Sonnet 5.5 Now Available in Base44 Model Picker
Base44Base44 made Sonnet 5.5 the Sonnet option in the model picker for both the AI chat and the agent editor. Users choosing a Sonnet model now get the newest version in both surfaces.
Key Takeaways
- Sonnet 5.5 is now the Sonnet option in Base44's model picker.
- The update applies to both the AI chat and the agent editor.
- Users selecting Sonnet get the newest model version without extra configuration.
- Model changes are among the most consequential updates for a vibe-coding platform.
- The change keeps the two building surfaces consistent.
- It was announced in Base44's product changelog on 2026-09-28.
Sonnet 5.5 in the model picker
Base44 updated its model picker so that Sonnet 5.5 is now the Sonnet option in both the AI chat and the agent editor. Anyone who selects Sonnet to build or edit an app now works with the newest model in that family, with no extra setup.
Why it matters
For a vibe-coding platform, the model behind the agent shapes the speed, cost and quality of every build. Having the latest Sonnet available in both the chat and the agent editor keeps the two surfaces consistent, so users do not have to pick different model versions depending on where they work.
Details on switching models are in Base44's documentation on choosing your model in the AI chat modes page.