Model comparison
GPT-5.1-Codex vs Yi-34B
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 27.8 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in coding, where GPT-5.1-Codex leads 41.9 to 32.3.
- Yi-34B has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Yi-34B | |
|---|---|---|
| Provider | OpenAI | 01.AI |
| Noometry Index | 38.6 | 27.8 |
| Released | 2025-11-12 | 2023-11-02 |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 6 | 23 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Yi-34B: 32.3 (#274)
| Benchmark | GPT-5.1-Codex | Yi-34B |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 1112 |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 38.0 (#33), Yi-34B: —
| Benchmark | GPT-5.1-Codex | Yi-34B |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Yi-34B: 21.2 (#226)
| Benchmark | GPT-5.1-Codex | Yi-34B |
|---|---|---|
| LMArena Hard Prompts | — | 1104 |
| BIG-Bench Hard | — | 71.7% |
| Epoch Capabilities Index | — | 117.39 |
Math GPT-5.1-Codex leads
GPT-5.1-Codex: 30.3 (#235), Yi-34B: 21.6 (#282)
| Benchmark | GPT-5.1-Codex | Yi-34B |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1114 |
| MATH Level 5 | — | 5.1% |
| GSM8K | — | 76% |
Knowledge Not comparable
GPT-5.1-Codex: —, Yi-34B: 7.5 (#309)
| Benchmark | GPT-5.1-Codex | Yi-34B |
|---|---|---|
| GPQA Diamond | — | 14.7% |
| LMArena Expert | — | 1061 |
| MMLU | — | 76.3% |
Multilingual Not comparable
GPT-5.1-Codex: —, Yi-34B: 29.7 (#264)
| Benchmark | GPT-5.1-Codex | Yi-34B |
|---|---|---|
| LMArena Non-English | — | 1079 |
| LMArena Chinese | — | 1176 |
| LMArena French | — | 1081 |
| LMArena German | — | 1042 |
| LMArena Japanese | — | 993 |
| LMArena Korean | — | 959 |
| LMArena Russian | — | 1050 |
| LMArena Spanish | — | 1070 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Yi-34B: 56.2 (#274)
| Benchmark | GPT-5.1-Codex | Yi-34B |
|---|---|---|
| LMArena Instruction Following | — | 1091 |
Long Context Not comparable
GPT-5.1-Codex: —, Yi-34B: 33.2 (#264)
| Benchmark | GPT-5.1-Codex | Yi-34B |
|---|---|---|
| LMArena Longer Query | — | 1094 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Yi-34B: 34.1 (#273)
| Benchmark | GPT-5.1-Codex | Yi-34B |
|---|---|---|
| LMArena Text | — | 1129 |
| LMArena Creative Writing | — | 1108 |
| LMArena Multi-Turn | — | 1113 |
Frequently asked questions
Is GPT-5.1-Codex better than Yi-34B?
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 27.8 on the Noometry Index.
Is GPT-5.1-Codex or Yi-34B better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 32.3 in the Noometry coding category.
How many benchmarks do GPT-5.1-Codex and Yi-34B share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Yi-34B has 23.