# GPT-5.5 Instant vs Sonar

> GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 37.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-sonar
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in writing & preference, where GPT-5.5 Instant leads 62.0 to 52.6.

## Snapshot

| | GPT-5.5 Instant | Sonar |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Noometry Index | 42.5 | 37.8 |
| Rank | 99 | 184 |
| Context | — | 128K |
| Input $/M | — | $1 |
| Output $/M | — | $1 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Instant: 43.7 (#73)
- Sonar: 35.1 (#217)

| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| SciCode | 48.6% | — |
| LiveBench Coding | — | 35.1% |
| LMArena Coding | 1433 | — |

## Reasoning

- GPT-5.5 Instant: 24.2 (#149)
- Sonar: 20.3 (#221)

| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| LiveBench Reasoning | — | 46.3% |
| LMArena Hard Prompts | 1426 | — |
| LiveBench Data Analysis | — | 37.9% |
| Epoch Capabilities Index | 142.48 | — |
| LiveBench | — | 46.9% |

## Math

- GPT-5.5 Instant: 26.1 (#241)
- Sonar: 31.3 (#197)

| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| LiveBench Math | — | 41.6% |
| LMArena Math | 1420 | — |

## Knowledge

- GPT-5.5 Instant: 48.9 (#68)
- Sonar: —

| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| GPQA Diamond | 82.5% | — |
| LMArena Expert | 1409 | — |

## Multimodal

- GPT-5.5 Instant: 39.3 (#48)
- Sonar: —

| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.5 Instant: 53.0 (#76)
- Sonar: —

| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LMArena Non-English | 1417 | — |
| LMArena Chinese | 1457 | — |
| LMArena French | 1428 | — |
| LMArena German | 1410 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1393 | — |
| LMArena Russian | 1430 | — |
| LMArena Spanish | 1430 | — |

## Instruction Following

- GPT-5.5 Instant: 74.4 (#94)
- Sonar: 71.5 (#146)

| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
| LMArena Instruction Following | 1407 | — |

## Long Context

- GPT-5.5 Instant: 43.4 (#92)
- Sonar: —

| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LMArena Longer Query | 1422 | — |

## Writing & Preference

- GPT-5.5 Instant: 62.0 (#81)
- Sonar: 52.6 (#166)

| Benchmark | GPT-5.5 Instant | Sonar |
|---|---|---|
| LMArena Text | 1419 | — |
| LMArena Creative Writing | 1420 | — |
| LMArena Multi-Turn | 1434 | — |
| LiveBench Language | — | 44.1% |

## FAQ

### Is GPT-5.5 Instant better than Sonar?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 37.8 on the Noometry Index.

### Is GPT-5.5 Instant or Sonar better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 35.1 in the Noometry coding category.

### How many benchmarks do GPT-5.5 Instant and Sonar share?

0 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Sonar has 7.