Claude Sonnet 4.5

Example workflows

Starting points built from this record, not transcripts of a run. Each prompt is written the way it should be sent, as one paragraph, and each is worth editing before you send it.

1. 01

   Stand it up from scratch

   You have read the record and want Claude Sonnet 4.5 working in a real project rather than a sandbox.

   Set up Claude Sonnet 4.5 in this project — sonnet 4.5 model support for faster, cheaper builds. Walk it end to end, tell me exactly what you changed, and flag anything I have to switch on myself before it works.

   Expected outcome

   A working setup, a plain list of what changed, and a short list of anything left for you to switch on. Check that list before assuming it is done.

2. 02

   Everyday agent prompts

   The record lists this as one of the jobs Claude Sonnet 4.5 is meant for, so it is a fair first test of whether it fits your app.

   In this project, use Claude Sonnet 4.5 for everyday agent prompts. Build the smallest version that a real user could complete end to end, keep the change scoped to that path, and tell me how to test it myself.

   Expected outcome

   One complete path a user can walk, the files and settings that changed, and the steps to test it. Walk it yourself before you ship it.

3. 03

   Review it before you publish

   Claude Sonnet 4.5 is wired in and you are about to put it in front of people. This is the pass that catches the half-configured version.

   Review how this project uses Claude Sonnet 4.5 before I publish. Check balanced cost and quality, list anything that is missing, misconfigured, or only half wired, fix what is safe to fix, and tell me what you left alone and why.

   Expected outcome

   A findings list split into what was fixed and what was left, with a reason for each. Anything left alone is yours to decide on.

Frequently asked

• What is Claude Sonnet 4.5?

  Claude Sonnet 4.5 is Lovable's AI Models feature: Sonnet 4.5 model support for faster, cheaper builds. Sonnet 4.5 support was added alongside the Lovable Cloud launch on Oct 6, 2025 as a balanced cost/quality option.

• Is Claude Sonnet 4.5 GA or in beta?

  Claude Sonnet 4.5 is generally available (GA) on Lovable.

• What Lovable plan includes Claude Sonnet 4.5?

  Claude Sonnet 4.5 is available on Lovable's Paid plans plan.

• When did Claude Sonnet 4.5 launch?

  Claude Sonnet 4.5 launched on Oct 6, 2025.

• Lovable AI GatewaySame category, also GA · Sep 2025
• Claude Opus 4.5 Early Access in Chat ModeSame category, also GA · Nov 2025
• Gemini 3 ProSame category, also GA · Nov 2025