GPT5 reasoning effort in codex cli

[myhott163com]

Hey I wonder how can we set gpt 5 to high reasoning effort in codex cli? and how much reasoning juice we get (128 or 200)? Much thanks🫡

[GeorgeWingg]

we need gpt 5 pro in codex CLI ASAP!!!!!!!!!!!!!

[ben-z]

This worked for me:

codex --config 'model_reasoning_effort="high"'

> /status
...
🧠 Model
  • Name: gpt-5
  • Provider: OpenAI
  • Reasoning Effort: High
  • Reasoning Summaries: Auto
...

codex/codex-rs/protocol/src/config_types.rs

Line 10 in f9d3dde

pub enum ReasoningEffort {

[KLIEBHAN]

You can also set it in ~/.codex/config.toml:

...
model_reasoning_effort="high"
...