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Upstage: Solar Open 100B

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solar-open-100b

Solar Open 100B is Upstage’s open-weights AI model, released Dec 31, 2025.

Context
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Input
— / 1M
Output
— / 1M
Released
Dec 31, 2025
Modalities

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where Solar Open 100B lands among all models tracked on Model Beat.

10.0
Intelligence Index
Artificial Analysis
10th percentile of tracked models
5.0
Coding Index
Artificial Analysis
5th percentile of tracked models
16.0
Agentic Index
Artificial Analysis
16th percentile of tracked models

Reasoning

2 evals
GPQA Diamond65.7%

Graduate-level scientific reasoning

Humanity's Last Exam10.4%

Frontier of human expert knowledge

Coding

1 evals
SciCode26.9%

Scientific research coding

Agentic & Tools

1 evals
τ²-bench48.2%

Tool-agent-user reliability

Changelog

1
  • Solar Open 100B: Humanity's Last Exam improved from 9.2% to 10.4% (+13%)benchmark · Aug 6, 2026

Compare Solar Open 100B with

Solar Open 100B vs GPT-6 AstraSolar Open 100B vs Claude Fable 5Solar Open 100B vs Kimi K3Solar Open 100B vs Grok 4.6Solar Open 100B vs DeepSeek-V4-Pro-0813

Frequently asked questions

What is Solar Open 100B?

Solar Open 100B is an AI model, from Upstage, released Dec 31, 2025.

Who created Solar Open 100B?

Solar Open 100B is an AI model developed by Upstage, released Dec 31, 2025.

How does Solar Open 100B perform on benchmarks?

On standardized evaluations tracked by Epoch AI, Solar Open 100B scores 48.2% on τ²-bench, 10.4% on Humanity's Last Exam, 26.9% on SciCode.

Is Solar Open 100B open source?

Solar Open 100B is released with open weights (Open weights (restricted use)), 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 Sep 17, 2026.