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Step 5 Preview
Solar Pro 4
Solar Pro 4 is a proprietary model from Upstage, released Aug 10, 2026. It ranks #171 of 351 on the LMArena text leaderboard with a rating of 1388. It costs $0.15 per million input tokens and $0.60 per million output tokens, with a 512K-token context window.
- Developer
- Upstage
- Released
- Aug 10, 2026
- Context window
- 512K
- Price in / out, per 1M tokens
- $0.15 / $0.60
- Weights
- Proprietary
- Inputs
- Text
- Reasoning
- Yes
- Tool use
- Yes
The rating LMArena published at each update since Aug 11, 2026. Ratings move as votes come in and new models join.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1388 | 171 / 351 | 24.5K |
| CodingLMArena | 1437 | 125 / 346 | 6.3K |
| MathLMArena | 1417 | 130 / 339 | 1.2K |
| Creative writingLMArena | 1318 | 205 / 349 | 5.3K |
| Instruction followingLMArena | 1374 | 168 / 351 | 8.8K |
| Hard promptsLMArena | 1400 | 165 / 351 | 15.8K |
| Multi-turnLMArena | 1387 | 173 / 349 | 3.6K |
| Long queriesLMArena | 1382 | 173 / 330 | 11.2K |
| ExpertLMArena | 1428 | 122 / 305 | 2.8K |
| Legal and governmentIndustries | 1384 | 175 / 325 | 2K |
| Medicine and healthcareIndustries | 1374 | 186 / 325 | 1.6K |
| Business and financeIndustries | 1381 | 171 / 344 | 4.4K |
| ChineseLanguages | 1423 | 163 / 328 | 1.9K |
| SpanishLanguages | 1413 | 128 / 249 | 779 |
| GermanLanguages | 1357 | 163 / 261 | 401 |
| FrenchLanguages | 1403 | 154 / 252 | 782 |
| JapaneseLanguages | 1320 | 149 / 236 | 424 |
| WebDevLMArena | 1370 | 111 / 124 | 4.7K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Solar Pro 4
Upstage
Korea’s Upstage builds the Solar family of compact, capable models. Founded 2020, based in Seoul. upstage.ai
Questions
Who makes Solar Pro 4?
Solar Pro 4 is made by Upstage, founded 2020 and based in Seoul.
How much does Solar Pro 4 cost?
$0.15 per million input tokens and $0.60 per million output tokens, at its provider’s list price.
What is Solar Pro 4’s context window?
512K tokens (524,288).
How does Solar Pro 4 rank?
#171 of 351 on LMArena’s text leaderboard, rated 1388 (95% interval 1383–1393) from 24,453 votes, as of Oct 22, 2026.
Is Solar Pro 4 open source?
No. Solar Pro 4 is proprietary and served through its provider’s API.