Aion 3.5 Mini is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family of models. It is the smaller, lower-cost sibling of Aion 3.5 and uses...
Model details →AionLabs: Aion 3.5 Mini vs OpenAI: GPT-5.3-Codex
AionLabs: Aion 3.5 Mini and OpenAI: GPT-5.3-Codex are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-a…
Model details →Side-by-side comparison
| Capability | AionLabs: Aion 3.5 Mini | OpenAI: GPT-5.3-Codex | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 262K | 400K | 🏆 OpenAI: GPT-5.3-Codex |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.70 | $1.75 | 🏆 AionLabs: Aion 3.5 Mini |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $1.40 | $14.00 | 🏆 AionLabs: Aion 3.5 Mini |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | — | Yes | 🏆 OpenAI: GPT-5.3-Codex |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is AionLabs: Aion 3.5 Mini better than OpenAI: GPT-5.3-Codex?
AionLabs: Aion 3.5 Mini and OpenAI: GPT-5.3-Codex are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between AionLabs: Aion 3.5 Mini and OpenAI: GPT-5.3-Codex?
Input: $0.70 vs $1.75 per 1M tokens. Output: $1.40 vs $14.00 per 1M tokens.
What context windows do AionLabs: Aion 3.5 Mini and OpenAI: GPT-5.3-Codex support?
AionLabs: Aion 3.5 Mini supports up to 262K tokens. OpenAI: GPT-5.3-Codex supports up to 400K tokens.
Do both AionLabs: Aion 3.5 Mini and OpenAI: GPT-5.3-Codex support tool calling?
AionLabs: Aion 3.5 Mini: yes. OpenAI: GPT-5.3-Codex: yes.