Model comparison
Claude Sonnet 4 vs Solar Pro4
Solar Pro4 is the stronger model overall, scoring 42.1 to 40.8 on the Noometry Index.
Last verified . 17 shared benchmarks.
UpstageSummary
- They share 17 benchmarks with published results for both. Claude Sonnet 4 scores higher in 4 categories and Solar Pro4 in 4 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in long context, where Solar Pro4 leads 42.1 to 33.7.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.
- Solar Pro4 accepts more context: 524K tokens versus 200K.
Side by side
| Claude Sonnet 4 | Solar Pro4 | |
|---|---|---|
| Provider | Anthropic | Upstage |
| Noometry Index | 40.8 | 42.1 |
| Released | 2025-05-22 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 524K |
| Max output | 64K | 131K |
| Input $ / M tokens | $3 | $0.30 |
| Output $ / M tokens | $15 | $1.20 |
| Results tracked | 58 | 18 |
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Category by category
Coding Claude Sonnet 4 leads
Claude Sonnet 4: 43.5 (#88), Solar Pro4: 40.1 (#149)
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| LMArena Coding | 1414 | 1437 |
| SWE-bench Verified (bash only) | 64.9% | — |
| Aider Polyglot | 61.3% | — |
| LMArena WebDev | — | 1371 |
| SciCode | 40% | — |
| GSO | 4.9% | — |
| WeirdML | 46.1% | — |
| ALE-Bench | 655.35 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4: 38.5 (#31), Solar Pro4: —
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| TheAgentCompany | 33.1% | — |
| Cybench | 35% | — |
| DeepResearch Bench | 46.6% | — |
| OSWorld | 43.9% | — |
| METR Time Horizons | 62% | — |
Reasoning Solar Pro4 leads
Claude Sonnet 4: 22.9 (#187), Solar Pro4: 28.5 (#104)
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1372 | 1399 |
| ARC-AGI-2 | 5.9% | — |
| SimpleBench | 45.5% | — |
| Kagi LLM Benchmark | 73% | — |
| ARC-AGI-1 | 40% | — |
| CritPt | 0.3% | — |
| EnigmaEval | 3.1% | — |
| DTBench | 77.1% | — |
| LMCA | 29% | — |
| Epoch Capabilities Index | 141.69 | — |
| ForecastBench | 60.2 | — |
Math Claude Sonnet 4 leads
Claude Sonnet 4: 43.3 (#80), Solar Pro4: 38.8 (#128)
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| LMArena Math | 1375 | 1416 |
| OTIS Mock AIME 2024-2025 | 71.1% | — |
| Omni-MATH | 60.2% | — |
| MATH Level 5 | 84.4% | — |
| FrontierMath (Feb 2025 set) | 4.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Claude Sonnet 4 leads
Claude Sonnet 4: 41.8 (#108), Solar Pro4: 39.8 (#129)
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1372 | 1427 |
| GPQA Diamond | 79.2% | — |
| Humanity's Last Exam | 7.8% | — |
| MMLU-Pro | 84.3% | — |
| Confabulations | 13.2% | — |
| Vectara Hallucination Rate | 10.3% | — |
| GPQA (HELM) | 70.6% | — |
Multimodal Not comparable
Claude Sonnet 4: 26.2 (#121), Solar Pro4: —
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1191 | — |
| GeoBench | 37% | — |
| VPCT | 34% | — |
| MindCube | 44.8% | — |
Multilingual Solar Pro4 leads
Claude Sonnet 4: 46.7 (#156), Solar Pro4: 48.7 (#139)
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1333 | 1361 |
| LMArena Chinese | 1350 | 1415 |
| LMArena French | 1363 | 1397 |
| LMArena German | 1331 | 1364 |
| LMArena Japanese | 1302 | 1309 |
| LMArena Korean | 1291 | 1382 |
| LMArena Russian | 1355 | 1360 |
| LMArena Spanish | 1357 | 1401 |
Instruction Following Solar Pro4 leads
Claude Sonnet 4: 71.7 (#145), Solar Pro4: 72.7 (#132)
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1376 | 1377 |
| IFEval | 84% | — |
Long Context Solar Pro4 leads
Claude Sonnet 4: 33.7 (#259), Solar Pro4: 42.1 (#130)
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1398 | 1381 |
| Fiction.LiveBench | 46.9% | — |
Writing & Preference Too close to call
Claude Sonnet 4: 57.1 (#132), Solar Pro4: 56.5 (#138)
| Benchmark | Claude Sonnet 4 | Solar Pro4 |
|---|---|---|
| LMArena Text | 1351 | 1386 |
| LMArena Creative Writing | 1345 | 1316 |
| LMArena Multi-Turn | 1376 | 1385 |
| Short-Story Creative Writing | 81.4% | — |
| EQ-Bench Creative Writing | 1483 | — |
| WildBench | 83.8% | — |
Frequently asked questions
Is Claude Sonnet 4 better than Solar Pro4?
Solar Pro4 is the stronger model overall, scoring 42.1 to 40.8 on the Noometry Index.
Which is cheaper, Claude Sonnet 4 or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Claude Sonnet 4 lists at $3 and $15.
Is Claude Sonnet 4 or Solar Pro4 better for coding?
Claude Sonnet 4 scores higher on coding benchmarks: 43.5 versus 40.1 in the Noometry coding category.
Which has the bigger context window?
Solar Pro4 does, with 524K tokens against 200K.
How many benchmarks do Claude Sonnet 4 and Solar Pro4 share?
17 benchmarks have published results for both models. Claude Sonnet 4 has 58 scored results on Noometry and Solar Pro4 has 18.