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Upstage · Language model

Solar Mini 4

upstage/solar-mini4
  • Language
Released Sep 23, 2026

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...

Specifications

Context window
524,288 tokens
Max output
131,072 tokens
Input
text
Output
text
Reasoning effort
max, xhigh, high, medium, low, minimal, none
Tokenizer
Other

Supported parameters

Accepted by the model and forwarded as-is by the gateway.

  • frequency_penalty
  • max_tokens
  • parallel_tool_calls
  • presence_penalty
  • reasoning
  • reasoning_effort
  • response_format
  • structured_outputs
  • temperature
  • tool_choice
  • tools
  • top_p

Use it

POST /api/v1/chat/completions · MCP chat · full reference

curl https://omnirail.org/api/v1/chat/completions \
  -H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
  -d '{"model":"upstage/solar-mini4","messages":[{"role":"user","content":"Hello"}],"max_tokens":300}'