---
name: Solar Pro 4
slug: solar-pro-4
type: LLM
providers:
  - upstage
  - nano-gpt
  - openrouter
description: >-
  Upstage's Solar Pro 4 is a long-context language model for agentic workflows,
  office productivity, document-intensive work, and coding. This variant keeps
  reasoning disabled for faster direct responses.
tags:
  - solar
  - reasoning
  - solar-pro
  - llm
  - tool-use
is_open_source: false
context_window: 524288
max_output: 131072
pricing:
  - image: 0
    input: 0.03
    output: 0.12
    provider: nano-gpt
  - image: 0
    input: 0.03
    output: 0.12
    provider: openrouter
  - image: 0
    input: 0.3
    output: 1.2
    provider: upstage
release_date: '2026-08-11'
capabilities:
  audio: false
  vision: false
  tool_use: true
  citations: false
  reasoning: true
---
Solar Pro 4 is a LLM model.
Upstage's Solar Pro 4 is a long-context language model for agentic workflows, office productivity, document-intensive work, and coding. This variant keeps reasoning disabled for faster direct responses.