Updated March 26, 2026· Based on independent benchmark data
GPT-5.3 Codex (xhigh) leads in intelligence with a score of 54.0 vs 18.6.
| Metric | GPT-4o (Aug '24) | GPT-5.3 Codex (xhigh) |
|---|---|---|
| Intelligence Score | 18.6 | 54.0 |
| Coding Score | 16.6 | 53.1 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 80 tok/s | 72 tok/s |
| Latency (TTFT) | 0.56s | 83.91s |
| Input Price / 1M tokens | $2.50 | $1.75 |
| Output Price / 1M tokens | $10 | $14 |
| Context Window | N/A | N/A |
GPT-5.3 Codex (xhigh) outperforms GPT-4o (Aug '24) on the intelligence index with a score of 54.0 compared to 18.6. For coding tasks, GPT-5.3 Codex (xhigh) has the edge with a coding score of 53.1 vs 16.6.
Both models deliver similar output speeds: GPT-4o (Aug '24) at 80 tok/s and GPT-5.3 Codex (xhigh) at 72 tok/s. Time to first token is 0.56s for GPT-4o (Aug '24) 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 GPT-4o (Aug '24) costs $2.50/1M input ($10/1M output). For a typical workload of 100 requests per day at 2,000 tokens each, GPT-4o (Aug '24) 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 16.6), 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 GPT-4o (Aug '24).
GPT-4o (Aug '24) is faster, producing output at 80 tok/s compared to GPT-5.3 Codex (xhigh)'s 72 tok/s.
No, GPT-4o (Aug '24) does not support image input. Neither model supports image input.
Data last synced: March 26, 2026
| 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-4o (Aug '24) may be better for specific use cases like budget-conscious projects or speed-critical applications.