---
title: "solar-pro4 - Model Details & Comparison"
description: "solar-pro4 from OpenRouter: capabilities, context limits, pricing, and side-by-side comparisons with alternative models."
url: "https://www.getmaxim.ai/bifrost/model-library/compare/openrouter/solar-pro4"
markdown: "https://www.getmaxim.ai/bifrost/model-library/compare/openrouter/solar-pro4.md"
---

# solar-pro4 - Model Details & Comparison

> solar-pro4 from OpenRouter: capabilities, context limits, pricing, and side-by-side comparisons with alternative models.

## Important Links

- [View MCP Gateway](https://www.getmaxim.ai/bifrost/resources/mcp-gateway.md)
- [Features](https://www.getmaxim.ai/bifrost/#features)
- [Enterprise](https://www.getmaxim.ai/enterprise)
- [Pricing](https://www.getmaxim.ai/pricing)
- [Docs](https://docs.getbifrost.ai)
- [GitHub](https://github.com/maximhq/bifrost)
- [Book a Demo](https://www.getmaxim.ai/book-a-demo)

## About solar-pro4

solar-pro4 is a chat model from OpenRouter, one of 468 chat models they offer. It is priced at $0.09 per 1M input tokens and $0.36 per 1M output tokens, ranking 383 out of 3648 chat models by cost and cheaper than 89% of models in this category. solar-pro4 supports function calling, reasoning, prompt caching, structured output. Its 524K-token context window is in the top 24% among chat models.

## Specifications

- **OpenRouter Provider.**
- **Chat Mode.**
- **524,288 Max Input Tokens.**
- **131,072 Max Output Tokens.**
- **131,072 Max Tokens.**
- **$0.09 / 1M tokens Input Price.**
- **$0.36 / 1M tokens Output Price.**

## Capabilities

solar-pro4 supports: Function Calling, Reasoning, Prompt Caching, Response Schema, Tool Choice.

## solar-pro4 Pricing Overview

At $0.09 per 1M input tokens and $0.36 per 1M output tokens, solar-pro4 ranks 383 out of 3648 chat models by input cost. It is more affordable compared to the median of $0.57 for chat models, and is cheaper than 89% of models in this category.

solar-pro4 is one of 468 OpenRouter chat models, with support for function calling, reasoning, prompt caching, structured output. its 524K-token context window places it in the top 24% of chat models.

## Models to Compare

Alternatives to solar-pro4 with comparable capabilities.

| Model | Provider | Input $/1M | Output $/1M |
| --- | --- | --- | --- |
| gemini-2.5-flash-lite | Vertex AI | $0.10 | $0.40 |
| gemini-2.5-flash-lite-preview-09-2025 | Vertex AI | $0.10 | $0.40 |
| gemini-2.5-flash-lite-preview-06-17 | Vertex AI | $0.10 | $0.40 |
| gemini-2.5-flash-lite | Google Gemini | $0.10 | $0.40 |
| gemini-2.5-flash-lite-preview-09-2025 | Google Gemini | $0.10 | $0.40 |

- [Compare gemini-2.5-flash-lite](https://www.getmaxim.ai/bifrost/model-library/compare/vertex_ai/gemini-2.5-flash-lite.md)
- [Compare gemini-2.5-flash-lite-preview-09-2025](https://www.getmaxim.ai/bifrost/model-library/compare/vertex_ai/gemini-2.5-flash-lite-preview-09-2025.md)
- [Compare gemini-2.5-flash-lite-preview-06-17](https://www.getmaxim.ai/bifrost/model-library/compare/vertex_ai/gemini-2.5-flash-lite-preview-06-17.md)
- [Compare gemini-2.5-flash-lite](https://www.getmaxim.ai/bifrost/model-library/compare/gemini/gemini-2.5-flash-lite.md)
- [Compare gemini-2.5-flash-lite-preview-09-2025](https://www.getmaxim.ai/bifrost/model-library/compare/gemini/gemini-2.5-flash-lite-preview-09-2025.md)

## Related Resources

- [Calculate solar-pro4 costs](https://www.getmaxim.ai/bifrost/llm-cost-calculator/provider/openrouter/model/solar-pro4.md)
- [Check OpenRouter status](https://www.getmaxim.ai/bifrost/provider-status/openrouter.md)
- [All OpenRouter pricing](https://www.getmaxim.ai/bifrost/llm-cost-calculator/provider/openrouter.md)

## FAQ

### Is solar-pro4 cheaper than gemini-2.5-flash-lite?

Yes. solar-pro4 costs $0.09 per 1M input tokens compared to gemini-2.5-flash-lite's $0.10 per 1M input tokens, making it 11% more affordable. Both are chat models and share support for vision, function calling, reasoning, web search, prompt caching, structured output.

### How does solar-pro4 pricing compare to the average chat model?

solar-pro4 input pricing is $0.09 per 1M tokens, which is 84% below the median of $0.57 for chat models. It ranks 383 out of 3648 chat models by input cost, making it cheaper than 89% of models in this category. For output, it costs $0.36 per 1M tokens compared to the median of $1.65.

### What makes solar-pro4 different from other OpenRouter models?

Among OpenRouter's 468 chat models, solar-pro4 ranks 65 by input cost.

### What are the best alternatives to solar-pro4?

The most comparable chat models to solar-pro4 are: gemini-2.5-flash-lite from Vertex AI ($0.10/1M input tokens); gemini-2.5-flash-lite-preview-09-2025 from Vertex AI ($0.10/1M input tokens); gemini-2.5-flash-lite-preview-06-17 from Vertex AI ($0.10/1M input tokens); gemini-2.5-flash-lite from Google Gemini ($0.10/1M input tokens). These alternatives were selected based on similar capabilities, pricing, and provider diversity. You can compare any of these models in detail using the Bifrost Model Library.

### How large is solar-pro4's context window?

solar-pro4 supports up to 524,288 input tokens, placing it in the top 24% of chat models by context window size (rank 854 of 3577). This makes it suitable for processing long documents, extensive code repositories, or maintaining detailed conversation histories.

### How do I check if OpenRouter is down?

You can monitor OpenRouter service health in real time on the Bifrost OpenRouter Status page. It tracks current component status, active incidents, and historical reliability data pulled from the official status page every 60 seconds.

### How do I calculate solar-pro4 costs?

solar-pro4 is priced based on input and output tokens. Use the interactive calculator at the top of this page to estimate costs for your specific workload. Enter your expected input and output tokens volume and the calculator will show the total cost breakdown. For reference, processing 1M input tokens costs $0.09 and generating 1M output tokens costs $0.36.

## Related Resources

- [OpenRouter models](https://www.getmaxim.ai/bifrost/model-library/provider/openrouter.md)
- [Model library](https://www.getmaxim.ai/bifrost/model-library.md)
- [LLM cost calculator](https://www.getmaxim.ai/bifrost/llm-cost-calculator.md)
- [Docs: Bifrost docs](https://docs.getbifrost.ai)
- [GitHub: maximhq/bifrost](https://github.com/maximhq/bifrost)
- [Pricing: Bifrost pricing](https://www.getmaxim.ai/pricing)
- [Enterprise: Bifrost enterprise](https://www.getmaxim.ai/enterprise)
- [Book a Demo: Bifrost demo](https://www.getmaxim.ai/book-a-demo)
- [Resources: Bifrost resources](https://www.getmaxim.ai/bifrost/resources.md)

---

*This is a markdown version of [https://www.getmaxim.ai/bifrost/model-library/compare/openrouter/solar-pro4](https://www.getmaxim.ai/bifrost/model-library/compare/openrouter/solar-pro4) for AI/LLM consumption.*