Model comparison
GPT-5.5 Pro vs Solar Pro4
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.5 on the Noometry Index. Solar Pro4 costs 129× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
UpstageSummary
- The widest gap is in math, where GPT-5.5 Pro leads 83.8 to 36.1.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 524K.
Side by side
| GPT-5.5 Pro | Solar Pro4 | |
|---|---|---|
| Provider | OpenAI | Upstage |
| Noometry Index | 64.3 | 41.5 |
| Released | 2026-04-23 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 524K |
| Max output | 128K | 131K |
| Input $ / M tokens | $30 | $0.30 |
| Output $ / M tokens | $180 | $1.20 |
| Results tracked | 14 | 18 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Solar Pro4: 39.9 (#135)
| Benchmark | GPT-5.5 Pro | Solar Pro4 |
|---|---|---|
| LMArena WebDev | — | 1371 |
| LMArena Coding | — | 1439 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.6 (#7), Solar Pro4: 27.3 (#107)
| Benchmark | GPT-5.5 Pro | Solar Pro4 |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1398 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.45 | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 83.8 (#8), Solar Pro4: 36.1 (#129)
| Benchmark | GPT-5.5 Pro | Solar Pro4 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| LMArena Math | — | 1418 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.2 (#17), Solar Pro4: 39.0 (#128)
| Benchmark | GPT-5.5 Pro | Solar Pro4 |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1421 |
Multilingual Not comparable
GPT-5.5 Pro: —, Solar Pro4: 49.0 (#134)
| Benchmark | GPT-5.5 Pro | Solar Pro4 |
|---|---|---|
| LMArena Non-English | — | 1362 |
| LMArena Chinese | — | 1417 |
| LMArena French | — | 1403 |
| LMArena German | — | 1351 |
| LMArena Japanese | — | 1300 |
| LMArena Korean | — | 1383 |
| LMArena Russian | — | 1360 |
| LMArena Spanish | — | 1408 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Solar Pro4: 72.8 (#128)
| Benchmark | GPT-5.5 Pro | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | — | 1376 |
Long Context Not comparable
GPT-5.5 Pro: —, Solar Pro4: 42.0 (#125)
| Benchmark | GPT-5.5 Pro | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | — | 1379 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Solar Pro4: 56.7 (#133)
| Benchmark | GPT-5.5 Pro | Solar Pro4 |
|---|---|---|
| LMArena Text | — | 1386 |
| LMArena Creative Writing | — | 1313 |
| LMArena Multi-Turn | — | 1391 |
Frequently asked questions
Is GPT-5.5 Pro better than Solar Pro4?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.5 on the Noometry Index. Solar Pro4 costs 129× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 Pro or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 524K.
How many benchmarks do GPT-5.5 Pro and Solar Pro4 share?
0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Solar Pro4 has 18.