OpenRouter

Upstage: Solar Mini 4

upstage/solar-mini-4
Context

512K

Input

text

Output

text

Tool calling

Supported

About this model

Solar Mini 4 is Upstage's lightweight Mixture-of-Experts language model built for fast, economical agentic workloads. With 35B total parameters and only 3B activated per token, it delivers efficient inference while supporting a 512K-token context window for large documents and long-running workflows. The model combines fluent Korean understanding with strong English and Japanese capabilities and supports reasoning, tool calling, structured outputs, and long-context processing. Solar Mini 4 is particularly suited to high-volume agents, routing, classification, document analysis, and applications where latency and serving cost are important.

Input modalities

text

Accepted as model input

Providers

Available routing options for this model through OneInfer.

Available

Input tokens

$0.050 / 1M tokens

Output tokens

$0.200 / 1M tokens

Routing

OneInfer optimized

Pricing

Current OneInfer pricing for this model.

UsagePrice
Input tokens$0.050 / 1M tokens
Output tokens$0.200 / 1M tokens
Cached input tokens$0.0050 / 1M tokens

Performance & Benchmarks

Independent evaluations and live cluster operational metrics

We haven’t measured this model yet. Published academic results are under Academic Evaluations.

API Guide

API docs
  1. 1

    Generate your access token

    Use your API key to generate the JWT access token required by the Models API.

  2. 2

    Add the JWT token

    Copy the generated JWT token and replace JWT_TOKEN in the example below.

  3. 3

    Check your credits

    If your balance is too low, before calling the model.

  4. 4

    Run the API example

    Choose your preferred language, copy the example, and send your first model request.

    curl https://api.oneinfer.ai/v1/ula/chat/completions \
      -H "Authorization: Bearer $JWT_TOKEN" \
      -H "Content-Type: application/json" \
      -d '{
        "model": "upstage/solar-mini-4",
        "messages": [
          { "role": "user", "content": "Hello!" }
        ]
      }'

Community Model Reviews & Ratings

Verified visitor & developer evaluations on Upstage: Solar Mini 4's real-world intelligence, code accuracy, and speed

4.8
Community consensus rating
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