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

GLM-5.3-Flash is Z.ai’s natively multimodal model in the GLM-5 series (previously previewed as Ox Alpha), designed to deliver strong coding, agentic, visual, and knowledge-work performance at relatively low inference cost. It uses 320 billion total parameters with 18 billion active parameters, along with a hybrid architecture that combines sparse and linear attention to reduce the cost of long-context processing. The model supports context lengths of up to one million tokens and was trained on a 30-trillion-token multimodal corpus. GLM-5.3-Flash can reason across text, images, documents, interfaces, dashboards, and other visual information while using that feedback to refine its own outputs. Z.ai reports substantial gains over GLM-5.2 on coding and agentic benchmarks, including DeepSWE and AutomationBench, while approaching higher-cost frontier models on several evaluations.

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, AI engineers, agent builders, researchers, and organizations that need cost-efficient multimodal reasoning, long-context processing, advanced coding, visual analysis, and autonomous workflow capabilities

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

$0.15 per 1M tokens (input)
Input: $0.15 per 1M tokens
Output: $0.50 per 1M tokens
Cached input: $0.03 per 1M tokens
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
ease 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

  • What makes it exciting is that it seems built for the exact workloads developers care about right now: long-horizon coding, complex reasoning, big-context analysis, and agentic workflows. A million-token context window is especially useful if you want to drop in a large repo, long spec, research corpus, or messy project history and have the model reason across it.

Cons

  • I would treat it as something exciting to test, not something to blindly trust with sensitive work. Even the independent Ox Alpha site warns that messages are processed by the upstream model API, so I would keep secrets, private code, and customer data out of it until there is a clearer owner, model card, privacy policy, and production story.

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

Z.ai
Founded: 2019
China
z.ai

Alternatives

Grok 4.6

Grok 4.6

SpaceXAI

Alternatives

Grok 4.6

Grok 4.6

SpaceXAI
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Claude Fable 5

Claude Fable 5

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Claude Sonnet 5

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MiniMax M3

MiniMax M3

MiniMax
Claude Opus 4.8

Claude Opus 4.8

Anthropic
Qwen3.5

Qwen3.5

Alibaba

Categories

Categories

Integrations

Cheaper Inference
Claude Code
Hermes Agent
OpenClaw
Pi Agent
CSS
Claude Pro
Clawd.run
Devin Desktop
HTML
JavaScript
Muses
Objective-C
OpenCode Go
Rider
Shipper.now
Trinity-Large-Thinking
Use AI
Visual Studio Code
Yonoo

Integrations

Cheaper Inference
Claude Code
Hermes Agent
OpenClaw
Pi Agent
CSS
Claude Pro
Clawd.run
Devin Desktop
HTML
JavaScript
Muses
Objective-C
OpenCode Go
Rider
Shipper.now
Trinity-Large-Thinking
Use AI
Visual Studio Code
Yonoo
Claim Claude Fable 5 and update features and information
Claim Claude Fable 5 and update features and information
Claim GLM-5.3-Flash and update features and information
Claim GLM-5.3-Flash and update features and information