The operator stays on your PC. You choose the model.

Updated 2026-10-03

Operator versus model

BackBrain acts on your Windows PC. The model supplies reasoning. Your key is stored on the device; the model choice does not move the operator to a cloud browser.

Cloud choices

Bring a key for Azure OpenAI, OpenAI, Anthropic, Gemini, or Perplexity. That provider bills you, not BackBrain. No subscription is sold on this site and BackBrain adds no markup.

Local choices

Use Ollama, LM Studio, or a compatible endpoint. Local-only mode refuses cloud model calls instead of quietly switching. This mode is a setting, not the default.

Fallback and refusal

You can list fallback models. If a provider refuses a normal step, BackBrain can retry with less text, or you can switch model. It does not bypass a site’s security check.

Privacy and repeat work

Passwords and one-time codes stay on the PC and are not written into transcripts. Credential screens are not sent to a cloud model. Other task text can go to a model you chose. Local-only mode blocks cloud model calls; it is a setting, not the default.

Repeat work may need fewer calls. It can still need live reasoning.