Codeflash

About Codeflash

Codeflash automates Python performance engineering, which is normally the most senior and least scalable kind of code review a team can ask for. Its agent generates candidate rewrites of a function, benchmarks each one against the original, and — critically — verifies that the fast version still returns the same results before proposing it. That verification step is what separates it from a general coding assistant asked to 'make this faster': the optimisation is only surfaced if behaviour is provably unchanged under the benchmark harness. Optimisations arrive as reviewable suggestions rather than silent rewrites, and the free tier is deliberately scoped to public GitHub projects with local tracing so open-source maintainers can use it without a contract. The paid product adds private repositories, deeper optimisation classes, developer code-quality metrics, and a dashboard showing where the wins accumulated. Codeflash also sells the outcome rather than the tool for larger teams: the company pairs the agent with its own performance engineers who review and ship every change, and publishes case-study numbers including a claimed 90% infrastructure cost reduction and 9.2× pod density at one customer. Data posture is spelled out per tier — the free plan permits AI training on your code, while both paid tiers carry a zero-data-retention policy and no training, ever.

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