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AI Models

Sonnet 4.5

GAAI ModelsReleased Oct 2025Plan not verifiedSource: docs.lovable.dev

Sonnet 4.5 is Lovable's AI Models feature: Anthropic’s latest model now helps power your builds on Lovable.

Anthropic’s latest model now helps power your builds on Lovable. Expect stronger reasoning, more consistent results, and better performance on multi‑step edits and structured data.

How it works

How Sonnet 4.5 works, drawn only from its official release notes.

  1. What it does

    Anthropic’s latest model now helps power your builds on Lovable.

  2. 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. Stand it up from scratch

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

    Set up Sonnet 4.5 in this project — anthropic’s latest model now helps power your builds on Lovable. 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. Decide whether it fits your project

    Worth five minutes before you wire anything in. Sonnet 4.5 sits in AI Models, and not every project needs it.

    I am building the project in this workspace. Given that Sonnet 4.5 anthropic’s latest model now helps power your builds on Lovable, 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. 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 Sonnet 4.5 in Lovable — anthropic’s latest model now helps power your builds on Lovable. 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.

Capabilities

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    Frequently asked

    • What is Sonnet 4.5?

      Sonnet 4.5 is Lovable's AI Models feature: Anthropic’s latest model now helps power your builds on Lovable. Anthropic’s latest model now helps power your builds on Lovable.

    • Is Sonnet 4.5 GA or in beta?

      Sonnet 4.5 is generally available (GA) on Lovable.

    • What Lovable plan includes Sonnet 4.5?

      The atlas has not verified which Lovable plans include Sonnet 4.5. Check Lovable's pricing page.

    • When did Sonnet 4.5 launch?

      Sonnet 4.5 launched on Oct 6, 2025.

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