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Anthropic releases Claude Fable 5.2
Mythos 5.2 for vetted security and science teams
Tools
Claude Code tests a new Code Mode
Version 2.1.323 · experimental, opt-in
Written with AI assistance, reviewed by the ACN desk.
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ACN Daily Brief: Thursday, November 12, 2026
- Claude Code tests a new Code Mode
The quick hit
- Anthropic has added an experimental Code Mode to Claude Code version 2.1.323.
- In Code Mode, Claude writes JavaScript programs that call its tools.
- The mode is off by default, and organizations can switch it off for everyone.
Anthropic has added an experimental Code Mode to Claude Code, its coding agent. The feature is in version 2.1.323.
Claude Code works through tools. A tool can read a file or run a command. In Code Mode, Claude writes JavaScript programs that call those tools.
The mode is opt-in. It stays off unless a user turns it on. Organizations can switch it off for everyone, according to the Claude Code changelog.
The changelog labels the feature experimental. The GitHub release for v2.1.323 is dated November 12. The changelog entry carries the same date.
The tools themselves do not change. What changes is how Claude calls them: through JavaScript that it writes itself. Users who do not enable the mode will see no difference.
Sources
- Claude Code changelog · Nov 12, 2026
- GitHub release v2.1.323 · Nov 12, 2026
