# Claude Opus 5.5 and GPT 6 for your apps

By Steven Van · 2026-09-22

Base44 apps can now use Claude Opus 5.5, GPT 6 Sol and GPT 6 Luna, and existing model choices switch to the new equivalents automatically.

Apps built on [Base44](<https://creatorstoolbox.com/tools/base44>) can now run their in-app agents, InvokeLLM calls and AI gateway calls on Claude Opus 5.5, GPT 6 Sol and GPT 6 Luna, [according to the Base44 changelog](<https://docs.base44.com/changelog/product#september-22-2026>).

Anyone who had picked one of the models these replace is moved to the new equivalent automatically, and the app keeps working.

[![](<https://docs.base44.com/images/base44-docs-og.png>)](<https://docs.base44.com/changelog/product#september-22-2026>)

![Base44](<https://www.google.com/s2/favicons?domain=base44.com&sz=128>)

Base44

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[View Base44 →](<https://creatorstoolbox.com/tools/base44>)

[Original source](<https://docs.base44.com/changelog/product#september-22-2026>)

[Read Claude Opus 5.5 and GPT 6 for your apps on Creators Toolbox](<https://creatorstoolbox.com/blog/base44-claude-opus-5-5-and-gpt-6-for-your-apps>)

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Canonical source: https://creatorstoolbox.com/blog/base44-claude-opus-5-5-and-gpt-6-for-your-apps