Model profile / OpenAI
OpenAI's API model optimized for agentic coding tasks in Codex and similar environments.
Four areas of evidence
Mathematical and scientific problem solving.
Score includes qualified prediction of missing evidence.
Software engineering and programming.
Factual reliability and instruction following.
Score includes qualified prediction of missing evidence.
Tool use, workflows and professional tasks.
Current index snapshot · 2026-09-16. Each category uses its own scale; scores across categories are not directly comparable. Counts describe published catalogue evidence. A point lead does not establish superiority.
Performance in context
GPT-5.3-Codex has no current Capabilities rating. Explore the rated models below.
Lumina Capabilities Index
The current Capabilities cohort, with available operational measurements.
Chart loads as you explore
Lumina Capabilities Index
The current Capabilities cohort, with available operational measurements.
Chart loads as you explore
Explore the detail
Score includes qualified prediction of missing evidence.
Score includes qualified prediction of missing evidence.
| Benchmark | Result | Published configuration | Source |
|---|---|---|---|
| GPQA Diamond2026 | 91.5% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 21 July 2026 ↗Observed 2026-07-21 · checked 2026-07-21source-checked · reference-only |
| GPQA Diamond2026 | 91.5% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 2026-07-27 ↗Observed 2026-07-27 · checked 2026-07-27source-checked · reference-only |
| GPQA Diamond2026 | 91.5% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 2026-08-01 ↗Observed 2026-08-01 · checked 2026-08-01source-checked · reference-only |
| Humanity's Last Exam2026 | 39.9% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 21 July 2026 ↗Observed 2026-07-21 · checked 2026-07-21source-checked · reference-only |
| Humanity's Last Exam2026 | 39.9% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 2026-07-27 ↗Observed 2026-07-27 · checked 2026-07-27source-checked · reference-only |
| Humanity's Last Exam2026 | 39.9% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 2026-08-01 ↗Observed 2026-08-01 · checked 2026-08-01source-checked · reference-only |
| IFBench2026 | 75.4% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 21 July 2026 ↗Observed 2026-07-21 · checked 2026-07-21source-checked · reference-only |
| IFBench2026 | 75.4% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 2026-07-27 ↗Observed 2026-07-27 · checked 2026-07-27source-checked · reference-only |
| IFBench2026 | 75.4% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 2026-08-01 ↗Observed 2026-08-01 · checked 2026-08-01source-checked · reference-only |
| MMMU-Pro2026 | 78.5% | Exact BenchLM registry variant GPT-5.3 Codex; bulk export does not retain a complete upstream harness configuration.Source-native system | BenchLM public datasets — 21 July 2026 ↗Observed 2026-07-21 · checked 2026-07-21source-checked · reference-only |
