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What is Composer 1.5?

Composer 1.5 stands as the latest coding model from Cursor, designed to significantly boost both speed and analytical capabilities for routine programming tasks, boasting an impressive 20-fold enhancement in reinforcement learning compared to its predecessor, which results in superior performance when addressing real-world coding challenges. This innovative model operates as a "thinking model," producing internal reasoning tokens that aid in evaluating a user's codebase and planning future actions, which allows it to respond quickly to simple problems while engaging in deeper reasoning for more complex issues. Furthermore, it ensures interactivity and efficiency, making it perfectly suited for everyday development workflows. To manage lengthy tasks, Composer 1.5 incorporates a self-summarization feature that enables the model to distill information and maintain context when it reaches certain limits, thereby ensuring accuracy across various input lengths. Internal assessments reveal that Composer 1.5 surpasses its earlier version in coding tasks, particularly shining in its ability to handle intricate challenges, which enhances its applicability for interactive solutions within Cursor's platform. Not only does this advancement represent a leap forward in coding assistance technology, but it also promises to significantly enhance the overall development experience for users, making it a vital tool for modern programmers.

What is Claude Sonnet 5?

Claude Sonnet 5 is Anthropic’s most advanced frontier model, engineered for sustained reasoning and complex, multi-stage tasks. It is optimized for long-horizon coding, agentic systems, and intensive interaction with computers and software tools. Sonnet 5 achieves state-of-the-art performance on the SWE-bench Verified benchmark, reflecting its deep software engineering expertise. It also leads the OSWorld benchmark, which evaluates real-world computer use capabilities. One of its defining strengths is the ability to maintain focus and coherence for more than 30 hours on demanding workflows. The model introduces major improvements in tool execution, memory management, and large-context reasoning. These upgrades allow it to handle extended conversations, multi-agent coordination, and iterative problem solving. Sonnet 5 supports context editing and persistent memory tools to maintain continuity across sessions. It can also execute code and create files directly within Claude applications. The model demonstrates strong understanding across technical and professional domains, including law, finance, and science. Claude Sonnet 5 is deployed under AI Safety Level 3 standards. Built-in classifiers and safeguards reduce risks related to prompt injection and sensitive outputs.

Media

Media

No images available

Integrations Supported

Cursor
Biela.dev
Brokk
CLion
Claude
Claude Code
Cody
Doraverse
Elixir
Go
Google Antigravity
HTML
LaunchLemonade
Ruby
Scala
Snowflake Cortex AI
Thread Deck
Verdent
WebStorm
Xcode

Integrations Supported

Cursor
Biela.dev
Brokk
CLion
Claude
Claude Code
Cody
Doraverse
Elixir
Go
Google Antigravity
HTML
LaunchLemonade
Ruby
Scala
Snowflake Cortex AI
Thread Deck
Verdent
WebStorm
Xcode

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-1-5

Company Facts

Organization Name

Anthropic

Date Founded

2021

Company Location

United States

Company Website

claude.ai

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