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Upstage: Solar Open2 250B

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solar-open2-250b

Solar Open2 250B is Upstage’s open-weights AI model, released Jun 28, 2026.

Context
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Input
— / 1M
Output
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Released
Jun 28, 2026
Modalities

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where Solar Open2 250B lands among all models tracked on Model Beat.

45.0
Intelligence Index
Artificial Analysis
45th percentile of tracked models
53.0
Coding Index
Artificial Analysis
53rd percentile of tracked models

Reasoning

2 evals
GPQA Diamond85.7%

Graduate-level scientific reasoning

Humanity's Last Exam28.5%

Frontier of human expert knowledge

Coding

1 evals
SciCode48.0%

Scientific research coding

Compare Solar Open2 250B with

Solar Open2 250B vs GPT-6 AstraSolar Open2 250B vs Claude Opus 5.5Solar Open2 250B vs Gemini 3.8 FlashSolar Open2 250B vs Kimi K3Solar Open2 250B vs Grok 4.6

Frequently asked questions

What is Solar Open2 250B?

Solar Open2 250B is an AI model, from Upstage, released Jun 28, 2026.

Who created Solar Open2 250B?

Solar Open2 250B is an AI model developed by Upstage, released Jun 28, 2026.

How does Solar Open2 250B perform on benchmarks?

On standardized evaluations tracked by Epoch AI, Solar Open2 250B scores 48.0% on SciCode, 28.5% on Humanity's Last Exam, 85.7% on GPQA Diamond.

Is Solar Open2 250B open source?

Solar Open2 250B is released with open weights (Open weights (unrestricted)), so the model can be downloaded and self-hosted.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Nov 12, 2026.