Branchline

Settings

Configure Branchline

Keep your API key, model choice, and reasoning preferences here so the main workspace stays focused on the conversation.

Stored locally in your browser so Branchline can call the OpenAI Responses API.

Choose the default model used for main chats and every branch.

Only applies to GPT-5 models that support reasoning effort.

Favorites

Saved snippets

Keep track of the passages you bookmarked from assistant replies and remove them here whenever you want.

Analyse

Analyse this excerpt

Describe the lens you want to use, then Branchline will highlight the parts of the selected passage that match it most strongly.

Try prompts like: hidden assumptions, emotional tone, contradictions, strongest evidence, or persuasive tactics.