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[ARTICLE · art-28830] src=conductor.build ↗ pub= topic=large-language-models verified=true sentiment=↑ positive

Conductor 0.64.0: Claude Fable 5

Conductor 0.64.0 adds support for Anthropic's Claude Fable 5, its most powerful model, along with env file settings for agent environment variables. The update also includes fixes for blank screen reloads, model picker highlighting, and context window display.

read1 min views36 publishedJun 9, 2026

0.64.0

June 9, 2026# Claude Fable 5

Claude Fable 5

Claude Fable 5, Anthropic's newest and most powerful model, is now available in Conductor.

Give it a shot and let us know what you think!

Improvements

  • Added env file settings for agent environment variables from parsed env files at user, repository, and local repository scopes. Loaded variables appear in the environment variable list with env-file source indicators.

Fixes

  • Fixed an issue where re Conductor on a workspace page could show a blank screen.

New in 0.64.1

  • Fixed model picker row highlighting so only the selected model is marked as selected.
  • Fixed wheel scrolling in the dispatcher model picker.

New in 0.64.3

  • Fixed Claude Fable 5 sessions showing a 200k context window instead of 1M.
  • Added Ultracode effort to Claude Fable 5
source & further reading
conductor.build — original article Conductor 0.89.0: Sign in with ChatGPT Conductor 0.89.1: GPT-6.1 Sol Conductor 0.87.3: GPT-6 Sol and GPT-6 Luna
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