Claude Opus 5 is now available

By Steven Van · 2026-08-18

Choosing Opus 5 manually, instead of Auto mode, needs a Builder plan or higher, for both the AI chat and the Superagent.

Base44 has added Claude Opus 5 as a model option in both the AI chat and the Superagent's model picker. Base44 describes it as its most advanced reasoning model, suited to complex multi-step logic, intricate architecture decisions, and edge cases where the highest accuracy is needed. Picking a model by hand, rather than leaving it to Auto mode, requires the Builder plan or higher, as covered in the AI chat documentation.

The model menu open in the AI chat, listing the available models with AI Controls highlighted under Preferences

The model menu in the AI chat, listing available models including Opus 5

The model selector open below the prompt box on the Base44 homepage, showing Auto mode, Base 1, Sonnet 5, Opus 5, GPT-5.6 Terra, GPT-5.6 Sol, and Fable 5.1

The model picker on the homepage, listing Opus 5 among the available models

The model selector open in the app editor, showing Auto mode, Base 1, Sonnet 5, Opus 5, GPT-5.6 Terra, GPT-5.6 Sol, and Fable 5.1

The model picker in the app editor, listing Opus 5 among the available models

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