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GPT Engineer is the original open-source CLI project created by Anton Osika. It evolved into gptengineer.app, which was later rebranded as Lovable — a commercial web-app builder now valued at $6.6B. GPT Engineer remains free and open-source as the experimental precursor, while Lovable is the polished commercial product.
The software is free (MIT license). Your only cost is API usage from whichever LLM provider you choose. Using GPT-4o typically costs a few cents per generation; local open-source models cost nothing beyond your hardware.
As of 2026, the repository remains active with community contributions, but primary development focus has shifted to Lovable. It's positioned as an experimental tool and learning resource rather than a production-grade code generator.
Yes. GPT Engineer supports open-source models like WizardCoder that run locally, so no code or prompts leave your network. This makes it suitable for defense, healthcare, and other privacy-sensitive environments.
Compare features, test the interface, and see if it fits your workflow.