# GPT-5.5 Instant vs Mixtral 8x22B

> GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 26.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-mixtral-8x22b
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. GPT-5.5 Instant scores higher in 8 categories and Mixtral 8x22B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 15.1.
- The biggest single-benchmark swing is GPQA Diamond: 82.5% for GPT-5.5 Instant and 34.1% for Mixtral 8x22B.
- Mixtral 8x22B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 42.5 | 26.7 |
| Rank | 99 | 330 |
| Context | — | 64K |
| Input $/M | — | $2 |
| Output $/M | — | $6 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Instant: 43.7 (#73)
- Mixtral 8x22B: 23.8 (#324)

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| LMArena Coding | 1433 | 1166 |
| SciCode | 48.6% | — |
| WeirdML | — | 3.2% |
| BigCodeBench Instruct | — | 40.6% |
| BigCodeBench Complete | — | 50.2% |
| HumanEval+ | — | 72% |
| MBPP+ | — | 64.3% |

## Agentic & Tool Use

- GPT-5.5 Instant: —
- Mixtral 8x22B: 22.8 (#119)

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| Cybench | — | 7.5% |

## Reasoning

- GPT-5.5 Instant: 24.2 (#149)
- Mixtral 8x22B: 19.1 (#246)

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1150 |
| Epoch Capabilities Index | 142.48 | 122 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| DTBench | — | 55.1% |
| ForecastBench | — | 56.3 |

## Math

- GPT-5.5 Instant: 26.1 (#241)
- Mixtral 8x22B: 21.2 (#271)

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| LMArena Math | 1420 | 1184 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| Omni-MATH | — | 16.3% |
| MATH Level 5 | — | 24.2% |

## Knowledge

- GPT-5.5 Instant: 48.9 (#68)
- Mixtral 8x22B: 15.1 (#288)

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| GPQA Diamond | 82.5% | 34.1% |
| LMArena Expert | 1409 | 1113 |
| MMLU-Pro | — | 46% |
| GPQA (HELM) | — | 33.4% |
| MMLU | — | 77.8% |

## Multimodal

- GPT-5.5 Instant: 39.3 (#48)
- Mixtral 8x22B: —

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.5 Instant: 53.0 (#76)
- Mixtral 8x22B: 32.9 (#250)

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| LMArena Non-English | 1417 | 1128 |
| LMArena Chinese | 1457 | 1116 |
| LMArena French | 1428 | 1165 |
| LMArena German | 1410 | 1141 |
| LMArena Japanese | 1408 | 1037 |
| LMArena Korean | 1393 | 1056 |
| LMArena Russian | 1430 | 1158 |
| LMArena Spanish | 1430 | 1150 |

## Instruction Following

- GPT-5.5 Instant: 74.4 (#94)
- Mixtral 8x22B: 57.9 (#261)

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| LMArena Instruction Following | 1407 | 1147 |
| IFEval | — | 72.4% |

## Long Context

- GPT-5.5 Instant: 43.4 (#92)
- Mixtral 8x22B: 34.6 (#242)

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| LMArena Longer Query | 1422 | 1144 |

## Writing & Preference

- GPT-5.5 Instant: 62.0 (#81)
- Mixtral 8x22B: 37.1 (#257)

| Benchmark | GPT-5.5 Instant | Mixtral 8x22B |
|---|---|---|
| LMArena Text | 1419 | 1162 |
| LMArena Creative Writing | 1420 | 1141 |
| LMArena Multi-Turn | 1434 | 1130 |
| WildBench | — | 71.1% |

## FAQ

### Is GPT-5.5 Instant better than Mixtral 8x22B?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 26.7 on the Noometry Index.

### Is GPT-5.5 Instant or Mixtral 8x22B better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 23.8 in the Noometry coding category.

### How many benchmarks do GPT-5.5 Instant and Mixtral 8x22B share?

19 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Mixtral 8x22B has 34.