aion-3-5
Aion 3.5 is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family, in which several specialized models collaborate on each response.
Precio: Entrada: 720 créditos / 1 M de tokens (≈ $3.60); salida: 1440 créditos / 1 M de tokens (≈ $7.20).
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Aion 3.5 API on ModelFold
Aion 3.5 is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family, in which several specialized models collaborate on each response. Try Aion 3.5 in the ModelFold Playground, then call it from your own code through an OpenAI-compatible chat completions API.
What Is the Aion 3.5 API
Aion 3.5 at a glance
Aion 3.5 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 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
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 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 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 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.
- 3
Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "aion-3-5" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
- ✓
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
Writing and content
Draft, edit and translate articles, emails, product copy and documentation in a consistent tone.
Analysis and complex reasoning
Work through research questions, data interpretation, planning and other problems that need careful step-by-step reasoning.
Multilingual products
Serve users in many languages with translation, localized support replies and cross-language search.
Frequently Asked Questions
What is Aion 3.5?⌄
Aion 3.5 is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family, in which several specialized models collaborate on each response.
Which inputs does Aion 3.5 support?⌄
Aion 3.5 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?⌄
Up to 262K tokens, shared between your input and the model’s output.
Does Aion 3.5 support function calling?⌄
Yes. Aion 3.5 supports tools / function calling through the standard tools parameter of the chat completions API.
How is Aion 3.5 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 through the API?⌄
Send a POST request to https://modelfold.ai/v1/chat/completions with "model": "aion-3-5", using your ModelFold API key as the Bearer token.
| Entrada | 720 créditos 1M tokens≈ $3.60 |
| Salida | 1440 créditos 1M tokens≈ $7.20 |
Se cobra por token, con tarifas separadas para entrada y salida. Los tokens de razonamiento cuentan como salida. El entorno de pruebas aplica exactamente el mismo cálculo.
Leer la documentación de la API →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","messages":[{"role":"user","content":"Hello"}]}'