Model comparison
GLM-4.5V vs Grok 4 Fast
GLM-4.5V and Grok 4 Fast score almost the same on the Noometry Index (39.2 vs 39.0), so choose on price, context window or the category you care about most.
Last verified . 14 shared benchmarks.
Summary
- They share 14 benchmarks with published results for both. GLM-4.5V scores higher in 3 categories and Grok 4 Fast in 5 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 39.6.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 59.8% for GLM-4.5V and 66.1% for Grok 4 Fast.
- GLM-4.5V has downloadable open weights; the other is API-only.
Side by side
| GLM-4.5V | Grok 4 Fast | |
|---|---|---|
| Provider | Z.ai (Zhipu) | xAI |
| Noometry Index | 39.2 | 39.0 |
| Released | 2025-08-11 | 2025-09-19 |
| Weights | Open | Proprietary |
| Context window | 64K | — |
| Max output | 16K | — |
| Input $ / M tokens | $0.60 | — |
| Output $ / M tokens | $1.80 | — |
| Results tracked | 15 | 30 |
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Category by category
Coding GLM-4.5V leads
GLM-4.5V: 38.9 (#152), Grok 4 Fast: 32.3 (#264)
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1347 | 1429 |
| LMArena WebDev | — | 1160 |
| WeirdML | — | 42.9% |
Agentic & Tool Use Not comparable
GLM-4.5V: —, Grok 4 Fast: 29.3 (#80)
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning GLM-4.5V leads
GLM-4.5V: 26.5 (#118), Grok 4 Fast: 22.5 (#179)
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| Kagi LLM Benchmark | 59.8% | 66.1% |
| LMArena Hard Prompts | 1335 | 1413 |
| ARC-AGI-2 | — | 5.3% |
| ARC-AGI-1 | — | 48.5% |
| DTBench | — | 82.7% |
| Epoch Capabilities Index | — | 144.21 |
| ForecastBench | — | 60.5 |
Math Grok 4 Fast leads
GLM-4.5V: 34.7 (#157), Grok 4 Fast: 36.1 (#126)
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1353 | 1419 |
Knowledge GLM-4.5V leads
GLM-4.5V: 36.8 (#155), Grok 4 Fast: 31.5 (#211)
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1353 | 1411 |
| Vectara Hallucination Rate | — | 19.7% |
Multimodal Not comparable
GLM-4.5V: 33.6 (#86), Grok 4 Fast: —
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1154 | — |
Multilingual Grok 4 Fast leads
GLM-4.5V: 44.9 (#172), Grok 4 Fast: 51.5 (#106)
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1304 | 1397 |
| LMArena Chinese | 1338 | 1458 |
| LMArena Russian | 1299 | 1387 |
| LMArena Spanish | 1335 | 1414 |
| LMArena French | — | 1433 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1358 |
| LMArena Korean | — | 1359 |
Instruction Following Grok 4 Fast leads
GLM-4.5V: 69.4 (#170), Grok 4 Fast: 73.4 (#116)
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1311 | 1388 |
Long Context Grok 4 Fast leads
GLM-4.5V: 39.6 (#166), Grok 4 Fast: 63.2 (#3)
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1305 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Grok 4 Fast leads
GLM-4.5V: 52.7 (#162), Grok 4 Fast: 60.2 (#96)
| Benchmark | GLM-4.5V | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1333 | 1407 |
| LMArena Creative Writing | 1295 | 1388 |
| LMArena Multi-Turn | 1333 | 1414 |
Frequently asked questions
Is GLM-4.5V better than Grok 4 Fast?
GLM-4.5V and Grok 4 Fast score almost the same on the Noometry Index (39.2 vs 39.0), so choose on price, context window or the category you care about most.
Is GLM-4.5V or Grok 4 Fast better for coding?
GLM-4.5V scores higher on coding benchmarks: 38.9 versus 32.3 in the Noometry coding category.
How many benchmarks do GLM-4.5V and Grok 4 Fast share?
14 benchmarks have published results for both models. GLM-4.5V has 15 scored results on Noometry and Grok 4 Fast has 30.