---
title: "aion-3.5-mini - Model Details & Comparison"
description: "aion-3.5-mini from OpenRouter: capabilities, context limits, pricing, and side-by-side comparisons with alternative models."
url: "https://www.getmaxim.ai/bifrost/model-library/compare/openrouter/aion-3.5-mini"
markdown: "https://www.getmaxim.ai/bifrost/model-library/compare/openrouter/aion-3.5-mini.md"
---

# aion-3.5-mini - Model Details & Comparison

> aion-3.5-mini from OpenRouter: capabilities, context limits, pricing, and side-by-side comparisons with alternative models.

## Important Links

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

## About aion-3.5-mini

aion-3.5-mini is a chat model from OpenRouter, one of 491 chat models they offer. It is priced at $0.70 per 1M input tokens and $1.40 per 1M output tokens, ranking 2181 out of 4042 chat models by cost and cheaper than 46% of models in this category. aion-3.5-mini supports function calling, reasoning, prompt caching, structured output. Its 262K-token context window is in the top 46% among chat models.

## Specifications

- **OpenRouter Provider.**
- **Chat Mode.**
- **262,144 Max Input Tokens.**
- **32,768 Max Output Tokens.**
- **32,768 Max Tokens.**
- **$0.70 / 1M tokens Input Price.**
- **$1.40 / 1M tokens Output Price.**

## Capabilities

aion-3.5-mini supports: Function Calling, Reasoning, Prompt Caching, Response Schema, Tool Choice.

## aion-3.5-mini Pricing Overview

At $0.70 per 1M input tokens and $1.40 per 1M output tokens, aion-3.5-mini ranks 2181 out of 4042 chat models by input cost. It is more expensive compared to the median of $0.60 for chat models, and is cheaper than 46% of models in this category.

aion-3.5-mini is one of 491 OpenRouter chat models, with support for function calling, reasoning, prompt caching, structured output. its 262K-token context window places it in the top 46% of chat models.

## Models to Compare

Alternatives to aion-3.5-mini with comparable capabilities.

| Model | Provider | Input $/1M | Output $/1M |
| --- | --- | --- | --- |
| gpt-5.4-mini | Azure | $0.75 | $4.50 |
| gpt-5.4-mini-2026-03-17 | Azure | $0.75 | $4.50 |
| gemini-3.6-flash | Vertex AI | $0.75 | $3.75 |
| gemini-3.7-flash | Vertex AI | $0.75 | $3.75 |
| gemini-3.8-flash | Vertex AI | $0.75 | $3.75 |

- [Compare gpt-5.4-mini](https://www.getmaxim.ai/bifrost/model-library/compare/azure/gpt-5.4-mini.md)
- [Compare gpt-5.4-mini-2026-03-17](https://www.getmaxim.ai/bifrost/model-library/compare/azure/gpt-5.4-mini-2026-03-17.md)
- [Compare gemini-3.6-flash](https://www.getmaxim.ai/bifrost/model-library/compare/vertex_ai/gemini-3.6-flash.md)
- [Compare gemini-3.7-flash](https://www.getmaxim.ai/bifrost/model-library/compare/vertex_ai/gemini-3.7-flash.md)
- [Compare gemini-3.8-flash](https://www.getmaxim.ai/bifrost/model-library/compare/vertex_ai/gemini-3.8-flash.md)

## Related Resources

- [Calculate aion-3.5-mini costs](https://www.getmaxim.ai/bifrost/llm-cost-calculator/provider/openrouter/model/aion-3.5-mini.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 aion-3.5-mini cheaper than gpt-5.4-mini?

Yes. aion-3.5-mini costs $0.70 per 1M input tokens compared to gpt-5.4-mini's $0.75 per 1M input tokens, making it 7% more affordable. Both are chat models and share support for vision, function calling, reasoning, web search, prompt caching, structured output.

### How does aion-3.5-mini pricing compare to the average chat model?

aion-3.5-mini input pricing is $0.70 per 1M tokens, which is 17% above the median of $0.60 for chat models. It ranks 2181 out of 4042 chat models by input cost, making it cheaper than 46% of models in this category. For output, it costs $1.40 per 1M tokens compared to the median of $1.80.

### What makes aion-3.5-mini different from other OpenRouter models?

Among OpenRouter's 491 chat models, aion-3.5-mini ranks 253 by input cost.

### What are the best alternatives to aion-3.5-mini?

The most comparable chat models to aion-3.5-mini are: gpt-5.4-mini from Azure ($0.75/1M input tokens); gpt-5.4-mini-2026-03-17 from Azure ($0.75/1M input tokens); gemini-3.6-flash from Vertex AI ($0.75/1M input tokens); gemini-3.7-flash from Vertex AI ($0.75/1M 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 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 aion-3.5-mini costs?

aion-3.5-mini 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 $0.70 and generating 1M output tokens costs $1.40.

## Related Resources

- [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.md)
- [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/resources.md)

---

*This is a markdown version of [https://www.getmaxim.ai/bifrost/model-library/compare/openrouter/aion-3.5-mini](https://www.getmaxim.ai/bifrost/model-library/compare/openrouter/aion-3.5-mini) for AI/LLM consumption.*