Model comparison
GPT-5.5 Instant vs Solar Pro4
GPT-5.5 Instant and Solar Pro4 score almost the same on the Noometry Index (42.7 vs 42.1), so choose on price, context window or the category you care about most.
Last verified . 17 shared benchmarks.
UpstageSummary
- 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 38.8 to 26.5.
Side by side
| GPT-5.5 Instant | Solar Pro4 | |
|---|---|---|
| Provider | OpenAI | Upstage |
| Noometry Index | 42.7 | 42.1 |
| Released | 2026-05-05 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | — | 524K |
| Max output | — | 131K |
| Input $ / M tokens | — | $0.30 |
| Output $ / M tokens | — | $1.20 |
| Results tracked | 27 | 18 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-5.5 Instant: 44.3 (#74), Solar Pro4: 40.1 (#149)
| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Coding | 1433 | 1437 |
| LMArena WebDev | — | 1371 |
| SciCode | 48.6% | — |
Reasoning Solar Pro4 leads
GPT-5.5 Instant: 24.9 (#155), Solar Pro4: 28.5 (#104)
| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1399 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.52 | — |
Math Solar Pro4 leads
GPT-5.5 Instant: 26.5 (#259), Solar Pro4: 38.8 (#128)
| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Math | 1420 | 1416 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
Knowledge GPT-5.5 Instant leads
GPT-5.5 Instant: 48.9 (#74), Solar Pro4: 39.8 (#129)
| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1409 | 1427 |
| GPQA Diamond | 82.5% | — |
Multimodal Not comparable
GPT-5.5 Instant: 40.0 (#52), Solar Pro4: —
| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |
Multilingual GPT-5.5 Instant leads
GPT-5.5 Instant: 52.8 (#80), Solar Pro4: 48.7 (#139)
| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1417 | 1361 |
| LMArena Chinese | 1456 | 1415 |
| LMArena French | 1428 | 1397 |
| LMArena German | 1411 | 1364 |
| LMArena Japanese | 1408 | 1309 |
| LMArena Korean | 1392 | 1382 |
| LMArena Russian | 1431 | 1360 |
| LMArena Spanish | 1429 | 1401 |
Instruction Following GPT-5.5 Instant leads
GPT-5.5 Instant: 74.2 (#100), Solar Pro4: 72.7 (#132)
| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1406 | 1377 |
Long Context GPT-5.5 Instant leads
GPT-5.5 Instant: 43.4 (#96), Solar Pro4: 42.1 (#130)
| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1422 | 1381 |
Writing & Preference GPT-5.5 Instant leads
GPT-5.5 Instant: 61.8 (#85), Solar Pro4: 56.5 (#138)
| Benchmark | GPT-5.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Text | 1419 | 1386 |
| LMArena Creative Writing | 1419 | 1316 |
| LMArena Multi-Turn | 1433 | 1385 |
Frequently asked questions
Is GPT-5.5 Instant better than Solar Pro4?
GPT-5.5 Instant and Solar Pro4 score almost the same on the Noometry Index (42.7 vs 42.1), so choose on price, context window or the category you care about most.
Is GPT-5.5 Instant or Solar Pro4 better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 40.1 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.