# Grok 4.1 Fast vs Trinity Large Thinking

> Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 38.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-trinity-large-thinking
- Last updated: 2026-10-10
- Shared benchmarks: 20

## Summary

- They share 20 benchmarks with published results for both. Grok 4.1 Fast scores higher in 5 categories and Trinity Large Thinking in 3 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 16.9.
- The biggest single-benchmark swing is NYT Connections (extended): 87.4% for Grok 4.1 Fast and 16.5% for Trinity Large Thinking.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.25 / $0.80 for Trinity Large Thinking.
- Trinity Large Thinking accepts more context: 262K tokens versus 128K.
- Trinity Large Thinking has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| Provider | xAI | Arcee AI |
| Noometry Index | 41.4 | 38.6 |
| Rank | 136 | 185 |
| Context | 128K | 262K |
| Input $/M | $0.20 | $0.25 |
| Output $/M | $0.50 | $0.80 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 34.1 (#245)
- Trinity Large Thinking: 34.1 (#244)

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| LMArena WebDev | 1242 | 1238 |
| LMArena Coding | 1411 | 1381 |
| SciCode | — | 36.1% |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.3 (#39)
- Trinity Large Thinking: —

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 43.4 (#49)
- Trinity Large Thinking: 16.9 (#298)

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| NYT Connections (extended) | 87.4% | 16.5% |
| LMArena Hard Prompts | 1407 | 1350 |
| SimpleBench | 56% | — |
| CritPt | — | 0.9% |
| Thematic Generalization | — | 41.6% |
| DTBench | 87.7% | — |
| Surface Evolver Bench | — | 15.6% |
| ForecastBench | 61 | — |

## Math

- Grok 4.1 Fast: 31.9 (#221)
- Trinity Large Thinking: 37.6 (#149)

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| LMArena Math | 1408 | 1366 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |

## Knowledge

- Grok 4.1 Fast: 33.1 (#207)
- Trinity Large Thinking: 40.9 (#113)

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| Vectara Hallucination Rate | 17.8% | 6.9% |
| LMArena Expert | 1399 | 1360 |

## Multimodal

- Grok 4.1 Fast: 37.0 (#76)
- Trinity Large Thinking: —

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| LMArena Vision | 1201 | — |

## Multilingual

- Grok 4.1 Fast: 51.0 (#114)
- Trinity Large Thinking: 46.2 (#160)

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| LMArena Non-English | 1391 | 1325 |
| LMArena Chinese | 1441 | 1373 |
| LMArena French | 1415 | 1374 |
| LMArena German | 1404 | 1356 |
| LMArena Japanese | 1349 | 1311 |
| LMArena Korean | 1361 | 1306 |
| LMArena Russian | 1387 | 1337 |
| LMArena Spanish | 1413 | 1357 |

## Instruction Following

- Grok 4.1 Fast: 72.7 (#133)
- Trinity Large Thinking: 70.5 (#162)

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| LMArena Instruction Following | 1376 | 1334 |

## Long Context

- Grok 4.1 Fast: 42.4 (#126)
- Trinity Large Thinking: 41.3 (#144)

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| LMArena Longer Query | 1390 | 1355 |

## Writing & Preference

- Grok 4.1 Fast: 57.2 (#131)
- Trinity Large Thinking: 53.8 (#158)

| Benchmark | Grok 4.1 Fast | Trinity Large Thinking |
|---|---|---|
| LMArena Text | 1408 | 1340 |
| LMArena Creative Writing | 1394 | 1320 |
| LMArena Multi-Turn | 1389 | 1342 |
| EQ-Bench Creative Writing | 1327 | — |

## FAQ

### Is Grok 4.1 Fast better than Trinity Large Thinking?

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 38.6 on the Noometry Index.

### Which is cheaper, Grok 4.1 Fast or Trinity Large Thinking?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Trinity Large Thinking lists at $0.25 and $0.80.

### Is Grok 4.1 Fast or Trinity Large Thinking better for coding?

They score almost the same on coding (34.1 vs 34.1); test both on your own repository before choosing.

### Which has the bigger context window?

Trinity Large Thinking does, with 262K tokens against 128K.

### How many benchmarks do Grok 4.1 Fast and Trinity Large Thinking share?

20 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Trinity Large Thinking has 24.