aion-3-5-mini
Aion 3.5 Mini is the smaller, lower-cost sibling of Aion 3.5, AionLabs’ multi-model roleplaying and storytelling system built on the GLM family.
Pricing: Input 168 credits / 1M tokens (≈ $0.84), Output 336 credits / 1M tokens (≈ $1.68).
Prices updated
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Aion 3.5 Mini API on ModelFold
Aion 3.5 Mini is the smaller, lower-cost sibling of Aion 3.5, AionLabs’ multi-model roleplaying and storytelling system built on the GLM family. Try Aion 3.5 Mini in the ModelFold Playground, then call it from your own code through an OpenAI-compatible chat completions API.
What Is the Aion 3.5 Mini API
Aion 3.5 Mini at a glance
Aion 3.5 Mini is a chat model from AionLabs. It accepts text as input and returns text, with a context window of up to 262K tokens.
Use it without hosting anything
On ModelFold you call Aion 3.5 Mini with a single API key — no model weights to download and no inference servers to run. The same key also works for the other chat, image, video and audio models on ModelFold.
Core Capabilities of Aion 3.5 Mini
Up to 262K tokens of context
Keep long conversations, large documents and sizeable code in a single request, so the model can reason over the full material instead of fragments.
Function calling
Aion 3.5 Mini supports tool (function) calling: describe your functions in the request and the model returns structured calls your code can run — the basis for agents and integrations.
Adjustable reasoning effort
Choose a reasoning effort level (low, medium or high) per request to balance depth of thinking against speed and token usage.
Structured outputs
Ask for JSON that follows a schema (response_format), which makes extraction, classification and system integrations more reliable.
How to Use Aion 3.5 Mini on ModelFold
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Step 1: Try it in the Playground
Open the Playground at the top of this page, type a prompt and see how Aion 3.5 Mini responds before writing any code.
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Step 2: Create an API key
Sign in to ModelFold and create an API key in the console. Keep it secret and send it as a Bearer token.
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Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "aion-3-5-mini" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
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Step 4: Ship and monitor
Integrate the response into your product and check token usage and spend for every call in the console logs.
What You Can Build with Aion 3.5 Mini
Writing and content
Draft, edit and translate articles, emails, product copy and documentation in a consistent tone.
High-volume pipelines
Run classification, extraction, rewriting and batch jobs at scale where cost per request matters.
Frequently Asked Questions
What is Aion 3.5 Mini?⌄
Aion 3.5 Mini is the smaller, lower-cost sibling of Aion 3.5, AionLabs’ multi-model roleplaying and storytelling system built on the GLM family.
Which inputs does Aion 3.5 Mini support?⌄
Aion 3.5 Mini accepts text and returns text. Through ModelFold you send text messages; documents attached in the Playground are converted to text.
How long is the context window of Aion 3.5 Mini?⌄
Up to 262K tokens, shared between your input and the model’s output.
Does Aion 3.5 Mini support function calling?⌄
Yes. Aion 3.5 Mini supports tools / function calling through the standard tools parameter of the chat completions API.
How is Aion 3.5 Mini billed on ModelFold?⌄
Pay as you go by tokens: input and output tokens are charged at the per-million-token prices shown on this page. There is no monthly fee, and failed requests are not charged.
How do I call Aion 3.5 Mini through the API?⌄
Send a POST request to https://modelfold.ai/v1/chat/completions with "model": "aion-3-5-mini", using your ModelFold API key as the Bearer token.
| Input | 168 credits 1M tokens≈ $0.84 |
| Output | 336 credits 1M tokens≈ $1.68 |
Billed per token: input and output are priced separately, and thinking tokens count as output. The Playground charges exactly the same way.
Read API docs →AI Agents · Claude Code / Cursor / Trae →curl https://modelfold.ai/v1/chat/completions \
-H "Authorization: Bearer $MODELFOLD_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"aion-3-5-mini","messages":[{"role":"user","content":"Hello"}]}'