Solar Pro 4
Solar Pro 4 sits in the frontier tier, built for high-capability reasoning, tool use, and long-form output where capability outweighs cost. Available via Upstage. 524,288-token context. Efficient pricing.
Solar Pro 4 is a efficient AI model from Upstage. It costs $0.1500 per million input tokens and $0.6000 per million output tokens (blended $0.2850/M), with a 524,288-token context window.
RatesUSD per million tokens. Blend is 70% input, 30% output, our calculation.
0.0%over 4 days · hover to read
From OpenRouter's listing, read on 11 Nov 2026.
- Strong general reasoning
- Tool use & function calling
- Long-form writing
- Production-grade reliability
- Production assistants
- Long-document analysis
- Multi-step agent workflows
- Engineering copilots
Benchmarks
More from Upstage
See all 3 →Price history
2 recorded changes| Date | Rate | Was | Now | Change |
|---|---|---|---|---|
| 8 Nov 2026 | Output | $0.1200 | $0.6000 | +400% |
| 8 Nov 2026 | Input | $0.0300 | $0.1500 | +400% |
Rates per million tokens, as published by the provider or its router listing. Tracking runs since 3 May; anything earlier is not on record. See every tracked price change.
Frequently asked questions
How much does Solar Pro 4 cost?
Solar Pro 4 costs $0.1500 per million input tokens and $0.6000 per million output tokens, for a blended reference rate of $0.2850 per million tokens.
What is Solar Pro 4's context window?
Solar Pro 4 supports up to 524,288 tokens of context in a single request.
What is Solar Pro 4 best for?
Solar Pro 4 is well suited to Strong general reasoning, Tool use & function calling and Long-form writing.
Who makes Solar Pro 4?
Solar Pro 4 is developed and served by Upstage.