Model comparison
Deepseek Coder v2 vs GPT-5.1-Codex
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 35.9 on the Noometry Index.
Last verified . 0 shared benchmarks.
DeepSeekSummary
- The widest gap is in math, where Deepseek Coder v2 leads 34.9 to 30.3.
- Deepseek Coder v2 has downloadable open weights; the other is API-only.
Side by side
| Deepseek Coder v2 | GPT-5.1-Codex | |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Noometry Index | 35.9 | 38.6 |
| Released | 2024-06-17 | 2025-11-12 |
| Weights | Open | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $1.25 |
| Output $ / M tokens | — | $10 |
| Results tracked | 24 | 6 |
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Category by category
Coding GPT-5.1-Codex leads
Deepseek Coder v2: 38.1 (#183), GPT-5.1-Codex: 41.9 (#116)
| Benchmark | Deepseek Coder v2 | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| BigCodeBench Instruct | 48.2% | — |
| LMArena Coding | 1251 | — |
| BigCodeBench Complete | 59.7% | — |
| ALE-Bench | — | 1,245 |
| HumanEval+ | 82.3% | — |
| MBPP+ | 75.1% | — |
Agentic & Tool Use Not comparable
Deepseek Coder v2: —, GPT-5.1-Codex: 38.0 (#33)
| Benchmark | Deepseek Coder v2 | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| METR Time Horizons | — | 70.8% |
Reasoning Not comparable
Deepseek Coder v2: 23.6 (#176), GPT-5.1-Codex: —
| Benchmark | Deepseek Coder v2 | GPT-5.1-Codex |
|---|---|---|
| LMArena Hard Prompts | 1207 | — |
| WinoGrande | 83.7% | — |
Math Deepseek Coder v2 leads
Deepseek Coder v2: 34.9 (#190), GPT-5.1-Codex: 30.3 (#235)
| Benchmark | Deepseek Coder v2 | GPT-5.1-Codex |
|---|---|---|
| ProofBench | — | 9% |
| LMArena Math | 1241 | — |
| GSM8K | 94.5% | — |
Knowledge Not comparable
Deepseek Coder v2: 32.3 (#212), GPT-5.1-Codex: —
| Benchmark | Deepseek Coder v2 | GPT-5.1-Codex |
|---|---|---|
| LMArena Expert | 1181 | — |
| ARC (AI2) Challenge | 64.3% | — |
Multilingual Not comparable
Deepseek Coder v2: 36.3 (#240), GPT-5.1-Codex: —
| Benchmark | Deepseek Coder v2 | GPT-5.1-Codex |
|---|---|---|
| LMArena Non-English | 1182 | — |
| LMArena Chinese | 1201 | — |
| LMArena French | 1185 | — |
| LMArena German | 1164 | — |
| LMArena Japanese | 1126 | — |
| LMArena Korean | 1104 | — |
| LMArena Russian | 1188 | — |
| LMArena Spanish | 1153 | — |
Instruction Following Not comparable
Deepseek Coder v2: 61.7 (#242), GPT-5.1-Codex: —
| Benchmark | Deepseek Coder v2 | GPT-5.1-Codex |
|---|---|---|
| LMArena Instruction Following | 1180 | — |
Long Context Not comparable
Deepseek Coder v2: 37.0 (#224), GPT-5.1-Codex: —
| Benchmark | Deepseek Coder v2 | GPT-5.1-Codex |
|---|---|---|
| LMArena Longer Query | 1219 | — |
Writing & Preference Not comparable
Deepseek Coder v2: 38.2 (#253), GPT-5.1-Codex: —
| Benchmark | Deepseek Coder v2 | GPT-5.1-Codex |
|---|---|---|
| LMArena Text | 1191 | — |
| LMArena Creative Writing | 1120 | — |
| LMArena Multi-Turn | 1177 | — |
Frequently asked questions
Is Deepseek Coder v2 better than GPT-5.1-Codex?
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 35.9 on the Noometry Index.
Is Deepseek Coder v2 or GPT-5.1-Codex better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 38.1 in the Noometry coding category.
How many benchmarks do Deepseek Coder v2 and GPT-5.1-Codex share?
0 benchmarks have published results for both models. Deepseek Coder v2 has 24 scored results on Noometry and GPT-5.1-Codex has 6.