OpenAI
GPT-5.3 Codex (xhigh)
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
Introducing GPT-5Model Snapshot
ReleaseFeb 5, 2026
Context400,000
Overall
Rank #34 across 566
44.3
Coding
No rank
n/a
Blended Price
Rank #308 across 371
$4.81/M
Strength Profile
Percentile score by analysis domain.
* Cost is inverted: lower input, output, and blended prices rank higher.
Benchmark Percentiles
Higher bars mean stronger relative placement.
Model Details
Runtime
Output Speed95.4 tok/s
First Token67.02s
Max Output128,000
Pricing
Blended$4.81/M
Input$1.75/M
All Benchmarks
| Metric | Domain | Value | Rank |
|---|---|---|---|
| Artificial Analysis Intelligence Index | overall | 44.3 | #34 |
| GPQA | reasoning | 91.5% | #18 |
| Humanity's Last Exam | reasoning | 39.9% | #17 |
| SciCode | coding, reasoning | 53.2% | #21 |
| Output Speed |