Updated March 26, 2026· Based on independent benchmark data
GPT-5.3 Codex (xhigh) leads in intelligence with a score of 54.0 vs 30.8. GPT-5.3 Codex (xhigh) is 8.6x cheaper at $1.75/1M tokens vs $15/1M. For speed, o1 wins at 96 tok/s vs 72 tok/s.
| Metric | o1 | GPT-5.3 Codex (xhigh) |
|---|---|---|
| Intelligence Score | 30.8 | 54.0 |
| Coding Score | 20.5 | 53.1 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 96 tok/s | 72 tok/s |
| Latency (TTFT) | 21.19s | 83.91s |
| Input Price / 1M tokens | $15 | $1.75 |
| Output Price / 1M tokens | $60 | $14 |
| Context Window | 200K | N/A |
GPT-5.3 Codex (xhigh) outperforms o1 on the intelligence index with a score of 54.0 compared to 30.8. For coding tasks, GPT-5.3 Codex (xhigh) has the edge with a coding score of 53.1 vs 20.5.
o1 generates output significantly faster at 96 tok/s compared to GPT-5.3 Codex (xhigh)'s 72 tok/s, making it 1.3x faster for streaming responses. Time to first token is 21.19s for o1 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 o1 costs $15/1M input ($60/1M output). That makes o1 8.6x 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, o1 would cost approximately $90.00/month vs $10.50/month for GPT-5.3 Codex (xhigh) in input costs alone.
Choose o1 when you need faster output (96 tok/s). Choose GPT-5.3 Codex (xhigh) when you need higher intelligence (54.0), stronger coding performance (53.1), lower cost.
GPT-5.3 Codex (xhigh) scores higher on coding benchmarks (53.1 vs 20.5), making it the better choice for programming tasks.
GPT-5.3 Codex (xhigh) is cheaper at $1.75/1M input tokens vs $15/1M for o1.
o1 is faster, producing output at 96 tok/s compared to GPT-5.3 Codex (xhigh)'s 72 tok/s.
Yes, o1 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 + File | 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 o1 may be better for specific use cases like budget-conscious projects or speed-critical applications.