Opus 4.5 as a core model

How it works

How Opus 4.5 as a core model works, drawn only from its official release notes.

1. 01

   What it does

   We upgraded Lovable’s Agent to incorporate Claude Opus 4.

2. 02

   Who gets it

   The source does not say which plans include it. Check your workspace before relying on it.

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 Opus 4.5 as a core model working in a real project rather than a sandbox.

   Set up Opus 4.5 as a core model in this project — we upgraded Lovable’s Agent to incorporate Claude Opus 4.5 for core parts, bringing major improvements to planning, design quality, and. 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

   Decide whether it fits your project

   Worth five minutes before you wire anything in. Opus 4.5 as a core model sits in Agent, and not every project needs it.

   I am building the project in this workspace. Given that Opus 4.5 as a core model we upgraded Lovable’s Agent to incorporate Claude Opus 4.5 for core parts, bringing major improvements to planning, design quality, and, tell me honestly whether it fits what I am building, including the cases where I should not use it. If it does fit, give me the single smallest first step.

   Expected outcome

   A direct yes or no with the reasoning, the cases against it, and one first step. Treat a hedged answer as a no.

3. 03

   Brief your team on it

   Someone has to explain the change to the people who will live with it. This produces that note.

   Write a short note for my team about Opus 4.5 as a core model in Lovable — we upgraded Lovable’s Agent to incorporate Claude Opus 4.5 for core parts, bringing major improvements to planning, design quality, and. Under 120 words: what it is, what changes for us, and what we should do about it this week. Plain language, no hype, no bullet padding.

   Expected outcome

   A note you can paste into chat as-is. Read it once for anything overstated before you send it.

Frequently asked

• What is Opus 4.5 as a core model?

  Opus 4.5 as a core model is Lovable's Agent feature: We upgraded Lovable’s Agent to incorporate Claude Opus 4.5 for core parts, bringing major improvements to planning, design quality, and acc…. We upgraded Lovable’s Agent to incorporate Claude Opus 4.5 for core parts, bringing major improvements to planning, design quality, and accuracy.

• Is Opus 4.5 as a core model GA or in beta?

  Opus 4.5 as a core model is generally available (GA) on Lovable.

• What Lovable plan includes Opus 4.5 as a core model?

  The atlas has not verified which Lovable plans include Opus 4.5 as a core model. Check Lovable's pricing page.

• When did Opus 4.5 as a core model launch?

  Opus 4.5 as a core model launched on Dec 10, 2025.