# Grok 4 Fast vs Inkling

> Inkling is the stronger model overall, scoring 44.1 to 39.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-inkling
- Last updated: 2026-10-11
- Shared benchmarks: 24

## Summary

- They share 24 benchmarks with published results for both. Grok 4 Fast scores higher in 2 categories and Inkling in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Inkling leads 55.1 to 32.0.
- The biggest single-benchmark swing is ARC-AGI-2: 5.3% for Grok 4 Fast and 36.5% for Inkling.
- Inkling has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4 Fast | Inkling |
|---|---|---|
| Provider | xAI | Thinking Machines Lab |
| Noometry Index | 39.4 | 44.1 |
| Rank | 167 | 80 |
| Context | — | 66K |
| Input $/M | — | $1.87 |
| Output $/M | — | $4.68 |
| Weights | Proprietary | Open |

## Coding

- Grok 4 Fast: 32.5 (#271)
- Inkling: 34.5 (#234)

| Benchmark | Grok 4 Fast | Inkling |
|---|---|---|
| LMArena WebDev | 1159 | 1413 |
| WeirdML | 42.9% | 32.3% |
| LMArena Coding | 1429 | 1464 |
| FrontierCode | — | 14% |
| FrontierSWE | — | 4.1% |
| SciCode | — | 47% |
| ALE-Bench | — | 946 |

## Agentic & Tool Use

- Grok 4 Fast: 29.5 (#86)
- Inkling: 29.6 (#85)

| Benchmark | Grok 4 Fast | Inkling |
|---|---|---|
| τ²-bench Banking | 15.7% | 25% |
| APEX-Agents | — | 33.8% |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |

## Reasoning

- Grok 4 Fast: 22.2 (#201)
- Inkling: 40.4 (#56)

| Benchmark | Grok 4 Fast | Inkling |
|---|---|---|
| ARC-AGI-2 | 5.3% | 36.5% |
| ARC-AGI-1 | 48.5% | 79.5% |
| LMArena Hard Prompts | 1412 | 1451 |
| DTBench | 82.7% | 87.5% |
| Epoch Capabilities Index | 144.2 | 148.54 |
| SimpleBench | — | 50% |
| Kagi LLM Benchmark | 66.1% | — |
| CritPt | — | 5.4% |
| Chess Puzzles | — | 21% |
| LMCA | — | 37.6% |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 38.9 (#123)
- Inkling: 31.3 (#225)

| Benchmark | Grok 4 Fast | Inkling |
|---|---|---|
| LMArena Math | 1419 | 1479 |
| FrontierMath (Tiers 1-3) | — | 33.3% |
| FrontierMath Tier 4 | — | 4.9% |
| OTIS Mock AIME 2024-2025 | — | 88.9% |
| ProofBench | — | 0% |

## Knowledge

- Grok 4 Fast: 32.0 (#214)
- Inkling: 55.1 (#49)

| Benchmark | Grok 4 Fast | Inkling |
|---|---|---|
| LMArena Expert | 1411 | 1465 |
| GPQA Diamond | — | 88.3% |
| SimpleQA Verified | — | 40.3% |
| Vectara Hallucination Rate | 19.7% | — |

## Multilingual

- Grok 4 Fast: 51.3 (#111)
- Inkling: 54.0 (#52)

| Benchmark | Grok 4 Fast | Inkling |
|---|---|---|
| LMArena Non-English | 1396 | 1434 |
| LMArena Chinese | 1457 | 1490 |
| LMArena French | 1431 | 1458 |
| LMArena German | 1383 | 1446 |
| LMArena Japanese | 1352 | 1429 |
| LMArena Korean | 1357 | 1404 |
| LMArena Russian | 1389 | 1429 |
| LMArena Spanish | 1415 | 1448 |

## Instruction Following

- Grok 4 Fast: 73.2 (#121)
- Inkling: 75.1 (#71)

| Benchmark | Grok 4 Fast | Inkling |
|---|---|---|
| LMArena Instruction Following | 1387 | 1426 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- Inkling: 43.8 (#86)

| Benchmark | Grok 4 Fast | Inkling |
|---|---|---|
| LMArena Longer Query | 1415 | 1434 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4 Fast: 60.0 (#102)
- Inkling: 65.2 (#51)

| Benchmark | Grok 4 Fast | Inkling |
|---|---|---|
| LMArena Text | 1407 | 1441 |
| LMArena Creative Writing | 1387 | 1387 |
| LMArena Multi-Turn | 1414 | 1436 |
| EQ-Bench Creative Writing | — | 1611 |
| EQ-Bench 4 | — | 1226 |

## FAQ

### Is Grok 4 Fast better than Inkling?

Inkling is the stronger model overall, scoring 44.1 to 39.4 on the Noometry Index.

### Is Grok 4 Fast or Inkling better for coding?

Inkling scores higher on coding benchmarks: 34.5 versus 32.5 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and Inkling share?

24 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Inkling has 41.