0), but Grok 4 may be better for specific use cases like budget-conscious projects or speed-critical applications.