Model comparison
GLM-4.6 vs Grok 4.1 Fast
GLM-4.6 and Grok 4.1 Fast score almost the same on the Noometry Index (41.4 vs 41.4), so choose on price, context window or the category you care about most.
Last verified . 22 shared benchmarks.
Summary
- They share 22 benchmarks with published results for both. GLM-4.6 scores higher in 7 categories and Grok 4.1 Fast in 2 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 23.7.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 9.5% for GLM-4.6 and 17.8% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.60 / $2.20 for GLM-4.6.
- GLM-4.6 accepts more context: 205K tokens versus 128K.
- GLM-4.6 has downloadable open weights; the other is API-only.
Side by side
| GLM-4.6 | Grok 4.1 Fast | |
|---|---|---|
| Provider | Z.ai (Zhipu) | xAI |
| Noometry Index | 41.4 | 41.4 |
| Released | 2025-09-30 | 2025-06-27 |
| Weights | Open | Proprietary |
| Context window | 205K | 128K |
| Max output | 131K | 30K |
| Input $ / M tokens | $0.60 | $0.20 |
| Output $ / M tokens | $2.20 | $0.50 |
| Results tracked | 29 | 32 |
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Category by category
Coding GLM-4.6 leads
GLM-4.6: 40.1 (#148), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1340 | 1242 |
| LMArena Coding | 1449 | 1411 |
| ALE-Bench | 340.82 | 394.93 |
| SWE-bench Verified (bash only) | 55.4% | — |
| SciCode | 38.4% | — |
Agentic & Tool Use Grok 4.1 Fast leads
GLM-4.6: 32.3 (#66), Grok 4.1 Fast: 36.3 (#39)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | 72.4% | 69.6% |
| Terminal-Bench | 24.5% | — |
| τ²-bench Banking | — | 13.1% |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
GLM-4.6: 23.7 (#172), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1440 | 1407 |
| SimpleBench | — | 56% |
| Kagi LLM Benchmark | 47.4% | — |
| NYT Connections (extended) | — | 87.4% |
| CritPt | 1.1% | — |
| DTBench | — | 87.7% |
| ForecastBench | — | 61 |
Math GLM-4.6 leads
GLM-4.6: 39.1 (#111), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1432 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| ProofBench | — | 4% |
| FrontierMath (Feb 2025 set) | 3.8% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |
Knowledge GLM-4.6 leads
GLM-4.6: 40.2 (#124), Grok 4.1 Fast: 33.1 (#207)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 9.5% | 17.8% |
| LMArena Expert | 1431 | 1399 |
Multimodal Not comparable
GLM-4.6: —, Grok 4.1 Fast: 37.0 (#76)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | — | 1201 |
Multilingual GLM-4.6 leads
GLM-4.6: 53.5 (#66), Grok 4.1 Fast: 51.0 (#114)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1426 | 1391 |
| LMArena Chinese | 1499 | 1441 |
| LMArena French | 1459 | 1415 |
| LMArena German | 1447 | 1404 |
| LMArena Japanese | 1393 | 1349 |
| LMArena Korean | 1400 | 1361 |
| LMArena Russian | 1419 | 1387 |
| LMArena Spanish | 1436 | 1413 |
Instruction Following GLM-4.6 leads
GLM-4.6: 74.3 (#98), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1410 | 1376 |
Long Context GLM-4.6 leads
GLM-4.6: 43.4 (#94), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1422 | 1390 |
Writing & Preference GLM-4.6 leads
GLM-4.6: 61.1 (#90), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | GLM-4.6 | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1440 | 1408 |
| LMArena Creative Writing | 1411 | 1394 |
| EQ-Bench Creative Writing | 1411 | 1327 |
| LMArena Multi-Turn | 1427 | 1389 |
Frequently asked questions
Is GLM-4.6 better than Grok 4.1 Fast?
GLM-4.6 and Grok 4.1 Fast score almost the same on the Noometry Index (41.4 vs 41.4), so choose on price, context window or the category you care about most.
Which is cheaper, GLM-4.6 or Grok 4.1 Fast?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; GLM-4.6 lists at $0.60 and $2.20.
Is GLM-4.6 or Grok 4.1 Fast better for coding?
GLM-4.6 scores higher on coding benchmarks: 40.1 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
GLM-4.6 does, with 205K tokens against 128K.
How many benchmarks do GLM-4.6 and Grok 4.1 Fast share?
22 benchmarks have published results for both models. GLM-4.6 has 29 scored results on Noometry and Grok 4.1 Fast has 32.