# GPT-5.5 Instant vs Solar Pro4

> GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 41.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-solar-pro4
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.5 Instant scores higher in 6 categories and Solar Pro4 in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Solar Pro4 leads 36.1 to 26.1.

## Snapshot

| | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| Provider | OpenAI | Upstage |
| Noometry Index | 42.5 | 41.5 |
| Rank | 99 | 123 |
| Context | — | 524K |
| Input $/M | — | $0.30 |
| Output $/M | — | $1.20 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Instant: 43.7 (#73)
- Solar Pro4: 39.9 (#135)

| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Coding | 1433 | 1439 |
| LMArena WebDev | — | 1371 |
| SciCode | 48.6% | — |

## Reasoning

- GPT-5.5 Instant: 24.2 (#149)
- Solar Pro4: 27.3 (#107)

| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1398 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.48 | — |

## Math

- GPT-5.5 Instant: 26.1 (#241)
- Solar Pro4: 36.1 (#129)

| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Math | 1420 | 1418 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |

## Knowledge

- GPT-5.5 Instant: 48.9 (#68)
- Solar Pro4: 39.0 (#128)

| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1409 | 1421 |
| GPQA Diamond | 82.5% | — |

## Multimodal

- GPT-5.5 Instant: 39.3 (#48)
- Solar Pro4: —

| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.5 Instant: 53.0 (#76)
- Solar Pro4: 49.0 (#134)

| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1417 | 1362 |
| LMArena Chinese | 1457 | 1417 |
| LMArena French | 1428 | 1403 |
| LMArena German | 1410 | 1351 |
| LMArena Japanese | 1408 | 1300 |
| LMArena Korean | 1393 | 1383 |
| LMArena Russian | 1430 | 1360 |
| LMArena Spanish | 1430 | 1408 |

## Instruction Following

- GPT-5.5 Instant: 74.4 (#94)
- Solar Pro4: 72.8 (#128)

| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1407 | 1376 |

## Long Context

- GPT-5.5 Instant: 43.4 (#92)
- Solar Pro4: 42.0 (#125)

| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1422 | 1379 |

## Writing & Preference

- GPT-5.5 Instant: 62.0 (#81)
- Solar Pro4: 56.7 (#133)

| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Text | 1419 | 1386 |
| LMArena Creative Writing | 1420 | 1313 |
| LMArena Multi-Turn | 1434 | 1391 |

## FAQ

### Is GPT-5.5 Instant better than Solar Pro4?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 41.5 on the Noometry Index.

### Is GPT-5.5 Instant or Solar Pro4 better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 39.9 in the Noometry coding category.

### How many benchmarks do GPT-5.5 Instant and Solar Pro4 share?

17 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Solar Pro4 has 18.