We’ve rolled out Claude Sonnet 4.5, Anthropic’s most capable model yet. And, it’s now the default engine in Base44 so you’ll get these improvements automatically when you start building.

Sonnet 4.5 delivers major upgrades across reasoning, context length, and execution speed. It handles long-running tasks, multi-step workflows, and domain-specific logic (e.g. finance, research, cybersecurity, data analysis) with ease.

Feature highlights:
-Extended context for larger prompts and documents
-Improved accuracy and consistency in complex workflows
-Faster, cleaner outputs even from single prompts
-Optimized for specialized use cases, from spreadsheets to presentations