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About

Claude Fable 5.1 is Anthropic’s advanced AI model for coding, knowledge work, research, and long-running agentic tasks. It is designed to improve on Claude Fable 5 with stronger performance across software engineering, scientific research, multidisciplinary reasoning, computer use, business workflows, and complex problem solving. The model can handle extended multi-step work, verify its own results, diagnose difficult software issues, and operate effectively across tool-heavy workflows. Anthropic also reduced cache-read pricing for Fable 5.1, lowering typical usage costs compared with Fable 5 and creating larger savings for highly agentic workloads. Fable 5.1 includes updated safeguards intended to reduce false positives while allowing more legitimate cybersecurity tasks such as vulnerability discovery for defensive purposes. The model is available through Claude products, the Claude API, Amazon Web Services, Google Cloud, and Microsoft Azure.

About

OpenAI Astra is an upcoming frontier AI model concept designed for advanced reasoning, multimodal understanding, agentic workflows, and long-horizon work. The model would be positioned to help users move from simple prompts to complete, high-quality deliverables across coding, research, business analysis, creative production, and knowledge work. Astra would combine text, image, document, voice, and tool-based capabilities into a more unified AI experience. It would be built for complex tasks that require planning, execution, verification, and iteration across multiple steps. Developers and teams could use Astra to power AI agents, productivity tools, coding assistants, research systems, and enterprise applications. As a next-generation OpenAI model concept, Astra would represent a shift toward AI systems that can reason, act, and collaborate across real-world workflows.

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, researchers, enterprises, analysts, knowledge workers, and AI application teams that need advanced coding, reasoning, research, and long-running agentic capabilities

Audience

OpenAI Astra would be best suited for developers, enterprises, AI agent builders, researchers, product teams, software engineers, analysts, creators, operations teams, and organizations that need frontier reasoning, multimodal intelligence, agentic workflows, coding assistance, document analysis, tool use, workflow automation, research support, and AI-native application development

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

No images available

Pricing

$10 per 1M tokens (input)
$10 per million input tokens and $50 per million 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

  • This feels like the model you reach for when the work is genuinely difficult. Not every task needs Fable, but for complex coding, long-horizon agents, deep research, and big messy knowledge-work projects, Fable 5.1 looks built for the hard stuff. The 1M-token context window is a huge advantage. For developers and AI power users, that means you can work across large repos, long docs, research sets, transcripts, spreadsheets, and project history without constantly chopping everything into pieces. I also like that Anthropic specifically calls out document, spreadsheet, and slide work. That makes it feel useful beyond coding alone — more like a high-end model for serious professional workflows.

Cons

  • The downside is price and complexity. Anthropic says most workloads should start with Claude Opus 5, and Fable 5.1 is better reserved for demanding reasoning or cases where Opus 5 still falls short.

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

OpenAI
Founded: 2015
United States
openai.com

Alternatives

Alternatives

GPT-5.6 Sol

GPT-5.6 Sol

OpenAI
GPT-6

GPT-6

OpenAI
Grok 4.6

Grok 4.6

SpaceXAI
Claude Fable 5

Claude Fable 5

Anthropic
GPT-5.6 Sol

GPT-5.6 Sol

OpenAI
Claude Opus 5

Claude Opus 5

Anthropic
GPT-5.4

GPT-5.4

OpenAI

Categories

Categories

Integrations

App0
Bash
Brokk
CSS
Charlie
DataGrip
F#
Flowise
GitHub
GoLand
Julia
Kotlin
Muse
OpenCode
R
Scalestack
Snowflake
Springhub
Swift
Versuno

Integrations

App0
Bash
Brokk
CSS
Charlie
DataGrip
F#
Flowise
GitHub
GoLand
Julia
Kotlin
Muse
OpenCode
R
Scalestack
Snowflake
Springhub
Swift
Versuno
Claim Claude Fable 5.1 and update features and information
Claim Claude Fable 5.1 and update features and information
Claim OpenAI Astra and update features and information
Claim OpenAI Astra and update features and information