# Cua — Agent Framework 0.4 with Composite Agents: Two Brains Are Better Than One

- Company: Cua (cua.ai)
- Announced: 2025-08-27
- Category: developer-tool-release
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://cua.ai/blog/composite-agents
- Record: https://forck.live/items/16834-agent-framework-0-4-with-composite-agents-two-brains-are-better-than-one
- Subject: Cua Driver / Lume / Cua Bench / Cua Fleets
- Models affected: anthropic/claude-sonnet-4-5-20250929, huggingface-local/ByteDance-Seed/UI-TARS-1.5-7B, huggingface-local/HelloKKMe/GTA1-7B, huggingface-local/OpenGVLab/InternVL3_5-8B, openai/gpt-4o

Cua released Agent framework 0.4, which normalizes coordinate systems and output formats across GUI models from providers including Anthropic, OpenAI, Hugging Face, and OpenRouter. The update introduces composite agents that pair a grounding model for visual understanding with a planning model for reasoning, enabling models not designed for computer use, such as GPT-4o, to gain GUI capabilities.

## Evidence

Verbatim from https://cua.ai/blog/composite-agents:

> Instead of writing separate code for each model's peculiarities, you now just pick a model with a string like "anthropic/claude-sonnet-4-5-20250929" or "huggingface-local/ByteDance-Seed/UI-TARS-1.5-7B", and everything else Just Works™. Behind the scenes, we handle all the coordinate normalization, token parsing, and image preprocessing so you don't have to.

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Record: https://forck.live/items/16834-agent-framework-0-4-with-composite-agents-two-brains-are-better-than-one
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