Updated March 26, 2026· Based on independent benchmark data
GPT-5.3 Codex (xhigh) leads in intelligence with a score of 54.0 vs 49.8. GLM-5 (Reasoning) is 1.8x cheaper at $1.00/1M tokens vs $1.75/1M.
| Metric | GPT-5.3 Codex (xhigh) | GLM-5 (Reasoning) |
|---|---|---|
| Intelligence Score | 54.0 | 49.8 |
| Coding Score | 53.1 | 44.2 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 72 tok/s | 66 tok/s |
| Latency (TTFT) | 83.91s | 0.98s |
| Input Price / 1M tokens | $1.75 | $1.00 |
| Output Price / 1M tokens | $14 | $3.20 |
| Context Window | N/A |
GPT-5.3 Codex (xhigh) outperforms GLM-5 (Reasoning) on the intelligence index with a score of 54.0 compared to 49.8. For coding tasks, GPT-5.3 Codex (xhigh) has the edge with a coding score of 53.1 vs 44.2.
Both models deliver similar output speeds: GPT-5.3 Codex (xhigh) at 72 tok/s and GLM-5 (Reasoning) at 66 tok/s. Time to first token is 0.98s for GLM-5 (Reasoning) vs 83.91s for GPT-5.3 Codex (xhigh), which affects perceived responsiveness in interactive applications.
GLM-5 (Reasoning) is more affordable at $1.00/1M input tokens ($3.20/1M output), while GPT-5.3 Codex (xhigh) costs $1.75/1M input ($14/1M 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 $6.00/month for GLM-5 (Reasoning) in input costs alone.
Choose GPT-5.3 Codex (xhigh) when you need higher intelligence (54.0), stronger coding performance (53.1). Choose GLM-5 (Reasoning) when you need lower cost.
GPT-5.3 Codex (xhigh) scores higher on coding benchmarks (53.1 vs 44.2), making it the better choice for programming tasks.
GLM-5 (Reasoning) is cheaper at $1.00/1M input tokens vs $1.75/1M for GPT-5.3 Codex (xhigh).
GPT-5.3 Codex (xhigh) is faster, producing output at 72 tok/s compared to GLM-5 (Reasoning)'s 66 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 GLM-5 (Reasoning) may be better for specific use cases like budget-conscious projects or speed-critical applications.