Updated March 26, 2026· Based on independent benchmark data
GPT-5.3 Codex (xhigh) leads in intelligence with a score of 54.0 vs 19.0.
| Metric | Nova Premier | GPT-5.3 Codex (xhigh) |
|---|---|---|
| Intelligence Score | 19.0 | 54.0 |
| Coding Score | 13.8 | 53.1 |
| Math Score | 17.3 | N/A |
| Speed (tok/s) | 65 tok/s | 72 tok/s |
| Latency (TTFT) | 0.88s | 83.91s |
| Input Price / 1M tokens | $2.50 | $1.75 |
| Output Price / 1M tokens | $13 | $14 |
| Context Window | 1M | N/A |
GPT-5.3 Codex (xhigh) outperforms Nova Premier on the intelligence index with a score of 54.0 compared to 19.0. For coding tasks, GPT-5.3 Codex (xhigh) has the edge with a coding score of 53.1 vs 13.8.
Both models deliver similar output speeds: Nova Premier at 65 tok/s and GPT-5.3 Codex (xhigh) at 72 tok/s. Time to first token is 0.88s for Nova Premier 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 Nova Premier costs $2.50/1M input ($13/1M output). For a typical workload of 100 requests per day at 2,000 tokens each, Nova Premier would cost approximately $15.00/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).
GPT-5.3 Codex (xhigh) scores higher on coding benchmarks (53.1 vs 13.8), making it the better choice for programming tasks.
GPT-5.3 Codex (xhigh) is cheaper at $1.75/1M input tokens vs $2.50/1M for Nova Premier.
GPT-5.3 Codex (xhigh) is faster, producing output at 72 tok/s compared to Nova Premier's 65 tok/s.
Yes, Nova Premier 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 | Text + Image | 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 Nova Premier may be better for specific use cases like budget-conscious projects or speed-critical applications.