Aion 3.5 is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family of models. It uses a collaborative generation process in which multiple specialized models each...
Model details →AionLabs: Aion 3.5 vs OpenAI: GPT-5.6 Sol Pro
AionLabs: Aion 3.5 and OpenAI: GPT-5.6 Sol Pro are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
GPT-5.6 Sol Pro is the same underlying model as [GPT-5.6 Sol](https://openrouter.ai/openai/gpt-5.6-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://develope…
Model details →Side-by-side comparison
| Capability | AionLabs: Aion 3.5 | OpenAI: GPT-5.6 Sol Pro | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 262K | 1.1M | 🏆 OpenAI: GPT-5.6 Sol Pro |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $3.00 | $4.00 | 🏆 AionLabs: Aion 3.5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $6.00 | $20.00 | 🏆 AionLabs: Aion 3.5 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | — | Yes | 🏆 OpenAI: GPT-5.6 Sol Pro |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is AionLabs: Aion 3.5 better than OpenAI: GPT-5.6 Sol Pro?
AionLabs: Aion 3.5 and OpenAI: GPT-5.6 Sol Pro 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 and OpenAI: GPT-5.6 Sol Pro?
Input: $3.00 vs $4.00 per 1M tokens. Output: $6.00 vs $20.00 per 1M tokens.
What context windows do AionLabs: Aion 3.5 and OpenAI: GPT-5.6 Sol Pro support?
AionLabs: Aion 3.5 supports up to 262K tokens. OpenAI: GPT-5.6 Sol Pro supports up to 1.1M tokens.
Do both AionLabs: Aion 3.5 and OpenAI: GPT-5.6 Sol Pro support tool calling?
AionLabs: Aion 3.5: yes. OpenAI: GPT-5.6 Sol Pro: yes.