Fork / Branch Session

Split a conversation in two. Forking copies a session's history up to a chosen point into a fresh session, so you can explore an alternative without disturbing the original thread.

It's each agent's own command — /branch in Claude Code, /fork in Codex and OpenCode. The key difference is that the fork lands on a new tab, or split view — both threads stay live, so you can chase different directions in parallel.

See also

• History — where forks are stored and resumed.
• Monitor Tasks — keep an eye on both threads running in parallel.