Updated March 26, 2026· Based on independent benchmark data
GPT-5.3 Codex (xhigh) leads in intelligence with a score of 54.0 vs 48.1. GPT-5.4 mini (xhigh) is 2.3x cheaper at $0.75/1M tokens vs $1.75/1M. For speed, GPT-5.4 mini (xhigh) wins at 218 tok/s vs 72 tok/s.
| Metric | GPT-5.3 Codex (xhigh) | GPT-5.4 mini (xhigh) |
|---|---|---|
| Intelligence Score | 54.0 | 48.1 |
| Coding Score | 53.1 | 51.5 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 72 tok/s | 218 tok/s |
| Latency (TTFT) | 83.91s | 7.45s |
| Input Price / 1M tokens | $1.75 | $0.75 |
| Output Price / 1M tokens | $14 | $4.50 |
| Context Window | N/A |
GPT-5.3 Codex (xhigh) outperforms GPT-5.4 mini (xhigh) on the intelligence index with a score of 54.0 compared to 48.1. Their coding capabilities are closely matched (53.1 vs 51.5).
GPT-5.4 mini (xhigh) generates output significantly faster at 218 tok/s compared to GPT-5.3 Codex (xhigh)'s 72 tok/s, making it 3.0x faster for streaming responses. Time to first token is 7.45s for GPT-5.4 mini (xhigh) vs 83.91s for GPT-5.3 Codex (xhigh), which affects perceived responsiveness in interactive applications.
GPT-5.4 mini (xhigh) is more affordable at $0.75/1M input tokens ($4.50/1M output), while GPT-5.3 Codex (xhigh) costs $1.75/1M input ($14/1M output). That makes GPT-5.3 Codex (xhigh) 2.3x more expensive per token, which can add up significantly at scale. For a typical workload of 100 requests per day at 2,000 tokens each, GPT-5.3 Codex (xhigh) would cost approximately $10.50/month vs $4.50/month for GPT-5.4 mini (xhigh) in input costs alone.
Choose GPT-5.3 Codex (xhigh) when you need higher intelligence (54.0). Choose GPT-5.4 mini (xhigh) when you need faster output (218 tok/s), lower cost.
GPT-5.3 Codex (xhigh) scores higher on coding benchmarks (53.1 vs 51.5), making it the better choice for programming tasks.
GPT-5.4 mini (xhigh) is cheaper at $0.75/1M input tokens vs $1.75/1M for GPT-5.3 Codex (xhigh).
GPT-5.4 mini (xhigh) is faster, producing output at 218 tok/s compared to GPT-5.3 Codex (xhigh)'s 72 tok/s.
No, GPT-5.3 Codex (xhigh) does not support image input. Neither model supports image input.
Data last synced: March 26, 2026
| N/A |
| Max Output Tokens | N/A | N/A |
| Input Modalities | 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 GPT-5.4 mini (xhigh) may be better for specific use cases like budget-conscious projects or speed-critical applications.