Upstage · Released Feb 5, 2026
Solar Open2 250B
Upstage's 250B parameter open-weights model featuring Depth-Up Scaling (DUS) and strong multilingual reasoning.
OpenRating Index
37.4
0–100 composite
Reasoning Index
54.0
0–100 composite
Cost / Task
$0.19
benchmark run
Output speed
94 tok/s
blended tok/s
Time to first token
0.6s
median latency
Input price
$0.14
per 1M tokens
Output price
$0.56
per 1M tokens
Context window
128K
tokens
Strengths
Depth-Up Scaling architecture for parameter efficiency
Bilingual Korean/English and multilingual performance
Open weights for custom fine-tuning pipelines
How we rate Solar Open2 250B
OpenRating scores every model on the same axes. The OpenRating Index is a weighted composite of reasoning, knowledge, and agentic benchmarks, normalised to a 0–100 scale. Speed is blended output measured in tokens per second under standardised load, with time-to-first-token reported separately. Prices are list input and output prices per million tokens, and Task Cost measures end-to-end workload spending.
OpenRating Index
37.4
Reasoning Index
54.0
Token Pricing
Input per 1M tokens
$0.14
Output per 1M tokens
$0.56
Cost of 1M input + 1M output
$0.7
Task Cost Economics
Empirical cost breakdown for a standard OpenRating Index benchmark task ($0.19 total).
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