Claude Fable 5.2

Claude Fable 5.2

Anthropic
5.0 out of 5 stars
Composer 2.5

Composer 2.5

Cursor
5.0 out of 5 stars
+
+

Related Products

  • Gemini Enterprise Agent Platform
    4.3 out of 5 stars 1,178 Ratings
    Visit Website for Gemini Enterprise Agent Platform
  • LTX
    4.4 out of 5 stars 182 Ratings
    Visit Website for LTX
  • Google AI Studio
    4.8 out of 5 stars 42 Ratings
    Visit Website for Google AI Studio
  • Evertune
    5.0 out of 5 stars 1 Rating
    Visit Website for Evertune
  • Jotform
    4.6 out of 5 stars 9,009 Ratings
    Visit Website for Jotform
  • LM-Kit.NET
    4.8 out of 5 stars 29 Ratings
    Visit Website for LM-Kit.NET
  • Concord
    4.6 out of 5 stars 237 Ratings
    Visit Website for Concord
  • SearchUnify
    4.5 out of 5 stars 150 Ratings
    Visit Website for SearchUnify
  • Canditech
    5.0 out of 5 stars 111 Ratings
    Visit Website for Canditech
  • Checksum.ai
    5.0 out of 5 stars 2 Ratings
    Visit Website for Checksum.ai

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.

About

Composer 2.5 is the latest AI coding model released by Cursor, offering major improvements in intelligence, collaboration, and long-task performance compared to Composer 2. The model is designed to follow complex instructions more accurately while providing a smoother and more natural user experience during coding sessions. Cursor enhanced Composer 2.5 through larger-scale training, more advanced reinforcement learning environments, and improved behavioral tuning focused on communication and effort calibration. The model uses targeted reinforcement learning with textual feedback to correct specific mistakes during training, helping it avoid issues like invalid tool calls or poor coding behavior. Composer 2.5 was also trained using significantly more synthetic coding tasks, enabling it to handle increasingly difficult programming challenges and real-world development scenarios.

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

Platforms Supported

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

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

Audience

Software developers, engineering teams, AI researchers, and enterprise organizations looking for advanced AI-assisted coding and large-scale software development solutions

Support

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

Support

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

API

Offers API Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

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

Pricing

$0.50/M input
$0.50/M input and $2.50/M output tokens
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5

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.

Pros & Cons from Real Users

Pros

  • Composer 2.5 feels like a very practical coding model because it is built for the place I actually use it: Cursor. It is fast, focused, and tuned for agentic coding work instead of trying to be a general-purpose chatbot that also happens to write code. The cost-performance balance is the biggest win. If a model can stay near the top of coding-agent rankings while being dramatically cheaper than heavier flagship models, that matters a lot for everyday development. I also like that it feels optimized for real Cursor workflows. It can help with multi-file edits, repo exploration, implementation, debugging, and agent-style tasks without making every run feel slow or expensive.

Cons

  • Composer 2.5 is still not the model I would blindly trust for every hard architecture decision or risky production change. I would still review diffs, run tests, and use stronger models when the task needs deeper reasoning. It is also tied closely to Cursor, which is great if you already live there, but less ideal if you want a model you can use everywhere with the same workflow.

Training

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

Training

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

Company Information

Anthropic
Founded: 2021
United States
claude.ai

Company Information

Cursor
Founded: 2022
United States
cursor.com

Alternatives

Alternatives

Claude Code

Claude Code

Anthropic
5.0 out of 5 stars
GPT-6.1 Terra

GPT-6.1 Terra

OpenAI
5.0 out of 5 stars
GPT-6.1 Sol

GPT-6.1 Sol

OpenAI
5.0 out of 5 stars
GPT-6.1 Terra

GPT-6.1 Terra

OpenAI
5.0 out of 5 stars
Claude Fable 5.1

Claude Fable 5.1

Anthropic
5.0 out of 5 stars
Claude Fable 5

Claude Fable 5

Anthropic
5.0 out of 5 stars
Composer 1

Composer 1

Cursor

Categories

AI Coding Models Supported
AI Models Supported
AI Vision Models Supported
Foundation Models Supported
Multimodal Models Supported

Categories

AI Coding Models Supported
AI Models Supported

Integrations

.NET Supported
C# Supported
C++ Supported
CSS Supported
Go Supported
HTML Supported
JavaScript Supported
Kotlin Supported
Kubernetes Supported
Objective-C Supported
PHP Supported
PowerShell Supported
Ruby Supported
Rust Supported
SQL Supported
Scala Supported
Swift Supported
TypeScript Supported
XML Supported
YAML Supported

Integrations

.NET Supported
C# Supported
C++ Supported
CSS Supported
Go Supported
HTML Supported
JavaScript Supported
Kotlin Supported
Kubernetes Supported
Objective-C Supported
PHP Supported
PowerShell Supported
Ruby Supported
Rust Supported
SQL Supported
Scala Supported
Swift Supported
TypeScript Supported
XML Supported
YAML Supported
Claim Claude Fable 5.2 and update features and information
Claim Claude Fable 5.2 and update features and information
Claim Composer 2.5 and update features and information
Claim Composer 2.5 and update features and information