# Grok 4.5 vs o4-mini

> Grok 4.5 is the stronger model overall, scoring 55.0 to 41.6 on the Noometry Index. o4-mini costs 1.6× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/grok-4-5-vs-o4-mini
- Last updated: 2026-10-11
- Shared benchmarks: 34

## Summary

- They share 34 benchmarks with published results for both. Grok 4.5 scores higher in 8 categories and o4-mini in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 24.6.
- The biggest single-benchmark swing is ARC-AGI-2: 52.6% for Grok 4.5 and 6.1% for o4-mini.
- o4-mini is cheaper at $1.10 / $4.40 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Grok 4.5 accepts more context: 500K tokens versus 200K.

## Snapshot

| | Grok 4.5 | o4-mini |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 55.0 | 41.6 |
| Rank | 25 | 132 |
| Context | 500K | 200K |
| Input $/M | $2 | $1.10 |
| Output $/M | $6 | $4.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.5: 52.2 (#35)
- o4-mini: 40.9 (#127)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| WeirdML | 46.4% | 52.6% |
| LMArena Coding | 1474 | 1368 |
| ALE-Bench | 1,309 | 826.17 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.4% | — |
| SWE-bench Verified (bash only) | — | 45% |
| Aider Polyglot | — | 72% |
| LMArena WebDev | 1553 | — |
| SciCode | 54.1% | — |
| GSO | — | 3.6% |
| CadEval | — | 62% |
| AlgoTune | — | 1.72 |

## Agentic & Tool Use

- Grok 4.5: 44.4 (#17)
- o4-mini: 32.6 (#61)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| APEX-Agents | 56.2% | — |
| Berkeley Function Calling Leaderboard | — | 53.2% |
| GDPval | — | 25.3% |
| τ²-bench Banking | 47.9% | — |
| PostTrainBench | 23.4% | — |
| GBAEval | 65.4% | — |
| GDP.pdf | 14% | — |
| LMArena Search | 1213 | — |
| METR Time Horizons | — | 63.9% |
| Vending-Bench 2 | 3,887 | — |

## Reasoning

- Grok 4.5: 56.1 (#25)
- o4-mini: 24.6 (#162)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| ARC-AGI-2 | 52.6% | 6.1% |
| SimpleBench | 70% | 38.7% |
| Kagi LLM Benchmark | 83.5% | 67.6% |
| ARC-AGI-1 | 87.2% | 58.7% |
| CritPt | 15.4% | 0.6% |
| Chess Puzzles | 36% | 26% |
| LMArena Hard Prompts | 1462 | 1351 |
| DTBench | 96.5% | 77.6% |
| LMCA | 45.2% | 26.5% |
| Epoch Capabilities Index | 153.92 | 145.64 |
| NYT Connections (extended) | 79.9% | — |
| EnigmaEval | — | 9.2% |
| Mystery Game Puzzles | — | 5% |
| Surface Evolver Bench | 74.4% | — |
| ForecastBench | — | 61.8 |

## Math

- Grok 4.5: 60.9 (#35)
- o4-mini: 40.8 (#89)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 57.2% | 36.1% |
| FrontierMath Tier 4 | 24.4% | 4.9% |
| OTIS Mock AIME 2024-2025 | 97.8% | 81.7% |
| LMArena Math | 1459 | 1389 |
| ProofBench | 31% | — |
| Omni-MATH | — | 72% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 24.8% |
| FrontierMath Tier 4 (v1) | — | 6.3% |

## Knowledge

- Grok 4.5: 62.3 (#24)
- o4-mini: 43.6 (#91)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| GPQA Diamond | 93.4% | 79.6% |
| SimpleQA Verified | 48.3% | 19.6% |
| LMArena Expert | 1466 | 1343 |
| Humanity's Last Exam | — | 18.1% |
| MMLU-Pro | — | 82% |
| Confabulations | — | 15.8% |
| Vectara Hallucination Rate | — | 18.6% |
| GPQA (HELM) | — | 73.5% |

## Multimodal

- Grok 4.5: 37.6 (#72)
- o4-mini: 40.2 (#49)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| LMArena Vision | 1288 | 1194 |
| GeoBench | — | 64% |
| VPCT | — | 57.5% |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |
| LMArena Document | 1452 | — |

## Multilingual

- Grok 4.5: 54.4 (#42)
- o4-mini: 47.0 (#154)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| LMArena Non-English | 1440 | 1337 |
| LMArena Chinese | 1496 | 1354 |
| LMArena French | 1456 | 1364 |
| LMArena German | 1446 | 1336 |
| LMArena Japanese | 1428 | 1308 |
| LMArena Korean | 1404 | 1312 |
| LMArena Russian | 1448 | 1334 |
| LMArena Spanish | 1450 | 1347 |

## Instruction Following

- Grok 4.5: 76.0 (#48)
- o4-mini: 75.2 (#68)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| LMArena Instruction Following | 1446 | 1321 |
| IFEval | — | 92.8% |

## Long Context

- Grok 4.5: 44.8 (#56)
- o4-mini: 45.5 (#33)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| LMArena Longer Query | 1463 | 1315 |
| Fiction.LiveBench | — | 77.8% |

## Writing & Preference

- Grok 4.5: 65.8 (#42)
- o4-mini: 54.0 (#152)

| Benchmark | Grok 4.5 | o4-mini |
|---|---|---|
| LMArena Text | 1448 | 1353 |
| LMArena Creative Writing | 1442 | 1294 |
| LMArena Multi-Turn | 1456 | 1350 |
| Short-Story Creative Writing | — | 75% |
| EQ-Bench Creative Writing | 1579 | — |
| WildBench | — | 85.4% |

## FAQ

### Is Grok 4.5 better than o4-mini?

Grok 4.5 is the stronger model overall, scoring 55.0 to 41.6 on the Noometry Index. o4-mini costs 1.6× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

### Which is cheaper, Grok 4.5 or o4-mini?

o4-mini is cheaper. It lists at $1.10 per million input tokens and $4.40 per million output tokens; Grok 4.5 lists at $2 and $6.

### Is Grok 4.5 or o4-mini better for coding?

Grok 4.5 scores higher on coding benchmarks: 52.2 versus 40.9 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.5 does, with 500K tokens against 200K.

### How many benchmarks do Grok 4.5 and o4-mini share?

34 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and o4-mini has 60.