Model comparison
GPT-5.3 Codex vs Phi 3 Mini 4k Instruct
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 27.4 on the Noometry Index.
Last verified . 0 shared benchmarks.
MicrosoftSummary
- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 26.1.
- Phi 3 Mini 4k Instruct has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Codex | Phi 3 Mini 4k Instruct | |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 45.5 | 27.4 |
| 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 | 35 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.5 (#51), Phi 3 Mini 4k Instruct: 26.1 (#319)
| Benchmark | GPT-5.3 Codex | Phi 3 Mini 4k Instruct |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1408 | — |
| WeirdML | 79.3% | — |
| LiveBench Coding | — | 15.5% |
| LMArena Coding | — | 1093 |
| ALE-Bench | 1,655 | — |
| HumanEval+ | — | 59.1% |
| MBPP+ | — | 54.2% |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 47.8 (#9), Phi 3 Mini 4k Instruct: —
| Benchmark | GPT-5.3 Codex | Phi 3 Mini 4k Instruct |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Phi 3 Mini 4k Instruct: 13.6 (#326)
| Benchmark | GPT-5.3 Codex | Phi 3 Mini 4k Instruct |
|---|---|---|
| Chess Puzzles | — | 0% |
| LiveBench Reasoning | — | 26.8% |
| LMArena Hard Prompts | — | 1072 |
| LiveBench Data Analysis | — | 34.7% |
| Adversarial NLI | — | 52.8% |
| BIG-Bench Hard | — | 71.7% |
| Epoch Capabilities Index | 156.84 | — |
| HellaSwag | — | 76.7% |
| LiveBench | — | 22.4% |
| WinoGrande | — | 70.8% |
Math Not comparable
GPT-5.3 Codex: —, Phi 3 Mini 4k Instruct: 24.5 (#258)
| Benchmark | GPT-5.3 Codex | Phi 3 Mini 4k Instruct |
|---|---|---|
| LiveBench Math | — | 15.7% |
| LMArena Math | — | 1111 |
Knowledge Not comparable
GPT-5.3 Codex: —, Phi 3 Mini 4k Instruct: 27.9 (#241)
| Benchmark | GPT-5.3 Codex | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Expert | — | 1045 |
| ARC (AI2) Challenge | — | 84.9% |
| MMLU | — | 68.8% |
| OpenBookQA | — | 88% |
| TriviaQA | — | 64% |
Multilingual Not comparable
GPT-5.3 Codex: —, Phi 3 Mini 4k Instruct: 26.5 (#275)
| Benchmark | GPT-5.3 Codex | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Non-English | — | 1021 |
| LMArena Chinese | — | 1021 |
| LMArena French | — | 1075 |
| LMArena German | — | 1044 |
| LMArena Japanese | — | 935 |
| LMArena Korean | — | 905 |
| LMArena Russian | — | 1022 |
| LMArena Spanish | — | 1084 |
Instruction Following Not comparable
GPT-5.3 Codex: —, Phi 3 Mini 4k Instruct: 48.0 (#298)
| Benchmark | GPT-5.3 Codex | Phi 3 Mini 4k Instruct |
|---|---|---|
| LiveBench Instruction Following | — | 39.1% |
| LMArena Instruction Following | — | 1053 |
Long Context Not comparable
GPT-5.3 Codex: —, Phi 3 Mini 4k Instruct: 31.7 (#271)
| Benchmark | GPT-5.3 Codex | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Longer Query | — | 1044 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, Phi 3 Mini 4k Instruct: 27.7 (#295)
| Benchmark | GPT-5.3 Codex | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Text | — | 1073 |
| LMArena Creative Writing | — | 1037 |
| LMArena Multi-Turn | — | 1018 |
| LiveBench Language | — | 9.2% |
Frequently asked questions
Is GPT-5.3 Codex better than Phi 3 Mini 4k Instruct?
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 27.4 on the Noometry Index.
Is GPT-5.3 Codex or Phi 3 Mini 4k Instruct better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 26.1 in the Noometry coding category.
How many benchmarks do GPT-5.3 Codex and Phi 3 Mini 4k Instruct share?
0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Phi 3 Mini 4k Instruct has 35.