Solar Open 100B

Solar Open 100B places in the top three on KMMLU.

Upstage Released 31 Dec 2025 Family Solar Open The lab's model card

Benchmarks with a score

Ranked first, out of five or more models

In the top three

Upstage Dec 2025

Open weights Mid-size

No Epoch Capabilities Index score yet

Where it ranks

Its best score on each benchmark, and where that ranks among every model with a score there. We rank each model once, at its best setting.

Benchmark	Score	Rank	Source
MMLU	88.2%	#27 of 127	Model card
Arena-Hard v2.0	74.8%	#7 of 24	Model card
KMMLU	73%	#2 of 6	Model card
IFEval	88%	#47 of 126	Model card
MMLU-Pro	80.4%	#75 of 151	Model card
Ko-Arena-Hard v2 (Upstage)	79.9%	#1 of 2	Model card
IFBench	53.7%	#57 of 70	Model card
WritingBench	7.51	#12 of 14	Model card
Humanity's Last Exam	10.5%	#134 of 147	Model card
AA-LCR (Artificial Analysis Long Context Reasoning)	35%	#31 of 31	Model card
KMMLU-Pro	64%	#7 of 7	Model card
CLIcK	78.9%	#4 of 4	Model card
HAE-RAE Bench	73.3%	#3 of 3	Model card
KoBALT	44.3%	#3 of 3	Model card
Ko-IFEval (Upstage)	87.5%	#1 of 1	Model card

Benchmark	Score	Rank	Source
AIME 2024	91.7%	#12 of 87	Model card
AIME 2025	84.3%	#76 of 143	Model card
GPQA Diamond	68.1%	#180 of 284	Model card
HMMT 2025	73.3%	#40 of 49	Model card
HMMT Nov 2025	80%	#21 of 23	Model card
HRM8K	87.6%	#3 of 3	Model card
Ko-AIME 2025 (Upstage)	80%	#2 of 2	Model card
Ko-AIME 2024 (Upstage)	80.3%	#1 of 1	Model card

Benchmark	Score		Rank	Source
LiveCodeBench v6	74.2%		#42 of 76	Model card

Benchmark	Score		Rank	Source
tau2-bench	55.8%		#64 of 69	Model card

Benchmark	Score	Rank	Source
KBL	65.5%	#4 of 4	Model card
KorMedMCQA	84.4%	#4 of 4	Model card
KBank-MMLU (Upstage)	65.5%	#3 of 3	Model card

The benchmarks the lab chose to headline, with the scores it gave.

Every result in the longer documents the lab published with it. 3 of them aren't in the launch post.