Ko-AIME 2025 (Upstage)

Solar Open 2 97.7% leads since July 2026

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Models solve AIME 2025 competition problems in Korean. Upstage built the set in house.

The technical report lists it only as an in-house Korean math benchmark. The Korean framing is read from its name.

Made by: Upstage
Released: July 2026
Kind: Competition problems with answers
Level: Competition
Scored: Checked automatically
Answers: Short answer
Tasks: Kept private

Last in a launch post: July 2026, dropped after it saturated
Last model added: July 2026

Paper arxiv.org

Models scored in lab cards

Launch posts list it, from 1 lab

System cards report it, from 1 lab

Solar Open 2 leads with 97.7%

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.

Bars Table

1 Solar Open 2 97.7%
2 Solar Open 100B 80%

Source: Labs’ model cards

#	Model	Score	Setting	Date	Source
1	Solar Open 2	97.7%		Jul 2026	Lab model card
2	Solar Open 100B	80%		Dec 2025	Lab model card

2 models have held number one in labs’ own numbers since its release in July 2026

Lab claims count from the day the card came out, independent runs from the model’s release.

Upstage

Lab claims Passed 85% in Jul 2026, by Solar Open 2

Solar Open 2 97.7%

Source: Labs’ model cards

Upstage’s own number for Solar Open 2 passed 85% in July 2026

All the scores we have, one dot each, so a model tested at several settings appears more than once.

Reported by the lab in its model card Best so far

Source: Labs’ model cards

Labs headline it less often now, last in July 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.

Upstage

Date	Launch post	Score	As the post writes it
Jul 22, 2026	Solar Open 2	97.7	Ko-AIME’25 (in-house)
Dec 31, 2025	Solar Open 100B	80	Ko-AIME 2025 (in-house)

2 system cards report it, from 1 lab

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
Jul 22, 2026	Solar Open 2 technical report	97.7	Ko-AIME'25, in-house (Table 4)	Capabilities
Jan 11, 2026	Solar Open 100B technical report	80	Ko-AIME 2025 (in-house) (Table 5)	Capabilities

Solar Open 2 leads with 97.7%

2 models have held number one in labs’ own numbers since its release in July 2026

Upstage’s own number for Solar Open 2 passed 85% in July 2026

Labs headline it less often now, last in July 2026

2 system cards report it, from 1 lab

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