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What is Composer 2.5?

Composer 2.5 is Cursor’s newest AI-powered coding model, designed to significantly improve software development productivity through stronger reasoning, enhanced collaboration, and better handling of complex engineering tasks. Compared to Composer 2, the new release delivers major gains in sustained coding performance, allowing developers to work on larger and more complicated projects with improved reliability. The model was trained using expanded compute resources, more advanced reinforcement learning environments, and additional optimization techniques focused on both intelligence and usability. Cursor also refined behavioral aspects of the AI, including communication style and effort calibration, to make interactions feel more natural and productive during real-world coding sessions. A major feature of Composer 2.5 is its targeted reinforcement learning system with textual feedback, which provides localized corrections during training when the model makes mistakes such as invalid tool calls or style violations. This approach helps the AI understand exactly where errors occur and improves its decision-making more effectively than broad reward signals alone. The company further strengthened the model by training it on 25 times more synthetic coding tasks than Composer 2, exposing it to a wider range of difficult engineering challenges and edge cases. These synthetic tasks included feature deletion exercises where the model had to reconstruct missing functionality in real codebases using automated tests as validation signals. During large-scale training, Composer 2.5 demonstrated advanced problem-solving capabilities by reverse-engineering cached data and decompiling Java bytecode to recover deleted APIs in synthetic environments. Cursor also implemented sophisticated distributed training systems such as Sharded Muon and dual mesh HSDP, allowing efficient optimization across extremely large AI models and infrastructure clusters.

What is Claude Mythos?

Claude Mythos Preview is a cutting-edge AI model that represents a significant breakthrough in cybersecurity capabilities and autonomous reasoning. It has shown the ability to independently discover and exploit zero-day vulnerabilities in a wide range of systems, including operating systems, browsers, and critical infrastructure software. The model can generate sophisticated exploit chains, combining multiple vulnerabilities to achieve outcomes such as remote code execution or full system control. It operates using agentic workflows, where it analyzes source code, tests hypotheses, and iteratively refines its findings without human guidance. Mythos Preview is also highly capable in reverse engineering, allowing it to analyze closed-source binaries and uncover hidden vulnerabilities. Compared to previous models, it demonstrates a substantial increase in both accuracy and success rate when developing real-world exploits. It can identify subtle and long-standing bugs that have gone unnoticed for years. The model is also effective at converting known vulnerabilities into working exploits rapidly, reducing the time between disclosure and potential attack. These capabilities highlight both the opportunities and risks associated with advanced AI in cybersecurity. As a result, efforts like Project Glasswing aim to use the model to strengthen global defenses. The model’s emergence signals a shift toward automated, large-scale vulnerability research. Overall, Claude Mythos Preview marks a transformative step in how AI can impact both offensive and defensive cybersecurity.

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Integrations Supported

C
C++
CSS
Dart
Go
Java
JavaScript
Lua
Objective-C
PHP
R
Scala
Swift
TypeScript

Integrations Supported

Claude Code
Claude Cowork
Claude Marketplace
Claude Max
Claude Research
Claude for Healthcare

API Availability

API Availability

Has API

Pricing Information

$0.50/M input
$0.50/M input and $2.50/M output tokens
Free Version

Pricing Information

Pricing not provided

Supported Platforms

SaaS
Windows
Mac
Linux

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Cursor

Date Founded

2022

Company Location

United States

Company Website

cursor.com

Company Facts

Organization Name

Anthropic

Date Founded

2021

Company Location

United States

Company Website

claude.ai

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

AI Reasoning Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

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