Codeflash
Codeflash is an AI-powered Python code optimization tool that automatically discovers and implements performance improvements while rigorously verifying code correctness through comprehensive testing.
https://www.codeflash.ai/?ref=producthunt
Product Information
Updated:Nov 18, 2025
What is Codeflash
Codeflash is a general-purpose optimizer for Python that helps developers improve their code's performance without sacrificing functionality or introducing bugs. It acts as an AI software engineer specialized in code optimization, integrating seamlessly into development workflows through GitHub Actions. The tool is currently being used by top engineering teams at companies like Pydantic, Roboflow, Langflow, and others to ensure their Python applications maintain peak performance as codebases evolve.
Key Features of Codeflash
Codeflash is an AI-powered Python code optimization tool that automatically identifies performance bottlenecks and suggests improvements while maintaining code correctness. It uses advanced LLMs to generate multiple optimization strategies, runs comprehensive testing including existing and generated regression tests, benchmarks performance gains, and delivers verified solutions as merge-ready pull requests through GitHub Actions integration.
AI-Powered Optimization Generation: Uses advanced LLMs to generate multiple optimization strategies including better algorithms, improved logic, and more efficient library usage
Comprehensive Testing & Verification: Runs existing tests plus generates new regression tests with LLMs and formal verification to guarantee identical behavior before suggesting changes
Continuous Optimization Workflow: Integrates with GitHub Actions to automatically analyze and optimize new code in every pull request, preventing slow code from reaching production
Performance Benchmarking: Thoroughly benchmarks optimized code versions to verify and quantify actual performance improvements before suggesting changes
Use Cases of Codeflash
AI Model Optimization: Improves performance of AI agents and models by optimizing logic and concurrency, achieving up to 25% faster object detection
Data Processing Pipeline Optimization: Optimizes pandas operations and data transformations for faster analytics and improved data processing workflows
Library Performance Enhancement: Helps optimize open-source libraries like Pydantic by improving recursive algorithms and core functionality patterns
Pros
Zero runtime overhead in production
Automated optimization process that saves developer time
Thorough verification process ensuring code correctness
Cons
Currently limited to Python language only
Works best with self-contained functions that have minimal side effects
How to Use Codeflash
Install Codeflash: Run 'pip install codeflash' to install the package
Initialize Codeflash: Run 'codeflash init' in your project directory to set up initial configuration
Configure Project: Add codeflash as a development dependency in your pyproject.toml file if using package managers like poetry or uv
Get API Key: Generate an API key from the Codeflash webapp using your GitHub account that has access to the repository you want to optimize
Install GitHub App: Install the Codeflash GitHub App on your repository to allow the codeflash-ai bot to open PRs and provide optimization suggestions
Set Up GitHub Actions: Configure GitHub Actions workflow to run Codeflash on every pull request by adding the provided yaml configuration to your repository
Optimize Individual Scripts: To optimize a specific script, replace 'python myscript.py' with 'codeflash optimize myscript.py'
Optimize Test Code: To optimize code called by pytest tests, use 'codeflash optimize' with your pytest command
Review Optimizations: When Codeflash finds optimizations, it will create pull requests with detailed explanations of changes, performance improvements, and correctness proofs for you to review
Merge Optimizations: Review the suggested optimizations and merge the pull requests if you're satisfied with the changes and performance improvements
Codeflash FAQs
Codeflash is a general purpose optimizer for Python that helps improve code performance while maintaining correctness. It uses advanced LLMs to generate multiple optimization ideas, tests them for correctness, and benchmarks them for performance.
Codeflash Video
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