Model comparison
GLM-5.3-Flash vs Grok 4 Heavy
GLM-5.3-Flash has enough public results to be ranked (#45); Grok 4 Heavy does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- GLM-5.3-Flash has downloadable open weights; the other is API-only.
Side by side
| GLM-5.3-Flash | Grok 4 Heavy | |
|---|---|---|
| Provider | Z.ai (Zhipu) | xAI |
| Noometry Index | 49.6 | — |
| Released | 2026-08-20 | 2025-07-10 |
| Weights | Open | Proprietary |
| Context window | 1M | — |
| Max output | 131K | — |
| Input $ / M tokens | $0.15 | — |
| Output $ / M tokens | $0.50 | — |
| Results tracked | 36 | 1 |
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Category by category
Coding Not comparable
GLM-5.3-Flash: 53.7 (#26), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| DeepSWE | 63.4% | — |
| FrontierCode | 31.8% | — |
| LMArena WebDev | 1614 | — |
| SciCode | 51.6% | — |
| LMArena Coding | 1506 | — |
| ALE-Bench | 303.55 | — |
Agentic & Tool Use Not comparable
GLM-5.3-Flash: 34.3 (#41), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| APEX-Agents | 52.8% | — |
| GDP.pdf | 14% | — |
Reasoning Not comparable
GLM-5.3-Flash: 31.7 (#69), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| CritPt | 15.4% | — |
| Chess Puzzles | 14% | — |
| LMArena Hard Prompts | 1490 | — |
| Mystery Game Puzzles | 8% | — |
| Surface Evolver Bench | 52.5% | — |
| Bench to the Future 3 | 0.15 | — |
| Epoch Capabilities Index | 151.9 | — |
Math Not comparable
GLM-5.3-Flash: 53.1 (#38), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.8% | — |
| FrontierMath Tier 4 | 17.1% | — |
| OTIS Mock AIME 2024-2025 | 93.9% | — |
| ProofBench | 21% | — |
| LMArena Math | 1499 | — |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Not comparable
GLM-5.3-Flash: 58.4 (#33), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| GPQA Diamond | 90.2% | — |
| LMArena Expert | 1512 | — |
Multimodal Not comparable
GLM-5.3-Flash: 42.6 (#25), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| LMArena Vision | 1304 | — |
Multilingual Not comparable
GLM-5.3-Flash: 56.2 (#24), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| LMArena Non-English | 1462 | — |
| LMArena Chinese | 1529 | — |
| LMArena French | 1495 | — |
| LMArena German | 1457 | — |
| LMArena Japanese | 1420 | — |
| LMArena Korean | 1443 | — |
| LMArena Russian | 1472 | — |
| LMArena Spanish | 1471 | — |
Instruction Following Not comparable
GLM-5.3-Flash: 77.8 (#17), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| LMArena Instruction Following | 1480 | — |
Long Context Not comparable
GLM-5.3-Flash: 45.3 (#41), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| LMArena Longer Query | 1479 | — |
Writing & Preference Not comparable
GLM-5.3-Flash: 65.4 (#49), Grok 4 Heavy: —
| Benchmark | GLM-5.3-Flash | Grok 4 Heavy |
|---|---|---|
| LMArena Text | 1471 | — |
| LMArena Creative Writing | 1440 | — |
| LMArena Multi-Turn | 1471 | — |
Frequently asked questions
Is GLM-5.3-Flash better than Grok 4 Heavy?
GLM-5.3-Flash has enough public results to be ranked (#45); Grok 4 Heavy does not yet, so treat this comparison as directional.
How many benchmarks do GLM-5.3-Flash and Grok 4 Heavy share?
0 benchmarks have published results for both models. GLM-5.3-Flash has 36 scored results on Noometry and Grok 4 Heavy has 1.