# GPT-5.4 mini vs Grok 4 Fast

> GPT-5.4 mini is the stronger model overall, scoring 44.8 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-4-mini-vs-grok-4-fast
- Last updated: 2026-10-10
- Shared benchmarks: 26

## Summary

- They share 26 benchmarks with published results for both. GPT-5.4 mini scores higher in 8 categories and Grok 4 Fast in 1 category; 6 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 42.9.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 37.9% for GPT-5.4 mini and 66.1% for Grok 4 Fast.

## Snapshot

| | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 44.8 | 39.0 |
| Rank | 69 | 164 |
| Context | 400K | — |
| Input $/M | $0.75 | — |
| Output $/M | $4.50 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.4 mini: 45.0 (#67)
- Grok 4 Fast: 32.3 (#264)

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | 1397 | 1160 |
| WeirdML | 60.3% | 42.9% |
| LMArena Coding | 1438 | 1429 |
| FrontierCode | 27% | — |
| SciCode | 49.9% | — |
| ALE-Bench | 1,189 | — |

## Agentic & Tool Use

- GPT-5.4 mini: 29.6 (#74)
- Grok 4 Fast: 29.3 (#80)

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| DeepResearch Bench | 36.3% | — |
| LMArena Search | — | 1171 |

## Reasoning

- GPT-5.4 mini: 30.3 (#77)
- Grok 4 Fast: 22.5 (#179)

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| ARC-AGI-2 | 18.9% | 5.3% |
| Kagi LLM Benchmark | 37.9% | 66.1% |
| ARC-AGI-1 | 63.7% | 48.5% |
| LMArena Hard Prompts | 1424 | 1413 |
| DTBench | 80% | 82.7% |
| Epoch Capabilities Index | 148.83 | 144.21 |
| ForecastBench | 57 | 60.5 |
| NYT Connections (extended) | 61.8% | — |
| CritPt | 10% | — |
| Chess Puzzles | 24% | — |
| Thematic Generalization | 61.7% | — |
| Mystery Game Puzzles | 11% | — |
| LMCA | 40.8% | — |

## Math

- GPT-5.4 mini: 45.4 (#63)
- Grok 4 Fast: 36.1 (#126)

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1418 | 1419 |
| FrontierMath (Tiers 1-3) | 51.2% | — |
| FrontierMath Tier 4 | 9.8% | — |
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| ProofBench | 21% | — |
| FrontierMath (Feb 2025 set) | 28.3% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- GPT-5.4 mini: 51.4 (#62)
- Grok 4 Fast: 31.5 (#211)

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | 5.5% | 19.7% |
| LMArena Expert | 1434 | 1411 |
| GPQA Diamond | 86.9% | — |
| SimpleQA Verified | 29.4% | — |

## Multimodal

- GPT-5.4 mini: 39.0 (#51)
- Grok 4 Fast: —

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1245 | — |

## Multilingual

- GPT-5.4 mini: 52.1 (#94)
- Grok 4 Fast: 51.5 (#106)

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1405 | 1397 |
| LMArena Chinese | 1446 | 1458 |
| LMArena French | 1440 | 1433 |
| LMArena German | 1407 | 1383 |
| LMArena Japanese | 1375 | 1358 |
| LMArena Korean | 1369 | 1359 |
| LMArena Russian | 1417 | 1387 |
| LMArena Spanish | 1403 | 1414 |

## Instruction Following

- GPT-5.4 mini: 74.3 (#99)
- Grok 4 Fast: 73.4 (#116)

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1405 | 1388 |

## Long Context

- GPT-5.4 mini: 42.9 (#107)
- Grok 4 Fast: 63.2 (#3)

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1407 | 1415 |
| Fiction.LiveBench | — | 94.4% |

## Writing & Preference

- GPT-5.4 mini: 64.2 (#56)
- Grok 4 Fast: 60.2 (#96)

| Benchmark | GPT-5.4 mini | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1411 | 1407 |
| LMArena Creative Writing | 1370 | 1388 |
| LMArena Multi-Turn | 1429 | 1414 |
| EQ-Bench Creative Writing | 1665 | — |

## FAQ

### Is GPT-5.4 mini better than Grok 4 Fast?

GPT-5.4 mini is the stronger model overall, scoring 44.8 to 39.0 on the Noometry Index.

### Is GPT-5.4 mini or Grok 4 Fast better for coding?

GPT-5.4 mini scores higher on coding benchmarks: 45.0 versus 32.3 in the Noometry coding category.

### How many benchmarks do GPT-5.4 mini and Grok 4 Fast share?

26 benchmarks have published results for both models. GPT-5.4 mini has 46 scored results on Noometry and Grok 4 Fast has 30.