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What is Reason?

Reason serves as an autonomous assistant in software engineering and AI coding, adept at handling real programming responsibilities such as examining codebases, troubleshooting problems, feature development, and outcome verification. It functions effortlessly across linked repositories, local systems, and cloud infrastructures, enabling developers to delegate tasks without interrupting their current workflows. This tool is proficient in navigating codebases, monitoring function calls, reproducing errors, modifying files, executing tests, and creating validated pull requests for human review. Additionally, its research capabilities provide well-supported insights with direct citations to specific lines and files, while its memory for repositories ensures knowledge retention for future sessions. Reason boosts productivity further by accommodating multiple subagents, establishing isolated workspaces, organizing work schedules, and automating both development and operational workflows. Teams can effectively link their repositories, manage access permissions, review code alterations, and evaluate builds, regression tests, and deployment confirmations before merging, which ultimately enhances the development process. Through its extensive set of features, Reason not only increases operational efficiency but also cultivates a cooperative atmosphere among developers, facilitating better teamwork and communication. As a result, development cycles are shortened, and the quality of software output is significantly improved.

What is Muse Code?

Muse Code is Meta’s terminal-based AI coding agent built to take on complex software engineering tasks across large repositories. The agent is powered by Muse Spark 1.2 and is designed to plan code changes, write implementation code, validate results, and support end-to-end developer workflows. Muse Code can coordinate multiple persistent subagents for each task, helping solve difficult problems faster and with less manual intervention. Its architecture uses a simple agent loop enhanced by async background agents that remain active for the full session instead of being spawned only for individual steps. These background agents reduce repeated information gathering, carry out next actions, and communicate back to the main agent when useful. Muse Code’s runtime uses a local event log where model calls, tool runs, approvals, and edits are continuously appended. This event log serves as a single source of truth, making the runtime replay-exact and restart-safe if a crash or interruption occurs. The design allows Muse Code to handle long-running development work without losing progress or context. Muse Code includes bundled skills such as /plan for approval-gated task planning, /grill for stress-testing plans, and /goal for working toward successful completion of a defined objective. Example workflows include interpreting a video input, understanding the requested output, and producing a rich software experience such as a vacation home marketing and booking page. By combining terminal execution, autonomous planning, persistent background agents, replay-safe runtime design, bundled skills, and Muse Spark 1.2 model support, Muse Code helps developers complete ambitious coding tasks with greater reliability.

Media

Media

Integrations Supported

Slack

Integrations Supported

Meta AI
Muse Glimmer
Muse Spark
Muse Spark 1.1
Muse Spark 1.2
Muse Spark 1.3
Muse Wonder
Muse Wonder Full

API Availability

API Availability

Has API

Pricing Information

Pricing not provided

Pricing Information

$1.25 per 1M tokens (input)
Standard pricing: $1.25 per million input tokens and $4.25 per million output tokens

Discounted "contributor" tier costing $0.10 per million input tokens and $0.20 per million output tokens for users who agree to share feedback to improve the AI.
Free Version

Supported Platforms

SaaS
Mac

Supported Platforms

Windows
Mac
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Reason

Date Founded

2026

Company Location

United States

Company Website

reasonmachines.com

Company Facts

Organization Name

Meta

Date Founded

2004

Company Location

United States

Company Website

meta.ai

Categories and Features

AI Coding Agents

Not specified

Categories and Features

AI Coding Agents

Not specified

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