AionLabs: Aion 3.5

AionLabs: Aion 3.5 is a text-to-text system designed around roleplaying and storytelling, built on the GLM family of foundation models from AionLabs. Rather than relying on a single generative pass, the model coordinates multiple specialized components in a collaborative generation process, letting each contribute to different aspects of a scene or narrative. It was released on September 23, 2026, and shares the same 262K-token context window as its sibling variant, Aion 3.5 Mini, fitting long-form interactive fiction and multi-turn roleplay scenarios where continuity matters.

In third-party benchmarking, Aion 3.5 stands out for exceptional reliability, posting a 100% success rate across eight evaluated tasks with no technical failures. It earns perfect accuracy on Hallucinations, General Knowledge, Reasoning, and Ethics benchmarks, and follows that up with 97.0% on Coding and 99.0% on Email Classification, while its Mathematics score lands at 92.9%. The primary weakness surfaces in Instruction Following, where it reaches only 65.0%, suggesting that complex, layered directives remain harder than open-ended reasoning. Overall the model is positioned for demanding creative and analytical applications where ethical grounding, factual steadiness, and consistent execution outweigh raw instruction adherence.