Solar Mini 4

by upstage · family solar

Facts

Release date	2026-09-23
Retired date	—
Knowledge cutoff	—
Context (max)	524,288
Max output	—
Modalities	text → text
Aliases	`solar-mini4`
Open weights	no
Description	Upstage's compact Solar tier (Sep 23, 2026): 35B total / 3B-active MoE with the Pro 4 generation's 524K context window, built for latency-sensitive agentic use at $0.05/$0.20 per Mtok on OpenRouter.

Unknown values are shown as —.

Offerings

Provider	Wire ID	Variant	Endpoint	Protocol	Status	Price (USD / Mtok)	Reasoning
OpenRouter	`upstage/solar-mini4`		chat-completions	openai-chat	ga	0.05 / 0.20	adaptive · default on · returns reasoning_content

Reasoning controls

OpenRouter· upstage/solar-mini4· chat-completions adaptive

adaptive · default on · returns reasoning_content

Example requests

OpenRouter · openai-chat · upstage/solar-mini4

curl 'https://openrouter.ai/api/v1/chat/completions' \
  -H 'Authorization: Bearer <YOUR_API_KEY>' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "upstage/solar-mini4",
  "messages": [
    {
      "role": "user",
      "content": "Tell me about the weather."
    }
  ]
}'

Python (requests)

import requests

resp = requests.post(
    "https://openrouter.ai/api/v1/chat/completions",
    headers={
      "Authorization": "Bearer <YOUR_API_KEY>",
      "Content-Type": "application/json"
    },
    json={
      "model": "upstage/solar-mini4",
      "messages": [
        {
          "role": "user",
          "content": "Tell me about the weather."
        }
      ]
    },
)
print(resp.json())

TypeScript (fetch)

const resp = await fetch("https://openrouter.ai/api/v1/chat/completions", {
  method: "POST",
  headers: {
    "Authorization": "Bearer <YOUR_API_KEY>",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "model": "upstage/solar-mini4",
    "messages": [
      {
        "role": "user",
        "content": "Tell me about the weather."
      }
    ]
  }),
})
console.log(await resp.json())