Claude Fable 5.2

Claude Fable 5.2

Anthropic
5.0 out of 5 stars
Hy4

Hy4

Tencent
Claude Fable 5.2 Hy4

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Claude Fable 5.2:

About

Claude Fable 5.2 is an advanced AI reasoning model developed by Anthropic for complex software engineering, scientific research, technical problem-solving, and autonomous agent workflows. The model provides improvements in coding, mathematical reasoning, visual understanding, and long-running task execution compared with previous Claude Fable models. Its agentic capabilities allow AI systems to analyze large codebases, coordinate multiple subagents, develop software, investigate technical problems, and automate complex business processes. Claude Fable 5.2 generates outputs up to 30% faster than Fable 5.1 and offers an optional fast mode that increases generation speed by up to 2.5 times. The model includes configurable reasoning effort, advanced tool use, and specialized cybersecurity and biology safeguards designed to reduce misuse while supporting general technical work.
Hy4:

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.
Claude Fable 5.2:

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported
Hy4:

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported
Claude Fable 5.2:

Audience

Software engineers, AI developers, machine learning researchers, autonomous agent developers, scientific researchers, mathematicians, data scientists, robotics engineers, hardware designers, DevOps professionals, enterprise technology teams, and organizations seeking frontier AI reasoning, autonomous software engineering, complex research automation, advanced coding, technical analysis, and multi-agent workflow orchestration
Hy4:

Audience

Developers, researchers, and technical professionals seeking an AI model for coding, document work, game development, scientific reasoning, and complex productivity tasks
Claude Fable 5.2:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
Hy4:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
Claude Fable 5.2:

API

Offers API Supported
Hy4:

API

Offers API Supported
Claude Fable 5.2:

Screenshots and Videos

Hy4:

Screenshots and Videos

Claude Fable 5.2:

Pricing

$8 per 1M tokens (input)
$8 per million input tokens and $40 per million output tokens
Free Version Not Supported
Free Trial Not Supported
Hy4:

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported
Claude Fable 5.2:

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
Hy4:

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
Claude Fable 5.2:

Pros & Cons from Real Users

Pros

  • Fable 5.2 feels like the model I reach for when I have something genuinely difficult and do not want to babysit it the whole way through. The biggest upgrade for me is how well it handles ambiguous, long-running work. I can give it a messy engineering task or a loose idea and it does a much better job figuring out the path, delegating pieces, correcting itself, and actually getting to the finish line.

Cons

  • My only complaint is that this is still a model I would save for the hard stuff. Anthropic itself recommends starting with Opus 5.5 for normal coding and knowledge work, then stepping up to Fable when the task really justifies it.
Claude Fable 5.2:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
Hy4:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
Claude Fable 5.2:

Company Information

Anthropic
Founded: 2021
United States
claude.ai
Hy4:

Company Information

Tencent
Founded: 1998
China
hy.tencent.ai/research/hy4-preview
Claude Fable 5.2:

Alternatives

Gemini 4 Hydrogen

Gemini 4 Hydrogen

Google
5.0 out of 5 stars
Hy4:

Alternatives

Gemini 4 Hydrogen

Gemini 4 Hydrogen

Google
5.0 out of 5 stars
Claude Fable 5.2:
Hy4:
Claude Fable 5.2

Claude Fable 5.2

Anthropic
5.0 out of 5 stars
Claude Fable 5.2:
GPT-6.1 Terra

GPT-6.1 Terra

OpenAI
5.0 out of 5 stars
Hy4:
Claude Fable 5.2:
Claude Fable 5.1

Claude Fable 5.1

Anthropic
5.0 out of 5 stars
Hy4:
Claude Fable 5.2:
Claude Fable 5

Claude Fable 5

Anthropic
5.0 out of 5 stars
Hy4:
Qwen3.5

Qwen3.5

Alibaba
Claude Fable 5.2:

Categories

AI Coding Models Supported
AI Models Supported
AI Vision Models Supported
Foundation Models Supported
Multimodal Models Supported
Hy4:

Categories

AI Coding Models Supported
AI Models Supported
Foundation Models Supported
Claude Fable 5.2:

Integrations

Anything Supported
CLion Supported
Cheaper Inference Supported
Claude Agent SDK Supported
Claude Cowork Supported
Claude Desktop Supported
Claude Science Supported
Claude Slides Supported
Dessix Supported
Elixir Supported
Factory Droid Supported
GitAuto Supported
Microsoft Foundry Supported
Muse Supported
PowerShell Supported
Python Supported
Shipper.now Supported
Twigg Supported
Verdent Supported
Visual Basic Supported
Hy4:

Integrations

Anything Not Supported
CLion Not Supported
Cheaper Inference Not Supported
Claude Agent SDK Not Supported
Claude Cowork Not Supported
Claude Desktop Not Supported
Claude Science Not Supported
Claude Slides Not Supported
Dessix Not Supported
Elixir Not Supported
Factory Droid Not Supported
GitAuto Not Supported
Microsoft Foundry Not Supported
Muse Not Supported
PowerShell Not Supported
Python Not Supported
Shipper.now Not Supported
Twigg Not Supported
Verdent Not Supported
Visual Basic Not Supported
Claude Fable 5.2:
Claim Claude Fable 5.2 and update features and information
Claim Claude Fable 5.2 and update features and information
Hy4:
Claim Hy4 and update features and information
Claim Hy4 and update features and information