Side-by-side comparison · models
GPT-5.1 (2025-11-13) vs GPT-5 Codex
What we have checked about each, line by line. Every value shows where it came from and when we last confirmed it.
Models
GPT-5.1 (2025-11-13)
GPT model for general reasoning, writing, coding, and tool-assisted tasks.
Models
GPT-5 Codex
GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows.
Checked facts
Line by line
| Measure | GPT-5.1 (2025-11-13) | GPT-5 Codex |
|---|---|---|
| Time to first token (ms) | 33,760 | 8,380 |
| Output speed (tokens a second) | 106.7 | 165.7 |
| Artificial Analysis Intelligence Index | Not checked yet | 24.9 |
| Terminal bench | Not checked yet | 44.3% (for 15 Sept 2025) |
| Weirdml | Not checked yet | 54.5% (for 15 Sept 2025) |
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