# GPT-5.5 Pro vs Grok-3 mini

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-grok-3-mini
- Last updated: 2026-10-12
- Shared benchmarks: 6

## Summary

- They share 6 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Grok-3 mini in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 13.6.
- The biggest single-benchmark swing is ARC-AGI-2: 84.6% for GPT-5.5 Pro and 0.4% for Grok-3 mini.

## Snapshot

| | GPT-5.5 Pro | Grok-3 mini |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 64.3 | 41.2 |
| Rank | 8 | 141 |
| Context | 1.05M | — |
| Input $/M | $30 | — |
| Output $/M | $180 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Pro: —
- Grok-3 mini: 40.8 (#131)

| Benchmark | GPT-5.5 Pro | Grok-3 mini |
|---|---|---|
| Aider Polyglot | — | 49.3% |
| WeirdML | — | 42.6% |
| LMArena Coding | — | 1379 |

## Reasoning

- GPT-5.5 Pro: 73.3 (#10)
- Grok-3 mini: 13.6 (#334)

| Benchmark | GPT-5.5 Pro | Grok-3 mini |
|---|---|---|
| ARC-AGI-2 | 84.6% | 0.4% |
| ARC-AGI-1 | 96.5% | 16.5% |
| Epoch Capabilities Index | 162.07 | 140.35 |
| SimpleBench | 76.9% | — |
| Kagi LLM Benchmark | — | 61.3% |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1375 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |

## Math

- GPT-5.5 Pro: 84.0 (#10)
- Grok-3 mini: 42.1 (#85)

| Benchmark | GPT-5.5 Pro | Grok-3 mini |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 77.8% |
| FrontierMath (Feb 2025 set) | 52.4% | 5.9% |
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| Omni-MATH | — | 31.8% |
| LMArena Math | — | 1386 |
| MATH Level 5 | — | 90.9% |
| FrontierMath Tier 4 (v1) | 39.6% | — |

## Knowledge

- GPT-5.5 Pro: 64.1 (#19)
- Grok-3 mini: 46.4 (#81)

| Benchmark | GPT-5.5 Pro | Grok-3 mini |
|---|---|---|
| GPQA Diamond | 93.9% | 76.3% |
| MMLU-Pro | — | 79.9% |
| Confabulations | — | 10.8% |
| GPQA (HELM) | — | 67.5% |
| LMArena Expert | — | 1395 |

## Multilingual

- GPT-5.5 Pro: —
- Grok-3 mini: 48.1 (#145)

| Benchmark | GPT-5.5 Pro | Grok-3 mini |
|---|---|---|
| LMArena Non-English | — | 1352 |
| LMArena Chinese | — | 1387 |
| LMArena French | — | 1357 |
| LMArena German | — | 1349 |
| LMArena Japanese | — | 1342 |
| LMArena Korean | — | 1335 |
| LMArena Russian | — | 1353 |
| LMArena Spanish | — | 1381 |

## Instruction Following

- GPT-5.5 Pro: —
- Grok-3 mini: 78.5 (#9)

| Benchmark | GPT-5.5 Pro | Grok-3 mini |
|---|---|---|
| IFEval | — | 95.1% |
| LMArena Instruction Following | — | 1357 |

## Long Context

- GPT-5.5 Pro: —
- Grok-3 mini: 41.0 (#147)

| Benchmark | GPT-5.5 Pro | Grok-3 mini |
|---|---|---|
| Fiction.LiveBench | — | 66.7% |
| LMArena Longer Query | — | 1372 |

## Writing & Preference

- GPT-5.5 Pro: —
- Grok-3 mini: 52.5 (#169)

| Benchmark | GPT-5.5 Pro | Grok-3 mini |
|---|---|---|
| LMArena Text | — | 1370 |
| LMArena Creative Writing | — | 1342 |
| Short-Story Creative Writing | — | 73.5% |
| WildBench | — | 65.1% |
| LMArena Multi-Turn | — | 1355 |

## FAQ

### Is GPT-5.5 Pro better than Grok-3 mini?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.2 on the Noometry Index.

### How many benchmarks do GPT-5.5 Pro and Grok-3 mini share?

6 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Grok-3 mini has 35.