Model comparison
GLM-5.1 vs Grok 4.20 Multi-Agent
GLM-5.1 is the stronger model overall, scoring 47.8 to 46.2 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. GLM-5.1 scores higher in 7 categories and Grok 4.20 Multi-Agent in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GLM-5.1 leads 54.9 to 40.4.
- The biggest single-benchmark swing is NYT Connections (extended): 77.7% for GLM-5.1 and 89.6% for Grok 4.20 Multi-Agent.
- Grok 4.20 Multi-Agent is cheaper at $1.25 / $2.50 per million input/output tokens, against $1.40 / $4.40 for GLM-5.1.
- Grok 4.20 Multi-Agent accepts more context: 1M tokens versus 200K.
- GLM-5.1 has downloadable open weights; the other is API-only.
Side by side
| GLM-5.1 | Grok 4.20 Multi-Agent | |
|---|---|---|
| Provider | Z.ai (Zhipu) | xAI |
| Noometry Index | 47.8 | 46.2 |
| Released | 2026-04-07 | 2026-03-09 |
| Weights | Open | Proprietary |
| Context window | 200K | 1M |
| Max output | 131K | 30K |
| Input $ / M tokens | $1.40 | $1.25 |
| Output $ / M tokens | $4.40 | $2.50 |
| Results tracked | 41 | 20 |
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Category by category
Coding GLM-5.1 leads
GLM-5.1: 48.7 (#55), Grok 4.20 Multi-Agent: 43.0 (#92)
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Coding | 1485 | 1457 |
| SWE-bench Verified | 74.2% | — |
| LMArena WebDev | 1508 | — |
| SciCode | 43.8% | — |
| WeirdML | 57.1% | — |
| ALE-Bench | 887.1 | — |
Agentic & Tool Use Not comparable
GLM-5.1: 24.9 (#113), Grok 4.20 Multi-Agent: —
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| APEX-Agents | 40.9% | — |
| ExploitBench | 18.1% | — |
| GBAEval | 0% | — |
| LMArena Search | — | 1204 |
| Vending-Bench 2 | 5,634 | — |
Reasoning Grok 4.20 Multi-Agent leads
GLM-5.1: 39.1 (#60), Grok 4.20 Multi-Agent: 43.9 (#48)
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| NYT Connections (extended) | 77.7% | 89.6% |
| LMArena Hard Prompts | 1472 | 1448 |
| SimpleBench | 55.1% | — |
| CritPt | 4.6% | — |
| Chess Puzzles | 19% | — |
| Thematic Generalization | 69.8% | — |
| Epoch Capabilities Index | 149.84 | — |
Math GLM-5.1 leads
GLM-5.1: 49.7 (#60), Grok 4.20 Multi-Agent: 39.4 (#104)
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Math | 1473 | 1442 |
| FrontierMath (Tiers 1-3) | 36.8% | — |
| MathArena Final-Answer Competitions | 67.1% | — |
| OTIS Mock AIME 2024-2025 | 93.3% | — |
| ProofBench | 22.2% | — |
| FrontierMath (Feb 2025 set) | 33.4% | — |
| FrontierMath Tier 4 (v1) | 12.5% | — |
Knowledge GLM-5.1 leads
GLM-5.1: 54.9 (#50), Grok 4.20 Multi-Agent: 40.4 (#119)
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Expert | 1476 | 1445 |
| GPQA Diamond | 89.9% | — |
| SimpleQA Verified | 34% | — |
Multimodal Not comparable
GLM-5.1: —, Grok 4.20 Multi-Agent: 40.5 (#48)
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Vision | — | 1259 |
Multilingual Too close to call
GLM-5.1: 55.0 (#36), Grok 4.20 Multi-Agent: 54.4 (#43)
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Non-English | 1447 | 1440 |
| LMArena Chinese | 1515 | 1475 |
| LMArena French | 1474 | 1466 |
| LMArena German | 1465 | 1456 |
| LMArena Japanese | 1434 | 1405 |
| LMArena Korean | 1418 | 1416 |
| LMArena Russian | 1454 | 1457 |
| LMArena Spanish | 1469 | 1447 |
Instruction Following GLM-5.1 leads
GLM-5.1: 76.3 (#42), Grok 4.20 Multi-Agent: 74.8 (#84)
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Instruction Following | 1451 | 1420 |
Long Context GLM-5.1 leads
GLM-5.1: 44.9 (#53), Grok 4.20 Multi-Agent: 43.7 (#88)
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Longer Query | 1466 | 1431 |
Writing & Preference GLM-5.1 leads
GLM-5.1: 66.9 (#31), Grok 4.20 Multi-Agent: 64.0 (#59)
| Benchmark | GLM-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Text | 1461 | 1450 |
| LMArena Creative Writing | 1453 | 1436 |
| LMArena Multi-Turn | 1472 | 1452 |
| EQ-Bench Creative Writing | 1592 | — |
Frequently asked questions
Is GLM-5.1 better than Grok 4.20 Multi-Agent?
GLM-5.1 is the stronger model overall, scoring 47.8 to 46.2 on the Noometry Index.
Which is cheaper, GLM-5.1 or Grok 4.20 Multi-Agent?
Grok 4.20 Multi-Agent is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; GLM-5.1 lists at $1.40 and $4.40.
Is GLM-5.1 or Grok 4.20 Multi-Agent better for coding?
GLM-5.1 scores higher on coding benchmarks: 48.7 versus 43.0 in the Noometry coding category.
Which has the bigger context window?
Grok 4.20 Multi-Agent does, with 1M tokens against 200K.
How many benchmarks do GLM-5.1 and Grok 4.20 Multi-Agent share?
18 benchmarks have published results for both models. GLM-5.1 has 41 scored results on Noometry and Grok 4.20 Multi-Agent has 20.