How Brex Used Claude AI to Write 80% of Its New Codebase

What happened

Brex used Anthropic’s AI model Claude to write 80% of a new software codebase. This collaboration helped Brex accelerate software development and improve automation in their financial services platform.

Why it matters

• Claude’s AI capabilities significantly reduce coding time, increasing development speed.
• The use of AI in financial software highlights growing trust in AI for complex, regulated industries.
• This partnership demonstrates how AI can transform core business operations like spend management.

Key facts

1. 1. Claude helped Brex write 80% of a new codebase.
2. 2. Brex began exploring AI models in 2023 before selecting Claude.
3. 3. Brex automates 75% of transactions with Claude, achieving 94% compliance rates.