Model comparison
GPT-5.4 nano vs Solar Pro4
GPT-5.4 nano and Solar Pro4 score almost the same on the Noometry Index (41.9 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-5.4 nano scores higher in 3 categories and Solar Pro4 in 5 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Solar Pro4 leads 28.5 to 23.7.
- GPT-5.4 nano is cheaper at $0.20 / $1.25 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Solar Pro4 accepts more context: 524K tokens versus 400K.
Side by side
| GPT-5.4 nano | Solar Pro4 | |
|---|---|---|
| Provider | OpenAI | Upstage |
| Noometry Index | 41.9 | 42.1 |
| Released | 2026-03-17 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 524K |
| Max output | 128K | 131K |
| Input $ / M tokens | $0.20 | $0.30 |
| Output $ / M tokens | $1.25 | $1.20 |
| Results tracked | 40 | 18 |
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Category by category
Coding GPT-5.4 nano leads
GPT-5.4 nano: 43.6 (#84), Solar Pro4: 40.1 (#149)
| Benchmark | GPT-5.4 nano | Solar Pro4 |
|---|---|---|
| LMArena Coding | 1405 | 1437 |
| LMArena WebDev | — | 1371 |
| SciCode | 46.9% | — |
| WeirdML | 49.2% | — |
| ALE-Bench | 1,005 | — |
Reasoning Solar Pro4 leads
GPT-5.4 nano: 23.7 (#173), Solar Pro4: 28.5 (#104)
| Benchmark | GPT-5.4 nano | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1381 | 1399 |
| ARC-AGI-2 | 5.7% | — |
| Kagi LLM Benchmark | 39.7% | — |
| ARC-AGI-1 | 51.5% | — |
| CritPt | 9.3% | — |
| Chess Puzzles | 30% | — |
| Mystery Game Puzzles | 9% | — |
| DTBench | 80.3% | — |
| LMCA | 36.9% | — |
| Epoch Capabilities Index | 145.81 | — |
| ForecastBench | 57.3 | — |
Math GPT-5.4 nano leads
GPT-5.4 nano: 40.9 (#88), Solar Pro4: 38.8 (#128)
| Benchmark | GPT-5.4 nano | Solar Pro4 |
|---|---|---|
| LMArena Math | 1406 | 1416 |
| FrontierMath (Tiers 1-3) | 44.9% | — |
| FrontierMath Tier 4 | 12.2% | — |
| OTIS Mock AIME 2024-2025 | 87.8% | — |
| ProofBench | 5% | — |
| FrontierMath (Feb 2025 set) | 25.9% | — |
| FrontierMath Tier 4 (v1) | 6.3% | — |
Knowledge GPT-5.4 nano leads
GPT-5.4 nano: 41.9 (#103), Solar Pro4: 39.8 (#129)
| Benchmark | GPT-5.4 nano | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1396 | 1427 |
| GPQA Diamond | 78.5% | — |
| SimpleQA Verified | 11.7% | — |
| Vectara Hallucination Rate | 3.1% | — |
Multimodal Not comparable
GPT-5.4 nano: 36.7 (#78), Solar Pro4: —
| Benchmark | GPT-5.4 nano | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1196 | — |
Multilingual Too close to call
GPT-5.4 nano: 48.6 (#140), Solar Pro4: 48.7 (#139)
| Benchmark | GPT-5.4 nano | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1359 | 1361 |
| LMArena Chinese | 1392 | 1415 |
| LMArena French | 1396 | 1397 |
| LMArena German | 1367 | 1364 |
| LMArena Japanese | 1343 | 1309 |
| LMArena Korean | 1320 | 1382 |
| LMArena Russian | 1363 | 1360 |
| LMArena Spanish | 1371 | 1401 |
Instruction Following Too close to call
GPT-5.4 nano: 71.9 (#144), Solar Pro4: 72.7 (#132)
| Benchmark | GPT-5.4 nano | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1362 | 1377 |
Long Context Too close to call
GPT-5.4 nano: 41.6 (#137), Solar Pro4: 42.1 (#130)
| Benchmark | GPT-5.4 nano | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1366 | 1381 |
Writing & Preference Too close to call
GPT-5.4 nano: 55.7 (#142), Solar Pro4: 56.5 (#138)
| Benchmark | GPT-5.4 nano | Solar Pro4 |
|---|---|---|
| LMArena Text | 1372 | 1386 |
| LMArena Creative Writing | 1314 | 1316 |
| LMArena Multi-Turn | 1382 | 1385 |
Frequently asked questions
Is GPT-5.4 nano better than Solar Pro4?
GPT-5.4 nano and Solar Pro4 score almost the same on the Noometry Index (41.9 vs 42.1), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.4 nano or Solar Pro4?
GPT-5.4 nano is cheaper. It lists at $0.20 per million input tokens and $1.25 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.
Is GPT-5.4 nano or Solar Pro4 better for coding?
GPT-5.4 nano scores higher on coding benchmarks: 43.6 versus 40.1 in the Noometry coding category.
Which has the bigger context window?
Solar Pro4 does, with 524K tokens against 400K.
How many benchmarks do GPT-5.4 nano and Solar Pro4 share?
17 benchmarks have published results for both models. GPT-5.4 nano has 40 scored results on Noometry and Solar Pro4 has 18.