Updated March 26, 2026· Based on independent benchmark data
Gemini 3.1 Pro Preview leads in intelligence with a score of 57.2 vs 54.0. For speed, Gemini 3.1 Pro Preview wins at 113 tok/s vs 72 tok/s.
| Metric | GPT-5.3 Codex (xhigh) | Gemini 3.1 Pro Preview |
|---|---|---|
| Intelligence Score | 54.0 | 57.2 |
| Coding Score | 53.1 | 55.5 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 72 tok/s | 113 tok/s |
| Latency (TTFT) | 83.91s | 23.84s |
| Input Price / 1M tokens | $1.75 | $2.00 |
| Output Price / 1M tokens | $14 | $12 |
| Context Window | N/A |
Gemini 3.1 Pro Preview outperforms GPT-5.3 Codex (xhigh) on the intelligence index with a score of 57.2 compared to 54.0. For coding tasks, Gemini 3.1 Pro Preview has the edge with a coding score of 55.5 vs 53.1.
Gemini 3.1 Pro Preview generates output significantly faster at 113 tok/s compared to GPT-5.3 Codex (xhigh)'s 72 tok/s, making it 1.6x faster for streaming responses. Time to first token is 23.84s for Gemini 3.1 Pro Preview 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 Gemini 3.1 Pro Preview costs $2.00/1M input ($12/1M output). 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 $12.00/month for Gemini 3.1 Pro Preview in input costs alone.
Choose Gemini 3.1 Pro Preview when you need higher intelligence (57.2), stronger coding performance (55.5), faster output (113 tok/s).
Gemini 3.1 Pro Preview scores higher on coding benchmarks (55.5 vs 53.1), making it the better choice for programming tasks.
GPT-5.3 Codex (xhigh) is cheaper at $1.75/1M input tokens vs $2.00/1M for Gemini 3.1 Pro Preview.
Gemini 3.1 Pro Preview is faster, producing output at 113 tok/s compared to GPT-5.3 Codex (xhigh)'s 72 tok/s.
No, GPT-5.3 Codex (xhigh) does not support image input. However, Gemini 3.1 Pro Preview does support images.
Data last synced: March 26, 2026
| 1.0M |
| Max Output Tokens | N/A | N/A |
| Input Modalities | Text | Audio + File + Image + Text + Video |
| Output Modalities | Text | Text |
| Free Tier | No | No |
It depends on your priorities. Gemini 3.1 Pro Preview scores higher on intelligence (57.2), but GPT-5.3 Codex (xhigh) may be better for specific use cases like budget-conscious projects or speed-critical applications.