Introduction

What is Solar Pro 4?

Solar Pro 4 is an agentic AI model built to carry real work to the finish. It reads long documents, runs terminal tasks, chains multi-turn tool calls, and stops to say so when the evidence runs out.

Core capabilities

• 512K context with up to 128K output tokens — load several contracts, reports, and data files into a single session.
• Reasoning by default — the response carries the reasoning trace, with reasoning effort adjustable from real-time interaction to deep analysis.
• English, Korean, and Japanese for both input and output.
• OpenAI-compatible endpoint — swap the endpoint and the model name (solar-pro4) to migrate.

Using the service

Sign in with Google, check your credits, and start a chat from the home page. Accounts start with free credits, and plans can be topped up from the pricing page.

Pricing

• Input: $0.30 per 1M tokens
• Cached input: $0.06 per 1M tokens
• Output: $1.20 per 1M tokens

Agent work never costs one call — a higher completion rate and fewer bad tool calls mean fewer failed runs you pay for twice.