Claude Fable 5

Claude Fable 5

Anthropic
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About

Claude Fable 5 is an advanced AI model from Anthropic designed to assist with software engineering, research, knowledge work, vision tasks, and complex reasoning. Built on the Mythos-class architecture, it delivers significantly improved performance across coding, analysis, and long-context workflows. The model can handle extended autonomous tasks while maintaining focus and consistency over large amounts of information. Claude Fable 5 integrates advanced reasoning, multimodal understanding, and memory capabilities to support professional and enterprise use cases. Anthropic has implemented specialized safeguards that automatically route certain high-risk cybersecurity, biology, chemistry, and model distillation requests to a different model. Claude Fable 5 helps organizations and professionals accelerate complex work while maintaining strong safety and governance controls.

About

Muse Glimmer is a 30-billion-parameter open-weights model from Meta Superintelligence Labs, optimized for always-on local agent workflows. Small enough to run on a Mac or PC with a single consumer GPU, it is designed for local agents, function calling, coding, and LLM-as-a-judge evaluation without depending on cloud infrastructure or network access. The model combines long-horizon execution, precise tool calling, multimodal understanding, long-context memory, and instruction following. It can complete end-to-end agentic tasks, sustain multi-step reasoning across extended workflows, recover from failed or unexpected tool calls, and accept interleaved text and images through a dedicated perception encoder for interpreting screenshots, charts, and documents. Muse Glimmer works with OpenClaw and other agentic orchestration patterns, supports controllable reasoning effort, and is trained on data from more than 100 languages.

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

Claude Fable 5 is designed for software engineers, researchers, enterprise organizations, data analysts, scientists, product teams, developers, business professionals, knowledge workers, and organizations seeking advanced AI for coding, research, automation, analysis, and enterprise productivity

Audience

Developers building private, always-on AI agents that need strong reasoning, tool use, and multimodal capabilities on local hardware

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

$10 per 1 million (input)
$10 per million input tokens and $50 per million output tokens
Free Version
Free Trial

Pricing

Free
Free Version
Free Trial

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 5

Reviews/Ratings

Overall 5.0 / 5

Pros & Cons from Real Users

Pros

  • Claude Fable 5 is the most capable coding model I've used for complex software development. It understands large codebases remarkably well and can maintain context across long implementation sessions without losing track of requirements. The model excels at architecture discussions, debugging difficult issues, and generating production-quality code. Its reasoning feels more deliberate than many competing models, making it especially valuable for backend development, refactoring, and technical design work. I was particularly impressed by its ability to handle multi-step engineering tasks. Instead of solving problems one prompt at a time, it often anticipates edge cases and implementation details before I ask.

Cons

  • The safety guardrails can occasionally get in the way of legitimate security-related development work. Certain cybersecurity topics may be redirected to a less capable model, which can interrupt advanced technical workflows. Pricing is also higher than previous Claude models, which may be a consideration for teams with heavy API usage. Like any AI coding assistant, it still requires careful review of generated code before deployment, especially for critical production systems.

Pros & Cons from Real Users

Pros

  • Muse Glimmer is exciting because it brings serious AI capability closer to the device. An open-weight model that can run on a laptop or desktop is a big deal for developers, builders, and AI power users who want more control. I like that it is focused on agentic tasks, not just basic chat. If it can handle reasoning, coding help, workflow automation, and local experimentation well, it could be really useful for private projects and always-on agents. The open-weight angle is the biggest win. Being able to download, modify, and run the model locally makes Muse Glimmer feel much more flexible than a closed API-only model.

Cons

  • I would still want to test it hard before trusting it for serious work. Smaller local models can be impressive, but they still need to prove themselves on coding, tool use, long tasks, and messy real-world prompts. Running locally also means the experience depends on your hardware. Even if it works on consumer devices, performance, speed, and setup may vary a lot.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Anthropic
Founded: 2021
United States
claude.ai

Company Information

Meta
Founded: 2004
United States
meta.ai/

Alternatives

Claude Opus 5

Claude Opus 5

Anthropic

Alternatives

Claude Mythos 5

Claude Mythos 5

Anthropic
Claude Sonnet 5

Claude Sonnet 5

Anthropic
Claude Opus 4.8

Claude Opus 4.8

Anthropic
Claude Opus 4.7

Claude Opus 4.7

Anthropic

Categories

Categories

Integrations

Hermes Agent
OpenClaw
OpenCode
Aider
Buda
Charlie
Dart
Devin Desktop
Emergent
GitAuto
Java
Lua
Microsoft Foundry
Muse
PHP
Python
Revise
Sup AI
Swift
Xcode

Integrations

Hermes Agent
OpenClaw
OpenCode
Aider
Buda
Charlie
Dart
Devin Desktop
Emergent
GitAuto
Java
Lua
Microsoft Foundry
Muse
PHP
Python
Revise
Sup AI
Swift
Xcode
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