Ko-Arena-Hard v2 (Upstage)
Solar Open 100B 79.9% Fading Models answer hard user prompts in Korean, judged against a baseline in the style of Arena-Hard v2. Upstage built it in house.
Upstage marks it as in-house on the Solar Open 100B card and reports it again for the March 2026 Solar Pro 3 update. Its Korean prompt source is not published.
- Level
- Everyday Most adults, without training
- Scored
- Graded by a model A language model scores each response, usually against a rubric.
- Answers
- Open-ended Free-form text, documents, designs or media judged as a whole.
Solar Open 100B leads with 79.9%
Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.
- 1 Solar Open 100B 79.9%
- 2 Solar Pro 3 (March 2026 update) 78.2%
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Solar Open 100B | 79.9% | Jan 2026 | Model card | |
| 2 | Solar Pro 3 (March 2026 update) | 78.2% | Mar 2026 | Model card |
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Labs headline it less often now, last in Mar 2026
Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.
| Date | Launch post | Score | As the post writes it |
|---|---|---|---|
| 24 Mar 2026 | Solar Pro 3 (March 2026 update) | 78.2 | Ko-Arena-hard-v2 |
One system card reports it
Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.
| Date | Document | Score | As the document writes it | Section |
|---|---|---|---|---|
| 11 Jan 2026 | Solar Open 100B technical report | 79.9 | Ko Arena Hard v2 (in-house) (Table 5) | Capabilities |
More in Multilingual
- MMMLU In use MMLU professionally translated into 14 languages. Multiple-choice accuracy. Claude Mythos Preview 92.7%
- WMT24++ In use English-to-55-language translation of WMT24 test data. Scored with automatic metrics such as MetricX or xCOMET.
K-EXAONE 90.5% - MMLU-ProX In use MMLU-Pro translated into up to 29 languages with expert review. Multiple-choice accuracy per language.
Qwen3.7-Max 87% - CLIcK In use Models answer 1,995 multiple-choice questions on Korean language and culture. Questions come from official Korean exams and textbooks in eleven categories. Solar Open 2 90.7%
- Global MMLU Lite 3.0 In use Models answer 400 human-translated MMLU questions per language in 23 languages. Version 3.0 adds Czech, Hungarian, Oriya, Slovak and Tajik and updates Italian. Accuracy.
Inkling 88.7% - MMMB In use Models answer multiple-choice questions about images in six languages across 15 categories. The set has about 12,000 questions. LFM2.5-VL-3B 83%