Codex

Built-in name: codex
Default command: npx @zed-industries/codex-acp
Upstream: https://github.com/zed-industries/codex-acp
Runtime config options exposed by current codex-acp releases include mode, model, and reasoning_effort.
acpx --model <id> codex ... applies the requested model after session creation via session/set_config_option.
acpx codex set thought_level <value> is supported as a compatibility alias and is translated to codex-acp reasoning_effort.