AI Assistant
4 products ranked by how much of their useful core an AI coding agent can realistically reproduce.
Admix
A local chat UI with side-by-side replies is a contained project when it calls OpenRouter, but Admix's value depends on access to many hosted models, a current catalog, provider routing, and a maintained account and billing layer. You can reproduce the comparison workflow. You cannot reproduce the model access and service layer for a flat $10 subscription.
ChatGPT
You can build a chat UI over APIs, but you cannot solo-recreate the model, multimodal stack, tools, memory/product layer, safety systems, and scale.
Claude
A Claude-like UI is trivial; the model, safety/reliability layer, long-context performance, artifacts/projects, and platform distribution are not.
Google Gemini
A chat UI is easy, but Gemini's model access, Google ecosystem integration, multimodality, storage tie-ins, and platform distribution are not solo-buildable.