Model comparison
GLM-5.3 vs Grok 4 Fast
GLM-5.3 is the stronger model overall, scoring 54.8 to 39.4 on the Noometry Index.
Last verified . 21 shared benchmarks.
Summary
- They share 21 benchmarks with published results for both. GLM-5.3 scores higher in 8 categories and Grok 4 Fast in 1 category; 9 gaps are clear of the uncertainty.
- The widest gap is in coding, where GLM-5.3 leads 59.5 to 32.5.
- The biggest single-benchmark swing is WeirdML: 75.4% for GLM-5.3 and 42.9% for Grok 4 Fast.
- GLM-5.3 has downloadable open weights; the other is API-only.
Side by side
| GLM-5.3 | Grok 4 Fast | |
|---|---|---|
| Provider | Z.ai (Zhipu) | xAI |
| Noometry Index | 54.8 | 39.4 |
| Released | 2026-08-14 | 2025-09-19 |
| Weights | Open | Proprietary |
| Context window | 1M | — |
| Max output | 131K | — |
| Input $ / M tokens | $1.40 | — |
| Output $ / M tokens | $4.40 | — |
| Results tracked | 42 | 30 |
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Category by category
Coding GLM-5.3 leads
GLM-5.3: 59.5 (#14), Grok 4 Fast: 32.5 (#271)
| Benchmark | GLM-5.3 | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | 1622 | 1159 |
| WeirdML | 75.4% | 42.9% |
| LMArena Coding | 1496 | 1429 |
| DeepSWE | 69% | — |
| FrontierCode | 40.1% | — |
| CursorBench | 42.6% | — |
| FrontierSWE | 30.2% | — |
| SciCode | 59% | — |
| ALE-Bench | 1,317 | — |
Agentic & Tool Use GLM-5.3 leads
GLM-5.3: 36.4 (#38), Grok 4 Fast: 29.5 (#86)
| Benchmark | GLM-5.3 | Grok 4 Fast |
|---|---|---|
| APEX-Agents | 56.6% | — |
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | 8,164 | — |
Reasoning GLM-5.3 leads
GLM-5.3: 46.1 (#46), Grok 4 Fast: 22.2 (#201)
| Benchmark | GLM-5.3 | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1489 | 1412 |
| DTBench | 87.7% | 82.7% |
| Epoch Capabilities Index | 155.61 | 144.2 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| NYT Connections (extended) | 74.2% | — |
| ARC-AGI-1 | — | 48.5% |
| CritPt | 19.1% | — |
| Chess Puzzles | 21% | — |
| Mystery Game Puzzles | 33% | — |
| LMCA | 55.5% | — |
| Bench to the Future 3 | 0.15 | — |
| ForecastBench | — | 60.5 |
Math GLM-5.3 leads
GLM-5.3: 62.3 (#33), Grok 4 Fast: 38.9 (#123)
| Benchmark | GLM-5.3 | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1489 | 1419 |
| FrontierMath (Tiers 1-3) | 68.8% | — |
| FrontierMath Tier 4 | 29.3% | — |
| OTIS Mock AIME 2024-2025 | 91.1% | — |
| ProofBench | 49% | — |
Knowledge GLM-5.3 leads
GLM-5.3: 58.3 (#37), Grok 4 Fast: 32.0 (#214)
| Benchmark | GLM-5.3 | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1516 | 1411 |
| GPQA Diamond | 90.9% | — |
| SimpleQA Verified | 41% | — |
| Vectara Hallucination Rate | — | 19.7% |
Multilingual GLM-5.3 leads
GLM-5.3: 55.7 (#28), Grok 4 Fast: 51.3 (#111)
| Benchmark | GLM-5.3 | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1457 | 1396 |
| LMArena Chinese | 1528 | 1457 |
| LMArena French | 1499 | 1431 |
| LMArena German | 1499 | 1383 |
| LMArena Japanese | 1453 | 1352 |
| LMArena Korean | 1472 | 1357 |
| LMArena Russian | 1463 | 1389 |
| LMArena Spanish | 1460 | 1415 |
Instruction Following GLM-5.3 leads
GLM-5.3: 77.5 (#23), Grok 4 Fast: 73.2 (#121)
| Benchmark | GLM-5.3 | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1477 | 1387 |
Long Context Grok 4 Fast leads
GLM-5.3: 45.4 (#41), Grok 4 Fast: 63.2 (#3)
| Benchmark | GLM-5.3 | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1482 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference GLM-5.3 leads
GLM-5.3: 75.7 (#6), Grok 4 Fast: 60.0 (#102)
| Benchmark | GLM-5.3 | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1471 | 1407 |
| LMArena Creative Writing | 1457 | 1387 |
| LMArena Multi-Turn | 1472 | 1414 |
| EQ-Bench Creative Writing | 2075 | — |
Frequently asked questions
Is GLM-5.3 better than Grok 4 Fast?
GLM-5.3 is the stronger model overall, scoring 54.8 to 39.4 on the Noometry Index.
Is GLM-5.3 or Grok 4 Fast better for coding?
GLM-5.3 scores higher on coding benchmarks: 59.5 versus 32.5 in the Noometry coding category.
How many benchmarks do GLM-5.3 and Grok 4 Fast share?
21 benchmarks have published results for both models. GLM-5.3 has 42 scored results on Noometry and Grok 4 Fast has 30.