Solar LLMs
Upstage's family of agent-oriented language models -- Solar Pro 4 as a hosted API for terminal tasks, document workflows and multi-turn tool use, plus the open-weight Solar Open 2 (250B MoE, 15B active params) for self-hosting.
Find alternatives to Solar LLMs
Solar Pro 4 API billed per token via console.upstage.ai: $0.30/1M input, $0.06/1M cached input, $1.20/1M output (promotional pricing through Oct 2026, upstage.ai/pricing/api); Solar Open 2 is open-weight on Hugging Face at no charge for the weights.
What it does
- Text generation
- Code generation
- Model inference
- Agent orchestration
How it compares
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Z.ai Model API
84.4 on KorMedMCQA for medical domains (+3.9pp over GLM-4.5-Air, +8.6pp over gpt-oss-high)
Research report · 19 Sep 2026 -
Alibaba Cloud Model Studio
Solar Pro 2 delivered results comparable to leading frontier-scale models including OpenAI's GPT-4o, DeepSeek's R1, Mistral's Small 3.2, and Alibaba's Qwen 3—despite being less than half their size.
Official documentation · 19 Sep 2026 -
DeepSeek API Platform
Solar Pro 2 delivered results comparable to leading frontier-scale models including OpenAI's GPT-4o, DeepSeek's R1, Mistral's Small 3.2, and Alibaba's Qwen 3—despite being less than half their size.
Official documentation · 19 Sep 2026 -
Mistral AI Studio
Solar Pro 2 delivered results comparable to leading frontier-scale models including OpenAI's GPT-4o, DeepSeek's R1, Mistral's Small 3.2, and Alibaba's Qwen 3—despite being less than half their size.
Official documentation · 19 Sep 2026 -
OpenAI API
Solar Pro 2 delivered results comparable to leading frontier-scale models including OpenAI's GPT-4o, DeepSeek's R1, Mistral's Small 3.2, and Alibaba's Qwen 3—despite being less than half their size.
Official documentation · 19 Sep 2026
Sources
- Pricing
- Description
- Sold within
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Billed on its own via the API console, not bundled into another Upstage product.
- URL
- Deployment
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Upstage AI Space Application
Document intelligence tool that extracts, drafts and reviews document-based work; referenced in a customer testimonial as helping brokers find answers across long documents.
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Solar Chat Application
Research-the-web chat assistant built on Upstage's Solar LLM family, answering questions with sources.
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