Model comparison
GPT-5.3 Codex vs phi-3-medium 14B
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 29.7 on the Noometry Index.
Last verified . 1 shared benchmarks.
MicrosoftSummary
- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 1 category and phi-3-medium 14B in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 36.8.
- phi-3-medium 14B has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Codex | phi-3-medium 14B | |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 45.8 | 29.7 |
| Released | 2026-02-05 | 2024-04-23 |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 8 | 13 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.6 (#56), phi-3-medium 14B: 36.8 (#201)
| Benchmark | GPT-5.3 Codex | phi-3-medium 14B |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1409 | — |
| WeirdML | 79.3% | — |
| BigCodeBench Instruct | — | 37.6% |
| BigCodeBench Complete | — | 48.7% |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#9), phi-3-medium 14B: —
| Benchmark | GPT-5.3 Codex | phi-3-medium 14B |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, phi-3-medium 14B: —
| Benchmark | GPT-5.3 Codex | phi-3-medium 14B |
|---|---|---|
| Epoch Capabilities Index | 156.77 | 121.23 |
| Adversarial NLI | — | 55.8% |
| BIG-Bench Hard | — | 81.4% |
| HellaSwag | — | 82.4% |
| WinoGrande | — | 81.5% |
Math Not comparable
GPT-5.3 Codex: —, phi-3-medium 14B: 27.3 (#250)
| Benchmark | GPT-5.3 Codex | phi-3-medium 14B |
|---|---|---|
| MATH Level 5 | — | 17.6% |
Knowledge Not comparable
GPT-5.3 Codex: —, phi-3-medium 14B: 9.1 (#306)
| Benchmark | GPT-5.3 Codex | phi-3-medium 14B |
|---|---|---|
| GPQA Diamond | — | 27.6% |
| ARC (AI2) Challenge | — | 91.6% |
| MMLU | — | 78% |
| OpenBookQA | — | 87.4% |
| TriviaQA | — | 73.9% |
Frequently asked questions
Is GPT-5.3 Codex better than phi-3-medium 14B?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 29.7 on the Noometry Index.
Is GPT-5.3 Codex or phi-3-medium 14B better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 36.8 in the Noometry coding category.
How many benchmarks do GPT-5.3 Codex and phi-3-medium 14B share?
1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and phi-3-medium 14B has 13.