# GPT-6 Astra vs Mixtral 8x7B

> GPT-6 Astra is the stronger model overall, scoring 70.3 to 26.8 on the Noometry Index. Mixtral 8x7B costs 29× less per token, which makes it the better buy when GPT-6 Astra's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-6-astra-vs-mixtral-8x7b
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-6 Astra scores higher in 8 categories and Mixtral 8x7B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-6 Astra leads 93.4 to 17.2.
- The biggest single-benchmark swing is GPQA Diamond: 95.8% for GPT-6 Astra and 30.6% for Mixtral 8x7B.
- Mixtral 8x7B is cheaper at $0.70 / $0.70 per million input/output tokens, against $10 / $50 for GPT-6 Astra.
- GPT-6 Astra accepts more context: 1.05M tokens versus 32K.
- Mixtral 8x7B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 70.3 | 26.8 |
| Rank | 1 | 328 |
| Context | 1.05M | 32K |
| Input $/M | $10 | $0.70 |
| Output $/M | $50 | $0.70 |
| Weights | Proprietary | Open |

## Coding

- GPT-6 Astra: 70.5 (#3)
- Mixtral 8x7B: 32.2 (#265)

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| LMArena Coding | 1488 | 1127 |
| DeepSWE | 74.1% | — |
| FrontierCode | 53.3% | — |
| LMArena WebDev | 1792 | — |
| FrontierSWE | 65.5% | — |
| SciCode | 56.5% | — |
| WeirdML | 93.6% | — |
| MirrorCode | 46.7% | — |
| ALE-Bench | 2,951 | — |
| HumanEval+ | — | 39.6% |
| MBPP+ | — | 49.7% |

## Agentic & Tool Use

- GPT-6 Astra: 52.3 (#3)
- Mixtral 8x7B: —

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| APEX-Agents | 64.7% | — |
| Remote Labor Index | 20.8% | — |
| BALROG | 68.3% | — |
| Vending-Bench 2 | 15,515 | — |

## Reasoning

- GPT-6 Astra: 85.1 (#1)
- Mixtral 8x7B: 17.4 (#283)

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| LMArena Hard Prompts | 1464 | 1115 |
| DTBench | 97.3% | 49.6% |
| Epoch Capabilities Index | 166.6 | 118.38 |
| ARC-AGI-2 | 95% | — |
| NYT Connections (extended) | 98.1% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 31.7% | — |
| Chess Puzzles | 72% | — |
| EBR-Bench | 76.2% | — |
| Mystery Game Puzzles | 84% | — |
| LMCA | 64.4% | — |
| Adversarial NLI | — | 55.2% |
| Bench to the Future 3 | 0.14 | — |
| ForecastBench | — | 56.3 |
| HellaSwag | — | 86.7% |
| PIQA | — | 83.6% |
| WinoGrande | — | 77.2% |

## Math

- GPT-6 Astra: 93.4 (#1)
- Mixtral 8x7B: 17.2 (#284)

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| LMArena Math | 1463 | 1147 |
| FrontierMath (Tiers 1-3) | 93.7% | — |
| FrontierMath Tier 4 | 97.6% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 99% | — |
| Omni-MATH | — | 10.5% |
| MATH Level 5 | — | 10% |
| FrontierMath Erdős | 2.9% | — |
| GSM8K | — | 74.4% |

## Knowledge

- GPT-6 Astra: 75.3 (#1)
- Mixtral 8x7B: 11.0 (#296)

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| GPQA Diamond | 95.8% | 30.6% |
| LMArena Expert | 1486 | 1088 |
| Humanity's Last Exam | 54.8% | — |
| SimpleQA Verified | 75.6% | — |
| MMLU-Pro | — | 33.5% |
| Vectara Hallucination Rate | 8.7% | — |
| GPQA (HELM) | — | 29.6% |
| ARC (AI2) Challenge | — | 87.3% |
| MMLU | — | 70.6% |
| OpenBookQA | — | 85.8% |
| TriviaQA | — | 82.2% |

## Multimodal

- GPT-6 Astra: 55.1 (#3)
- Mixtral 8x7B: —

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| LMArena Vision | 1280 | — |
| Blueprint-Bench 2 | 49.7% | — |
| Furniture Assembly | 80% | — |
| LMArena Document | 1468 | — |

## Multilingual

- GPT-6 Astra: 54.0 (#53)
- Mixtral 8x7B: 29.8 (#261)

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| LMArena Non-English | 1431 | 1077 |
| LMArena Chinese | 1495 | 1055 |
| LMArena French | 1467 | 1165 |
| LMArena Russian | 1434 | 1090 |
| LMArena Spanish | 1412 | 1110 |
| LMArena German | — | 1114 |
| LMArena Japanese | — | 931 |
| LMArena Korean | — | 968 |

## Instruction Following

- GPT-6 Astra: 76.6 (#37)
- Mixtral 8x7B: 51.2 (#292)

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| LMArena Instruction Following | 1454 | 1110 |
| IFEval | — | 57.5% |

## Long Context

- GPT-6 Astra: 44.7 (#57)
- Mixtral 8x7B: 33.4 (#255)

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| LMArena Longer Query | 1460 | 1103 |

## Writing & Preference

- GPT-6 Astra: 75.7 (#7)
- Mixtral 8x7B: 34.4 (#265)

| Benchmark | GPT-6 Astra | Mixtral 8x7B |
|---|---|---|
| LMArena Text | 1443 | 1132 |
| LMArena Creative Writing | 1423 | 1109 |
| LMArena Multi-Turn | 1457 | 1115 |
| EQ-Bench Creative Writing | 2173 | — |
| WildBench | — | 67.3% |

## FAQ

### Is GPT-6 Astra better than Mixtral 8x7B?

GPT-6 Astra is the stronger model overall, scoring 70.3 to 26.8 on the Noometry Index. Mixtral 8x7B costs 29× less per token, which makes it the better buy when GPT-6 Astra's lead doesn't matter for your workload.

### Which is cheaper, GPT-6 Astra or Mixtral 8x7B?

Mixtral 8x7B is cheaper. It lists at $0.70 per million input tokens and $0.70 per million output tokens; GPT-6 Astra lists at $10 and $50.

### Is GPT-6 Astra or Mixtral 8x7B better for coding?

GPT-6 Astra scores higher on coding benchmarks: 70.5 versus 32.2 in the Noometry coding category.

### Which has the bigger context window?

GPT-6 Astra does, with 1.05M tokens against 32K.

### How many benchmarks do GPT-6 Astra and Mixtral 8x7B share?

17 benchmarks have published results for both models. GPT-6 Astra has 51 scored results on Noometry and Mixtral 8x7B has 38.