As of: 2026-10-10 14:45 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/m/upstage-solar-mini-4/

# Solar Mini 4

Upstage, Solar 4 family. Status: current. Type: language model. Released: 2026-10-01. Training cutoff: not published.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenRouter | `upstage/solar-mini4` |  | https://openrouter.ai/upstage/solar-mini4 |

## Pricing

- Input: $0.05 per 1M tokens
- Cached input: $0.005 per 1M tokens
- Output: $0.20 per 1M tokens
- Unit as published: per 1M tokens (USD)
- Source: https://openrouter.ai/upstage/solar-mini4
- Last checked: 2026-10-10

## Specs

- Input: text
- Output: text
- Context window: 524,288 tokens
- Max output: 131,072 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- No published training cutoff. Counted from its release (2026-10-01): at least 221 AI events since (35 major, 10 historic), as of 2026-10-10.
- Everything since September 2026: https://postcutoff.com/since/2026-09/

## What stands out

- 3B-active MoE for high-volume agent work: 35B-parameter mixture-of-experts with ~3B active parameters and a 524K context; scores 24 on the Artificial Analysis Intelligence Index, among the best at its active size; runs on a single GPU after quantization (Upstage via Digital Today). Source: https://www.digitaltoday.co.kr/cn/view/109488/upstage-unveils-35-billion-parameter-sllm-solar-mini-4

## Notes

South Korea's Upstage announced Solar Mini 4 on Oct 1, 2026 (OpenRouter listing dated Sept 23). CEO Kim Seong-hun positions 'Pro' (Solar Pro 4, Aug 2026) for complex agent tasks and 'Mini' for large-scale business automation. Open-weight status not stated (no Hugging Face id on OpenRouter). Upstage console model id not verified.


Model page: https://postcutoff.com/m/upstage-solar-mini-4/