Model comparison
GLM-4.5 vs Grok 4.20 (Non-Reasoning)
Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.6 to 42.0 on the Noometry Index. GLM-4.5 costs 1.6× less per token, which makes it the better buy when Grok 4.20 (Non-Reasoning)'s lead doesn't matter for your workload.
Last verified . 21 shared benchmarks.
Summary
- They share 21 benchmarks with published results for both. GLM-4.5 scores higher in 0 categories and Grok 4.20 (Non-Reasoning) in 8 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 (Non-Reasoning) leads 52.3 to 28.6.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 57.9% for GLM-4.5 and 75% for Grok 4.20 (Non-Reasoning).
- GLM-4.5 is cheaper at $0.60 / $2.20 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 (Non-Reasoning).
- Grok 4.20 (Non-Reasoning) accepts more context: 1M tokens versus 131K.
- GLM-4.5 has downloadable open weights; the other is API-only.
Side by side
| GLM-4.5 | Grok 4.20 (Non-Reasoning) | |
|---|---|---|
| Provider | Z.ai (Zhipu) | xAI |
| Noometry Index | 42.0 | 48.6 |
| Released | 2025-07-27 | 2026-02-17 |
| Weights | Open | Proprietary |
| Context window | 131K | 1M |
| Max output | 98K | 30K |
| Input $ / M tokens | $0.60 | $1.25 |
| Output $ / M tokens | $2.20 | $2.50 |
| Results tracked | 27 | 46 |
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Category by category
Coding Too close to call
GLM-4.5: 41.4 (#125), Grok 4.20 (Non-Reasoning): 42.1 (#112)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| WeirdML | 40.6% | 52.3% |
| LMArena Coding | 1434 | 1459 |
| ALE-Bench | 344.82 | 1,150 |
| SWE-bench Verified (bash only) | 54.2% | — |
| LMArena WebDev | — | 1375 |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Not comparable
GLM-4.5: —, Grok 4.20 (Non-Reasoning): 34.4 (#46)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Terminal-Bench | — | 57.3% |
| τ²-bench Banking | — | 18% |
| LMArena Search | — | 1189 |
| Vending-Bench 2 | — | 4,663 |
Reasoning Grok 4.20 (Non-Reasoning) leads
GLM-4.5: 28.6 (#100), Grok 4.20 (Non-Reasoning): 52.3 (#32)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Kagi LLM Benchmark | 57.9% | 75% |
| LMArena Hard Prompts | 1429 | 1451 |
| ARC-AGI-2 | — | 65.1% |
| NYT Connections (extended) | — | 85.4% |
| ARC-AGI-1 | — | 89.5% |
| Chess Puzzles | — | 24% |
| Thematic Generalization | — | 63.8% |
| DTBench | — | 90.1% |
| LMCA | — | 38.7% |
| Epoch Capabilities Index | — | 151.98 |
| ForecastBench | — | 61.4 |
Math Grok 4.20 (Non-Reasoning) leads
GLM-4.5: 39.0 (#116), Grok 4.20 (Non-Reasoning): 48.2 (#65)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Math | 1427 | 1455 |
| FrontierMath (Tiers 1-3) | — | 44.9% |
| FrontierMath Tier 4 | — | 17.1% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| ProofBench | — | 14% |
Knowledge Grok 4.20 (Non-Reasoning) leads
GLM-4.5: 35.9 (#179), Grok 4.20 (Non-Reasoning): 52.8 (#60)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Expert | 1433 | 1439 |
| GPQA Diamond | — | 89.3% |
| Humanity's Last Exam | 8.3% | — |
| SimpleQA Verified | — | 30.2% |
| Confabulations | 11.3% | — |
Multimodal Not comparable
GLM-4.5: —, Grok 4.20 (Non-Reasoning): 33.3 (#98)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Vision | — | 1263 |
| Blueprint-Bench 2 | — | 0% |
| LMArena Document | — | 1416 |
Multilingual Grok 4.20 (Non-Reasoning) leads
GLM-4.5: 52.8 (#77), Grok 4.20 (Non-Reasoning): 54.5 (#40)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Non-English | 1417 | 1441 |
| LMArena Chinese | 1465 | 1481 |
| LMArena French | 1418 | 1476 |
| LMArena German | 1407 | 1465 |
| LMArena Japanese | 1415 | 1449 |
| LMArena Korean | 1380 | 1417 |
| LMArena Russian | 1414 | 1458 |
| LMArena Spanish | 1454 | 1443 |
Instruction Following Too close to call
GLM-4.5: 74.1 (#104), Grok 4.20 (Non-Reasoning): 74.8 (#83)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Instruction Following | 1404 | 1420 |
Long Context Grok 4.20 (Non-Reasoning) leads
GLM-4.5: 38.2 (#201), Grok 4.20 (Non-Reasoning): 45.5 (#34)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Longer Query | 1412 | 1437 |
| Fiction.LiveBench | 58.3% | — |
| CL-bench | — | 22.2% |
| CL-bench Life | — | 11.9% |
Writing & Preference Grok 4.20 (Non-Reasoning) leads
GLM-4.5: 57.5 (#127), Grok 4.20 (Non-Reasoning): 65.7 (#44)
| Benchmark | GLM-4.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Text | 1430 | 1451 |
| LMArena Creative Writing | 1395 | 1438 |
| EQ-Bench Creative Writing | 1343 | 1574 |
| LMArena Multi-Turn | 1415 | 1456 |
| Short-Story Creative Writing | 73.4% | — |
Frequently asked questions
Is GLM-4.5 better than Grok 4.20 (Non-Reasoning)?
Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.6 to 42.0 on the Noometry Index. GLM-4.5 costs 1.6× less per token, which makes it the better buy when Grok 4.20 (Non-Reasoning)'s lead doesn't matter for your workload.
Which is cheaper, GLM-4.5 or Grok 4.20 (Non-Reasoning)?
GLM-4.5 is cheaper. It lists at $0.60 per million input tokens and $2.20 per million output tokens; Grok 4.20 (Non-Reasoning) lists at $1.25 and $2.50.
Is GLM-4.5 or Grok 4.20 (Non-Reasoning) better for coding?
They score almost the same on coding (41.4 vs 42.1); test both on your own repository before choosing.
Which has the bigger context window?
Grok 4.20 (Non-Reasoning) does, with 1M tokens against 131K.
How many benchmarks do GLM-4.5 and Grok 4.20 (Non-Reasoning) share?
21 benchmarks have published results for both models. GLM-4.5 has 27 scored results on Noometry and Grok 4.20 (Non-Reasoning) has 46.