Hy4

Hy4

Tencent
+
+

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About

GPT-5.6 Luna is the fast and affordable model in OpenAI’s GPT-5.6 series, built to bring strong capability to users and developers who need practical intelligence with lower overhead. In the new GPT-5.6 naming system, the number identifies the model generation, while Sol, Terra, and Luna identify durable capability tiers that can advance on their own cadence, giving people and developers clearer choices across intelligence, speed, and cost. Luna sits alongside Sol, the flagship model, and Terra, the balanced model for everyday work, as part of a family designed for broader access to next-generation AI. During the limited preview, GPT-5.6 models are initially available through the API and Codex to a select group of trusted partners and organizations, with plans for broader availability in ChatGPT, Codex, and the API. OpenAI developed GPT-5.6 Sol, Terra, and Luna with its most robust safeguards to date, with configurations matched to each model’s capabilities.

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

Developers and product teams that need a fast model for everyday AI features, coding support, API workflows, and scalable assistant experiences

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

$0.20 per 1M tokens (input)
$0.20 input / $1.20 output per 1 million tokens
Free Version
Free Trial

Pricing

No information available.
Free Version
Free Trial

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 4.0 / 5
design 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

  • GPT-5.6 Luna is the one I would use when speed and cost matter most. As a developer, I can see it being really useful for lightweight coding help, quick explanations, small refactors, simple scripts, test generation, issue triage, and agent steps that do not need the most expensive model in the stack. I also like Luna for multi-agent systems where a lot of small tasks need to run in parallel. OpenAI describes Luna as the fastest and most cost-efficient GPT-5.6 model, and that is exactly the kind of model developers need for high-volume workflows.

Cons

  • Luna is not the model I would choose for the hardest reasoning tasks. If I were debugging a complicated distributed system, planning a major architecture change, or running a long autonomous coding agent, I would probably step up to Terra or Sol. It also depends heavily on good task routing. Luna can be extremely valuable when used for the right jobs, but expecting it to perform like the flagship model on every problem would be the wrong approach.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

OpenAI
Founded: 2015
United States
openai.com

Company Information

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

Alternatives

Grok 4.6

Grok 4.6

SpaceXAI

Alternatives

Grok 4.6

Grok 4.6

SpaceXAI
Claude Opus 5

Claude Opus 5

Anthropic
Claude Opus 5

Claude Opus 5

Anthropic
Claude Fable 5

Claude Fable 5

Anthropic
Claude Fable 5

Claude Fable 5

Anthropic
GPT-5.6 Sol

GPT-5.6 Sol

OpenAI

Categories

Categories

Integrations

Agentforce Vibes
Bash
CSS
ChatGPT Canvas
ChatGPT Go
Cosmos
EaseMate AI
GPT-5.5-Cyber
Kineto by JetBrains
Kotlin
Lovable
Microsoft Copilot Studio
Node.js
OpenCode
Perplexity Computer
SimpleClaw
Use AI
Vercel AI Gateway
Verdent
Yonoo

Integrations

Agentforce Vibes
Bash
CSS
ChatGPT Canvas
ChatGPT Go
Cosmos
EaseMate AI
GPT-5.5-Cyber
Kineto by JetBrains
Kotlin
Lovable
Microsoft Copilot Studio
Node.js
OpenCode
Perplexity Computer
SimpleClaw
Use AI
Vercel AI Gateway
Verdent
Yonoo
Claim GPT-5.6 Luna and update features and information
Claim GPT-5.6 Luna and update features and information
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