Base44 Launches Custom AI Model Base1 for Coding

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Base44 launches custom AI model as vibe coding startups build defensibility

The short version

Base44, acquired by Wix for $80 million one year ago, is rolling out Base1, a custom LLM trained on tens of millions of real user interactions
The move reflects a broader trend: vibe coding startups are building proprietary models to reduce reliance on external LLMs and strengthen competitive positioning
Base44 has grown to over $100 million in annual recurring revenue since its acquisition, while rivals like Lovable have reached unicorn status with $500 million ARR

What happened

Base44, the Bay Area coding platform acquired by Wix one year ago, has begun rolling out Base1, its own proprietary large language model. The custom LLM was developed and trained on data from tens of millions of real user interactions and is designed to support users in creating applications using natural language. This move reflects a broader industry trend in which vibe coding startups are developing internal AI models to reduce dependency on external LLM providers.

Context

The vibe coding space has grown rapidly, with competing approaches to AI defensibility. Lovable, a Swedish startup that reached unicorn status in its Series A round last summer, has instead chosen to rely on external LLMs. Other players like Cursor have secured backing, while legal tech startup Harvey previously abandoned plans to train its own model. Wix's acquisition of Base44 positioned the platform to pursue vertical integration of AI capabilities.

Both sides

Bull

Building a custom model gives Base44 control over its product roadmap, reduces dependency on third-party pricing changes, and leverages proprietary training data from millions of user interactions—a potential competitive moat.

Bear

Developing and maintaining a custom LLM requires significant ongoing investment in compute and talent, while larger competitors like Claude Code and xAI-backed tools benefit from network effects and established brand trust.

In plain words

Base44 is a tool that helps people build apps by talking to an AI. Instead of borrowing AI from another company, Base44 built its own AI model (called Base1) trained specifically on how real people use their platform. This gives them more control, kind of like a restaurant making its own sauce instead of buying from a supplier.

What may happen

Internal Model Advantage

Base44's proprietary model, trained on tens of millions of real user interactions, could deliver superior app-building suggestions tailored to actual user workflows, potentially justifying premium positioning.

scenario - not a prediction

Competitive Commoditization

If external LLMs (Claude, GPT) continue to improve rapidly and become cheaper, the investment in a custom model may yield diminishing returns compared to simply integrating the latest third-party APIs.

scenario - not a prediction

Wix Integration Play

Base44's model could eventually become part of Wix's broader product suite, powering app-building and design features across Wix's larger no-code ecosystem.

scenario - not a prediction