# Upstage: Solar Mini 4

Provider: upstage  
Category: llm  
Model ID: `upstage/solar-mini4`

Solar Mini 4 is Upstage's compact, cost-efficient language model, a 35B-parameter mixture-of-experts with 3B active parameters and a 524K context window. It is built for agentic use cases where response...

## Specs

- Context length: 524288 tokens
- Max output: 131072 tokens
- Modalities: text
- Released: 2026-09-23

## Pricing

- Input: $0.05 per million tokens
- Output: $0.20 per million tokens

## Providers

- **upstage** — ctx 524288, input $0.05/M, output $0.20/M

## Verdict

Solar Mini 4 delivers a 512K context window at budget pricing — $0.05 input makes it one of the cheapest long-context models available. Performance benchmarks aren't public yet, so you're trading proven capability data for cost savings and massive context capacity. Reach for this when you need to process entire codebases or multi-document corpora without breaking the bank, and you can validate output quality yourself.

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Last verified: 2026-10-19T02:30:34.239Z  
Canonical URL: https://switchy.build/directory/models/solar-mini4