# GPT-6 Astra vs Grok 3

> GPT-6 Astra is the stronger model overall, scoring 70.3 to 39.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-6-astra-vs-grok-3
- Last updated: 2026-10-10
- Shared benchmarks: 23

## Summary

- They share 23 benchmarks with published results for both. GPT-6 Astra scores higher in 9 categories and Grok 3 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Astra leads 85.1 to 13.8.
- The biggest single-benchmark swing is ARC-AGI-2: 95% for GPT-6 Astra and 0% for Grok 3.

## Snapshot

| | GPT-6 Astra | Grok 3 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 70.3 | 39.6 |
| Rank | 1 | 150 |
| Context | 1.05M | — |
| Input $/M | $10 | — |
| Output $/M | $50 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-6 Astra: 70.5 (#3)
- Grok 3: 41.5 (#113)

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| WeirdML | 93.6% | 37.2% |
| LMArena Coding | 1488 | 1432 |
| DeepSWE | 74.1% | — |
| FrontierCode | 53.3% | — |
| Aider Polyglot | — | 53.3% |
| LMArena WebDev | 1792 | — |
| FrontierSWE | 65.5% | — |
| SciCode | 56.5% | — |
| MirrorCode | 46.7% | — |
| ALE-Bench | 2,951 | — |

## Agentic & Tool Use

- GPT-6 Astra: 52.3 (#3)
- Grok 3: 30.2 (#69)

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| BALROG | 68.3% | 29.5% |
| APEX-Agents | 64.7% | — |
| Remote Labor Index | 20.8% | — |
| Vending-Bench 2 | 15,515 | — |

## Reasoning

- GPT-6 Astra: 85.1 (#1)
- Grok 3: 13.8 (#322)

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| ARC-AGI-2 | 95% | 0% |
| ARC-AGI-1 | 98.5% | 5.5% |
| LMArena Hard Prompts | 1464 | 1433 |
| Epoch Capabilities Index | 166.6 | 138.34 |
| SimpleBench | — | 36.1% |
| Kagi LLM Benchmark | — | 61.3% |
| NYT Connections (extended) | 98.1% | — |
| CritPt | 31.7% | — |
| Chess Puzzles | 72% | — |
| EBR-Bench | 76.2% | — |
| Mystery Game Puzzles | 84% | — |
| DTBench | 97.3% | — |
| LMCA | 64.4% | — |
| Bench to the Future 3 | 0.14 | — |

## Math

- GPT-6 Astra: 93.4 (#1)
- Grok 3: 36.2 (#122)

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 55.6% |
| LMArena Math | 1463 | 1390 |
| FrontierMath (Tiers 1-3) | 93.7% | — |
| FrontierMath Tier 4 | 97.6% | — |
| ProofBench | 99% | — |
| Omni-MATH | — | 46.4% |
| MATH Level 5 | — | 88.7% |
| FrontierMath (Feb 2025 set) | — | 3.8% |
| FrontierMath Erdős | 2.9% | — |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- GPT-6 Astra: 75.3 (#1)
- Grok 3: 46.0 (#76)

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| GPQA Diamond | 95.8% | 75.8% |
| Vectara Hallucination Rate | 8.7% | 5.8% |
| LMArena Expert | 1486 | 1420 |
| Humanity's Last Exam | 54.8% | — |
| SimpleQA Verified | 75.6% | — |
| MMLU-Pro | — | 78.8% |
| Confabulations | — | 14.2% |
| GPQA (HELM) | — | 65% |

## Multimodal

- GPT-6 Astra: 55.1 (#3)
- Grok 3: —

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| LMArena Vision | 1280 | — |
| Blueprint-Bench 2 | 49.7% | — |
| Furniture Assembly | 80% | — |
| LMArena Document | 1468 | — |

## Multilingual

- GPT-6 Astra: 54.0 (#53)
- Grok 3: 52.5 (#81)

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| LMArena Non-English | 1431 | 1411 |
| LMArena Chinese | 1495 | 1448 |
| LMArena French | 1467 | 1460 |
| LMArena Russian | 1434 | 1416 |
| LMArena Spanish | 1412 | 1417 |
| LMArena German | — | 1431 |
| LMArena Japanese | — | 1389 |
| LMArena Korean | — | 1374 |

## Instruction Following

- GPT-6 Astra: 76.6 (#37)
- Grok 3: 75.2 (#69)

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| LMArena Instruction Following | 1454 | 1409 |
| IFEval | — | 88.4% |

## Long Context

- GPT-6 Astra: 44.7 (#57)
- Grok 3: 38.7 (#187)

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| LMArena Longer Query | 1460 | 1439 |
| Fiction.LiveBench | — | 58.3% |

## Writing & Preference

- GPT-6 Astra: 75.7 (#7)
- Grok 3: 56.0 (#136)

| Benchmark | GPT-6 Astra | Grok 3 |
|---|---|---|
| LMArena Text | 1443 | 1426 |
| LMArena Creative Writing | 1423 | 1414 |
| EQ-Bench Creative Writing | 2173 | 1186 |
| LMArena Multi-Turn | 1457 | 1424 |
| Short-Story Creative Writing | — | 76.4% |
| WildBench | — | 84.9% |

## FAQ

### Is GPT-6 Astra better than Grok 3?

GPT-6 Astra is the stronger model overall, scoring 70.3 to 39.6 on the Noometry Index.

### Is GPT-6 Astra or Grok 3 better for coding?

GPT-6 Astra scores higher on coding benchmarks: 70.5 versus 41.5 in the Noometry coding category.

### How many benchmarks do GPT-6 Astra and Grok 3 share?

23 benchmarks have published results for both models. GPT-6 Astra has 51 scored results on Noometry and Grok 3 has 40.