Codeflash

Free

Ship Blazing-Fast Python Code — Every Time.

FreeFree tier

Type

Open Source

Visit Website GitHub (40 stars)

About Codeflash

Codeflash is an autonomous performance engineer that continuously optimizes Python code. Its AI agent, codeflash-agent, runs 24/7 in parallel with full codebase visibility, discovering global optimizations that human engineers might miss. Every change is benchmarked faster, verified against existing and auto-generated tests, and delivered as a mergeable pull request. Codeflash specializes in ML performance (inference, training, data processing) and has delivered results such as 90% infra cost reduction, 5× faster inference, and 13.7× faster token decoding. It integrates with Claude Code, Cursor, and GitHub, ensuring new code starts optimal. Enterprise features include SOC 2 Type 2 compliance, no AI training on customer code, and on-premises deployment. Pricing starts with a free tier (25 function optimizations per month), with Pro ($20/user/month) and Enterprise (custom) plans available.

Key Features

Autonomous codeflash-agent runs 24/7 in parallel with whole codebase view

Finds global optimizations and superhuman optimizations humans might miss

Every change is benchmarked faster and proven correct against tests

Delivers mergeable PRs with benchmark numbers and rationale

Integrates with Claude Code, Cursor, and GitHub for continuous optimization

Specialized in ML performance: GPU optimization, custom CUDA kernels, algorithmic rewrites

Supports inference frameworks like vLLM and Hugging Face Diffusers

Enterprise security: SOC 2 Type 2, no AI training on customer code, on-premises deployment

Pros & Cons

Pros

Delivers substantial cost cuts (up to 90% infra reduction) with ROI guarantee
Verifies correctness of all optimizations using existing and auto-generated regression tests
Runs in a sandbox; code is never used to train models
Provides reviewable PRs with benchmark numbers attached
Supports continuous optimization to prevent performance decay over time
Proven in real-world cases (e.g., Unstructured, RF-DETR, vLLM)

Cons

Currently only optimizes Python code (no support for other languages yet)
Free tier limited to 25 function optimizations per month (requires credits for more)
Requires integration with GitHub and specific IDEs (Claude Code, Cursor) for full automation

Best For

Reducing cloud infrastructure costs (e.g., from $10K to $1.1K/month)Improving p99 latency, cold start times, and GPU utilizationOptimizing ML inference (segmentation models, token decoding, WAN encoding)Continuous performance regression prevention on every new PRCost reduction for AI-written code (found functions up to 446× slower than necessary)

FAQ

How is Codeflash different from other AI copilots?

Codeflash implements expert optimization workflows with deep instrumentation that understands code behavior and performance by executing it, generating high-quality, correct optimizations that can be automated for all new code.

How much faster can my code get?

Individual functions have sped up anywhere between 10% to 5000x. Codeflash has improved professional workflows (even manually optimized ones) by up to 35% end-to-end, often matching or exceeding an expert Python developer's rewrite.

Does Codeflash optimize any language other than Python?

Codeflash currently only optimizes performance for Python, although this might change in the future.