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What is Composer 1?

Composer is an AI model developed by Cursor, specifically designed for software engineering tasks, providing fast and interactive coding assistance within the Cursor IDE, an upgraded version of a VS Code-based editor that features intelligent automation capabilities. This model uses a mixture-of-experts framework and reinforcement learning (RL) to address real-world coding challenges encountered in large codebases, allowing it to offer quick, contextually relevant responses that include code adjustments, planning, and insights into project frameworks, tools, and conventions, achieving generation speeds that are nearly four times faster than those of its peers in performance evaluations. With a focus on the development workflow, Composer incorporates long-context understanding, semantic search functionalities, and limited tool access (including file manipulation and terminal commands) to effectively resolve complex engineering questions with practical and efficient solutions. Its distinctive architecture not only enables adaptability across various programming environments but also ensures that users receive personalized support tailored to their individual coding requirements. Furthermore, the versatility of Composer allows it to evolve alongside the ever-changing landscape of software development, making it an invaluable resource for developers seeking to enhance their coding experience.

What is Claude Opus 4.5?

Claude Opus 4.5 represents a major leap in Anthropic’s model development, delivering breakthrough performance across coding, research, mathematics, reasoning, and agentic tasks. The model consistently surpasses competitors on SWE-bench Verified, SWE-bench Multilingual, Aider Polyglot, BrowseComp-Plus, and other cutting-edge evaluations, demonstrating mastery across multiple programming languages and multi-turn, real-world workflows. Early users were struck by its ability to handle subtle trade-offs, interpret ambiguous instructions, and produce creative solutions—such as navigating airline booking rules by reasoning through policy loopholes. Alongside capability gains, Opus 4.5 is Anthropic’s safest and most robustly aligned model, showing industry-leading resistance to strong prompt-injection attacks and lower rates of concerning behavior. Developers benefit from major upgrades to the Claude API, including effort controls that balance speed versus capability, improved context efficiency, and longer-running agentic processes with richer memory. The platform also strengthens multi-agent coordination, enabling Opus 4.5 to manage subagents for complex, multi-step research and engineering tasks. Claude Code receives new enhancements like Plan Mode improvements, parallel local and remote sessions, and better GitHub research automation. Consumer apps gain better context handling, expanded Chrome integration, and broader access to Claude for Excel. Enterprise and premium users see increased usage limits and more flexible access to Opus-level performance. Altogether, Claude Opus 4.5 showcases what the next generation of AI can accomplish—faster work, deeper reasoning, safer operation, and richer support for modern development and productivity workflows.

Media

Media

Integrations Supported

Cursor
Charlie
Claude
Claude Code
Claude Pro
Elixir
GitHub
GitHub Copilot CLI
Java
JavaScript
LaunchLemonade
Lovable
Node.js
Orchids
PHP
Revise
Ruby
Scala
Skymel
Sup AI

Integrations Supported

Cursor
Charlie
Claude
Claude Code
Claude Pro
Elixir
GitHub
GitHub Copilot CLI
Java
JavaScript
LaunchLemonade
Lovable
Node.js
Orchids
PHP
Revise
Ruby
Scala
Skymel
Sup AI

API Availability

Has API

API Availability

Has API

Pricing Information

$20 per month
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Cursor

Date Founded

2023

Company Location

United States

Company Website

cursor.com/blog/composer

Company Facts

Organization Name

Anthropic

Date Founded

2021

Company Location

United States

Company Website

www.anthropic.com/news/claude-opus-4-5

Categories and Features

Categories and Features

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