Hy4

Hy4

Tencent
+
+

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About

Composer 2.5 is the latest AI coding model released by Cursor, offering major improvements in intelligence, collaboration, and long-task performance compared to Composer 2. The model is designed to follow complex instructions more accurately while providing a smoother and more natural user experience during coding sessions. Cursor enhanced Composer 2.5 through larger-scale training, more advanced reinforcement learning environments, and improved behavioral tuning focused on communication and effort calibration. The model uses targeted reinforcement learning with textual feedback to correct specific mistakes during training, helping it avoid issues like invalid tool calls or poor coding behavior. Composer 2.5 was also trained using significantly more synthetic coding tasks, enabling it to handle increasingly difficult programming challenges and real-world development scenarios.

About

Hy4 preview is a new-generation open source Mixture-of-Experts flagship model built for real-world productivity tasks across software engineering, office work, game development, and scientific research. The model contains 770B total parameters with 49B activated per token and supports a 1M-token context window, giving it the capacity to work through large codebases, extensive document collections, and long multi-step tasks. Its 78-layer architecture combines Gated DeepSeek Sparse Attention with IndexCache for cross-layer sparse index reuse and identity Hyper-Connections to expand information flow between layers. A native Multi-Token Prediction layer is included for speculative decoding. Hy4 preview is designed to understand, plan, debug, and verify long-horizon engineering tasks, with additional gains in front-end visual quality and interaction design.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Software developers, engineering teams, AI researchers, and enterprise organizations looking for advanced AI-assisted coding and large-scale software development solutions

Audience

Developers, researchers, and technical professionals seeking an AI model for coding, document work, game development, scientific reasoning, and complex productivity tasks

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

$0.50/M input
$0.50/M input and $2.50/M output tokens
Free Version
Free Trial

Pricing

No information available.
Free Version
Free Trial

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Pros & Cons from Real Users

Pros

  • Composer 2.5 feels like a very practical coding model because it is built for the place I actually use it: Cursor. It is fast, focused, and tuned for agentic coding work instead of trying to be a general-purpose chatbot that also happens to write code. The cost-performance balance is the biggest win. If a model can stay near the top of coding-agent rankings while being dramatically cheaper than heavier flagship models, that matters a lot for everyday development. I also like that it feels optimized for real Cursor workflows. It can help with multi-file edits, repo exploration, implementation, debugging, and agent-style tasks without making every run feel slow or expensive.

Cons

  • Composer 2.5 is still not the model I would blindly trust for every hard architecture decision or risky production change. I would still review diffs, run tests, and use stronger models when the task needs deeper reasoning. It is also tied closely to Cursor, which is great if you already live there, but less ideal if you want a model you can use everywhere with the same workflow.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Cursor
Founded: 2022
United States
cursor.com

Company Information

Tencent
Founded: 1998
China
hy.tencent.ai/research/hy4-preview

Alternatives

Claude Code

Claude Code

Anthropic

Alternatives

GPT-5.6 Sol

GPT-5.6 Sol

OpenAI
GPT-5.6 Sol

GPT-5.6 Sol

OpenAI
Grok 4.6

Grok 4.6

SpaceXAI
Composer 1

Composer 1

Cursor

Categories

Categories

Integrations

Bash
C
C#
Dart
Go
Grok Build
HTML
Java
Kubernetes
PowerShell
Python
R
Ruby
Rust
SQL
Swift
Tencent Hy
TypeScript
XML
YAML

Integrations

Bash
C
C#
Dart
Go
Grok Build
HTML
Java
Kubernetes
PowerShell
Python
R
Ruby
Rust
SQL
Swift
Tencent Hy
TypeScript
XML
YAML
Claim Composer 2.5 and update features and information
Claim Composer 2.5 and update features and information
Claim Hy4 and update features and information
Claim Hy4 and update features and information