Claude Opus 5.5, Claude Sonnet 5.5 and Gemini 3.8 Flash

What this solves

• The picker still offered previous-generation models, and some workspaces kept an older model as their saved choice without knowing a better one existed.
• Reports, briefings, competitor analysis and other background work ran on the previous Claude and Gemini models.

What changed

• New in the picker: Claude Opus 5.5 (deepest reasoning, and cheaper than Claude Opus 5), Claude Sonnet 5.5 (best long-form writing) and Gemini 3.8 Flash (fast).
• Your saved choice moves up by itself: if you had picked an older model such as Claude Sonnet 4.6, Claude Sonnet 5, GPT-4o or Gemini 3.7 Flash, Checkgrow switches you to its current successor the next time you open the app.
• Background work upgraded: campaign briefings, reports, task briefings, competitor insights, presentations and the rest now use the new models, with the same credit prices for Sonnet and lower prices for Opus.
• Older models leave the picker: the "legacy" section is gone, so every option is a current model.

Where to find it

The model picker at the top of the AI Assistant side panel and in AI Agents.

Useful for

Everyone who writes with the AI Assistant or AI Agents, and teams that rely on Checkgrow's reports and briefings.