Model comparison
Grok 4 Fast vs Yi-34B
Grok 4 Fast is the stronger model overall, scoring 39.4 to 27.8 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Grok 4 Fast scores higher in 8 categories and Yi-34B in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 33.2.
- Yi-34B has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | Yi-34B | |
|---|---|---|
| Provider | xAI | 01.AI |
| Noometry Index | 39.4 | 27.8 |
| Released | 2025-09-19 | 2023-11-02 |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 23 |
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Category by category
Coding Too close to call
Grok 4 Fast: 32.5 (#271), Yi-34B: 32.3 (#274)
| Benchmark | Grok 4 Fast | Yi-34B |
|---|---|---|
| LMArena Coding | 1429 | 1112 |
| LMArena WebDev | 1159 | — |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.5 (#86), Yi-34B: —
| Benchmark | Grok 4 Fast | Yi-34B |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Grok 4 Fast leads
Grok 4 Fast: 22.2 (#201), Yi-34B: 21.2 (#226)
| Benchmark | Grok 4 Fast | Yi-34B |
|---|---|---|
| LMArena Hard Prompts | 1412 | 1104 |
| Epoch Capabilities Index | 144.2 | 117.39 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| BIG-Bench Hard | — | 71.7% |
| ForecastBench | 60.5 | — |
Math Grok 4 Fast leads
Grok 4 Fast: 38.9 (#123), Yi-34B: 21.6 (#282)
| Benchmark | Grok 4 Fast | Yi-34B |
|---|---|---|
| LMArena Math | 1419 | 1114 |
| MATH Level 5 | — | 5.1% |
| GSM8K | — | 76% |
Knowledge Grok 4 Fast leads
Grok 4 Fast: 32.0 (#214), Yi-34B: 7.5 (#309)
| Benchmark | Grok 4 Fast | Yi-34B |
|---|---|---|
| LMArena Expert | 1411 | 1061 |
| GPQA Diamond | — | 14.7% |
| Vectara Hallucination Rate | 19.7% | — |
| MMLU | — | 76.3% |
Multilingual Grok 4 Fast leads
Grok 4 Fast: 51.3 (#111), Yi-34B: 29.7 (#264)
| Benchmark | Grok 4 Fast | Yi-34B |
|---|---|---|
| LMArena Non-English | 1396 | 1079 |
| LMArena Chinese | 1457 | 1176 |
| LMArena French | 1431 | 1081 |
| LMArena German | 1383 | 1042 |
| LMArena Japanese | 1352 | 993 |
| LMArena Korean | 1357 | 959 |
| LMArena Russian | 1389 | 1050 |
| LMArena Spanish | 1415 | 1070 |
Instruction Following Grok 4 Fast leads
Grok 4 Fast: 73.2 (#121), Yi-34B: 56.2 (#274)
| Benchmark | Grok 4 Fast | Yi-34B |
|---|---|---|
| LMArena Instruction Following | 1387 | 1091 |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Yi-34B: 33.2 (#264)
| Benchmark | Grok 4 Fast | Yi-34B |
|---|---|---|
| LMArena Longer Query | 1415 | 1094 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Grok 4 Fast leads
Grok 4 Fast: 60.0 (#102), Yi-34B: 34.1 (#273)
| Benchmark | Grok 4 Fast | Yi-34B |
|---|---|---|
| LMArena Text | 1407 | 1129 |
| LMArena Creative Writing | 1387 | 1108 |
| LMArena Multi-Turn | 1414 | 1113 |
Frequently asked questions
Is Grok 4 Fast better than Yi-34B?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 27.8 on the Noometry Index.
Is Grok 4 Fast or Yi-34B better for coding?
They score almost the same on coding (32.5 vs 32.3); test both on your own repository before choosing.
How many benchmarks do Grok 4 Fast and Yi-34B share?
18 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Yi-34B has 23.