Grok Build v1.0.39
Grok Build v1.0.39 was released on .
Summary
Grok Build 1.0.39 makes subagents easier to use by removing the need to pick a type when spawning them, and fixes a frustrating issue where your image attachments would disappear during compaction. We've also improved how the system handles temporary files and made error messa...
Release Context
- This was the 148th Grok Build release of 2026 tracked by Havoptic.
- It shipped 1 day after Grok Build v1.0.38 (September 19, 2026).
Shipped around the same time
Within 3 days of this release, other AI coding tools also shipped:
- Kiro CLI v2.24.0 (September 23, 2026)
- Cursor: Rollouts and Security Review (September 23, 2026)
- Factory Droid v0.226.0 (September 23, 2026)
- Devin 2026.09.23 (September 23, 2026)
- Cline v4.1.20 (September 22, 2026)
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Release Notes
Grok Build 1.0.39
- Subagents can always use the parent model, with that choice locked in when the session starts
- Earlier image attachments survive multiple compactions
- Subagent spawning no longer requires choosing a type
- The agent keeps helper scripts, logs, and PR drafts in the system temp directory instead of the repository
- MCP tools that receive the wrong JSON shape are automatically fixed when the mismatch is unambiguous
- Local worktree capture no longer refuses repositories that contain uninitialized submodules
- Memory captures no longer include opaque model reasoning blobs
- Idle timeouts show a clear message instead of raw internal text
- Images attached to the last user prompt survive compaction
- Custom agent profiles persist correctly across session resume and reload
- Subagent labels appear as "Subagent" instead of "General" in transcripts and the tasks pane
Other Recent Grok Build Releases
- v1.0.85 (November 13, 2026)
- v1.0.84 (November 12, 2026)
- v1.0.83 (November 11, 2026)
- v1.0.82 (November 11, 2026)
- v1.0.81 (November 11, 2026)
Upgrading from v1.0.39? See all 45 releases since.
All Grok Build releases · All AI coding tool releases on Havoptic