Model comparison
GPT-5.3 Codex vs Llama 2-13B
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 29.6 on the Noometry Index.
Last verified . 1 shared benchmarks.
MetaSummary
- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 1 category and Llama 2-13B 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 30.9.
- Llama 2-13B has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Codex | Llama 2-13B | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 45.8 | 29.6 |
| Released | 2026-02-05 | 2023-07-18 |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 8 | 32 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.6 (#56), Llama 2-13B: 30.9 (#291)
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1409 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1062 |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#9), Llama 2-13B: —
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Llama 2-13B: 12.8 (#337)
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| Epoch Capabilities Index | 156.77 | 106.17 |
| Chess Puzzles | — | 0% |
| LMArena Hard Prompts | — | 1051 |
| DTBench | — | 42.2% |
| BIG-Bench Hard | — | 58.2% |
| HellaSwag | — | 80.7% |
| LAMBADA | — | 76.5% |
| PIQA | — | 80.8% |
| WinoGrande | — | 72.8% |
Math Not comparable
GPT-5.3 Codex: —, Llama 2-13B: 31.1 (#229)
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| LMArena Math | — | 1065 |
| GSM8K | — | 36.9% |
Knowledge Not comparable
GPT-5.3 Codex: —, Llama 2-13B: 28.1 (#249)
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| LMArena Expert | — | 1030 |
| ARC (AI2) Challenge | — | 60.3% |
| BoolQ | — | 82.4% |
| MMLU | — | 55.6% |
| OpenBookQA | — | 57% |
| TriviaQA | — | 79.6% |
Multimodal Not comparable
GPT-5.3 Codex: —, Llama 2-13B: —
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| ScienceQA | — | 55.8% |
Multilingual Not comparable
GPT-5.3 Codex: —, Llama 2-13B: 26.5 (#279)
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| LMArena Non-English | — | 1024 |
| LMArena Chinese | — | 1001 |
| LMArena French | — | 1044 |
| LMArena German | — | 1009 |
| LMArena Japanese | — | 894 |
| LMArena Korean | — | 953 |
| LMArena Russian | — | 1055 |
| LMArena Spanish | — | 1087 |
Instruction Following Not comparable
GPT-5.3 Codex: —, Llama 2-13B: 53.3 (#287)
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| LMArena Instruction Following | — | 1045 |
Long Context Not comparable
GPT-5.3 Codex: —, Llama 2-13B: 32.3 (#269)
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| LMArena Longer Query | — | 1064 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, Llama 2-13B: 29.8 (#289)
| Benchmark | GPT-5.3 Codex | Llama 2-13B |
|---|---|---|
| LMArena Text | — | 1084 |
| LMArena Creative Writing | — | 1047 |
| LMArena Multi-Turn | — | 1050 |
Frequently asked questions
Is GPT-5.3 Codex better than Llama 2-13B?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 29.6 on the Noometry Index.
Is GPT-5.3 Codex or Llama 2-13B better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 30.9 in the Noometry coding category.
How many benchmarks do GPT-5.3 Codex and Llama 2-13B share?
1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Llama 2-13B has 32.