Model comparison
Gemma 2 9B vs GPT-5.3 Codex
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 25.7 on the Noometry Index.
Last verified . 1 shared benchmarks.
GoogleSummary
- They share 1 benchmark with published results for both. Gemma 2 9B scores higher in 0 categories and GPT-5.3 Codex in 1 category; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 29.0.
- Gemma 2 9B has downloadable open weights; the other is API-only.
Side by side
| Gemma 2 9B | GPT-5.3 Codex | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 25.7 | 45.5 |
| Released | 2024-06-24 | 2026-02-05 |
| Weights | Open | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $1.75 |
| Output $ / M tokens | — | $14 |
| Results tracked | 35 | 8 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding GPT-5.3 Codex leads
Gemma 2 9B: 29.0 (#299), GPT-5.3 Codex: 48.5 (#51)
| Benchmark | Gemma 2 9B | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | — | 74.8% |
| LMArena WebDev | — | 1408 |
| WeirdML | — | 79.3% |
| BigCodeBench Instruct | 34.7% | — |
| LiveBench Coding | 22.5% | — |
| LMArena Coding | 1174 | — |
| BigCodeBench Complete | 40.6% | — |
| ALE-Bench | — | 1,655 |
Agentic & Tool Use Not comparable
Gemma 2 9B: —, GPT-5.3 Codex: 47.8 (#9)
| Benchmark | Gemma 2 9B | GPT-5.3 Codex |
|---|---|---|
| Terminal-Bench | — | 78.4% |
| METR Time Horizons | — | 74.5% |
| Vending-Bench 2 | — | 5,940 |
Reasoning Not comparable
Gemma 2 9B: 15.3 (#306), GPT-5.3 Codex: —
| Benchmark | Gemma 2 9B | GPT-5.3 Codex |
|---|---|---|
| Epoch Capabilities Index | 119.78 | 156.84 |
| LiveBench Reasoning | 15.2% | — |
| LMArena Hard Prompts | 1172 | — |
| LiveBench Data Analysis | 36.4% | — |
| LiveBench | 28.7% | — |
| PIQA | 83.7% | — |
Math Not comparable
Gemma 2 9B: 9.3 (#312), GPT-5.3 Codex: —
| Benchmark | Gemma 2 9B | GPT-5.3 Codex |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 0.6% | — |
| LiveBench Math | 19.8% | — |
| LMArena Math | 1183 | — |
| MATH Level 5 | 21% | — |
| GSM8K | 84.9% | — |
Knowledge Not comparable
Gemma 2 9B: 9.7 (#300), GPT-5.3 Codex: —
| Benchmark | Gemma 2 9B | GPT-5.3 Codex |
|---|---|---|
| GPQA Diamond | 27.5% | — |
| LMArena Expert | 1147 | — |
| BoolQ | 85.7% | — |
| MMLU | 72.1% | — |
Multilingual Not comparable
Gemma 2 9B: 36.8 (#233), GPT-5.3 Codex: —
| Benchmark | Gemma 2 9B | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 1188 | — |
| LMArena Chinese | 1185 | — |
| LMArena French | 1189 | — |
| LMArena German | 1186 | — |
| LMArena Japanese | 1144 | — |
| LMArena Korean | 1137 | — |
| LMArena Russian | 1200 | — |
| LMArena Spanish | 1200 | — |
Instruction Following Not comparable
Gemma 2 9B: 57.8 (#264), GPT-5.3 Codex: —
| Benchmark | Gemma 2 9B | GPT-5.3 Codex |
|---|---|---|
| LiveBench Instruction Following | 52.6% | — |
| LMArena Instruction Following | 1178 | — |
Long Context Not comparable
Gemma 2 9B: 36.3 (#228), GPT-5.3 Codex: —
| Benchmark | Gemma 2 9B | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 1197 | — |
Writing & Preference Not comparable
Gemma 2 9B: 32.3 (#276), GPT-5.3 Codex: —
| Benchmark | Gemma 2 9B | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1207 | — |
| LMArena Creative Writing | 1206 | — |
| EQ-Bench Creative Writing | 841 | — |
| LMArena Multi-Turn | 1193 | — |
| LiveBench Language | 25.5% | — |
Frequently asked questions
Is Gemma 2 9B better than GPT-5.3 Codex?
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 25.7 on the Noometry Index.
Is Gemma 2 9B or GPT-5.3 Codex better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 29.0 in the Noometry coding category.
How many benchmarks do Gemma 2 9B and GPT-5.3 Codex share?
1 benchmark has published results for both models. Gemma 2 9B has 35 scored results on Noometry and GPT-5.3 Codex has 8.