MindLab launches Macaron-V1, a 748B open-weight agent model with 2M-token RL

青稞AI · wechat · 2026-07-24

MindLab releases Macaron-V1, an open-weight agent model family

Macaron-V1 comes in two versions: Venti, a 748B open-weight flagship built on a GLM-5.2 base with four 1B LoRA experts, and Tall, a lighter local-deployable version built on Qwen3.6 with four 3.7B LoRA experts.

What’s new

Uses a Mixture-of-LoRA (MoL) architecture so specialized capabilities can be trained, updated, and plugged in independently.
Introduces LongStraw, which extends reinforcement learning training to 2 million tokens of context.
Trains the model around tool use, terminal operations, software engineering, and UI generation, with a harness designed to match production deployment.

Claimed results

MindLab says Macaron-V1 can match or exceed Opus 4.8, GPT-5.5, and Gemini 3.1 Pro on many of its benchmarks.
It highlights especially strong performance in life-like tasks, coding, and generative UI.

Release details

All versions are open-weight on Hugging Face.
An API is available for Venti, plus a coding-focused version and a local-deployable Tall variant.
The team also open-sourced its long-context RL paper and a plugin for rendering UI4A outputs.

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MindLab launches Macaron-V1, a 748B open-weight agent model with 2M-token RL

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