AION

AION Models (developed by Aion Labs) is a family of specialized large language models and multi-model collaborative reasoning systems served via a drop-in OpenAI-compatible REST API (https://api.aionlabs.ai/v1). Aion Labs fine-tunes, orchestrates, and hosts language models designed for multi-turn chat completions, structured narrative generation, roleplaying, and collaborative multi-model reasoning.

Entity Disambiguation

Aion Labs (aionlabs.ai) is an artificial intelligence model serving and LLM API provider. It is distinct from the Israeli pharmaceutical and biotech venture incubator operating under the same name (AION Labs / aionlabs.com).

Model Portfolio & Architecture

The Aion Labs API provides access to distinct model families and multi-model reasoning pipelines:

• Aion 3.5 & Aion 3.5 Mini: Multi-model collaborative generation systems built on GLM foundation models, supporting up to a 256K-token context window and 32K max output tokens. These systems employ a collaborative inference process where multiple specialized models contribute to each response.
• Aion 3.0 & Aion 3.0 Mini: Multi-model reasoning systems built on GLM and DeepSeek model families with a 128K-token context window and 32K max output tokens.
• Aion 2.0: A fine-tuned variant of DeepSeek V3.2 featuring a 128K-token context window, optimized for storytelling, narrative roleplaying, and nuanced conflict resolution.
• Aion-RP 1.0 (8B): A fine-tuned Llama 3.1 8B parameter model with a 32K-token context window, specialized for lightweight roleplay and narrative generation.

API Architecture & Developer Tooling

Aion Labs exposes versioned /v1/ REST API endpoints (POST /v1/chat/completions and a public GET /v1/models endpoint for model discovery). The API is drop-in compatible with official OpenAI SDKs (Python, JavaScript/TypeScript) and standard HTTP clients by updating the API base URL to https://api.aionlabs.ai/v1 and supplying a Bearer API key in request headers.

Aion Labs provides an interactive browser-based testing workspace for prompt evaluation alongside account management tools for API key provisioning, token usage analytics, rate-limit tier monitoring, and per-token billing controls.