DISABLE_INTERLEAVED_THINKING

Updated October 13, 2026 by Alex Sorokoletov

DISABLE_INTERLEAVED_THINKING is a Claude Code environment variable: Interleaved thinking beta. Its release history is not tracked here. It is listed in the official reference.

Status	Present in v2.1.294
Category	Models and thinking
Official docs	Listed

How to set it

For one session, export it in the shell that starts Claude Code:

export DISABLE_INTERLEAVED_THINKING=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "DISABLE_INTERLEAVED_THINKING": "<value>"
  }
}

Related variables

CLAUDE_CODE_DISABLE_ADAPTIVE_THINKING: Disable adaptive thinking mode.
CLAUDE_CODE_DISABLE_THINKING: Completely disable extended thinking.
CLAUDE_CODE_DISABLE_FAST_MODE: Disable the /fast toggle that uses the same model with faster output.
CLAUDE_CODE_DISABLE_LEGACY_MODEL_REMAP
CLAUDE_CODE_DISABLE_MODEL_ACCESS_FALLBACK: Present in the v2.1.285 build and absent from that release's notes.
CLAUDE_CODE_DISABLE_UNKNOWN_MODEL_WINDOW_ENFORCEMENT
CLAUDE_CODE_THINKING_DISPLAY_UPDATES: Overrides whether Claude's in-progress thinking and connector text render during a turn.
DISABLE_PROMPT_CACHING_FABLE

Frequently asked questions

What does DISABLE_INTERLEAVED_THINKING do?

Interleaved thinking beta

Which Claude Code version has DISABLE_INTERLEAVED_THINKING?

Its release history is not tracked here.

How do I set DISABLE_INTERLEAVED_THINKING?

Export it before starting Claude Code (export DISABLE_INTERLEAVED_THINKING=value), or add it to the "env" object in ~/.claude/settings.json to apply it to every session.

All variables, searchable: Claude Code environment variables.