3.4.0 v6.4.2
vercel/streamdownSep 25, 2026 → Sep 25, 20261 day between releases
What's New
Writing plans skill optimized for speed, recording decisions instead of code transcripts
Breaking Changes
- Removed plan-document-reviewer-prompt.md
- Removed CLAUDE.md
New Features
- Leaner plan generation logic
- Self-review mechanism for plan length
- Reference to Interfaces block in plans
Improvements
- Faster plan generation (1/4 time, 1/3 tokens)
- Improved plan reader description
Bug Fixes
- Fixed model over-implementation in plan writing
- Removed obsolete prompt files
Upgrade Notes
Major version jump from 3.4.0 to 6.4.2. Ensure scripts do not reference the removed `plan-document-reviewer-prompt.md` or `CLAUDE.md` files.
The Two Releases
3.4.0
Sep 25, 2026· 27 days ago
DSPy 3.4.0 introduces Jev integration via TypeSafe with new decision types (Noul, Choice, Score), native LM engines replacing experimental types, and async ReActV2 support. It marks the LM transition release with deprecation warnings for legacy integrations.
Full release notesv6.4.2
Sep 25, 2026· 26 days ago
v6.4.2 improves the writing-plans skill by making plans leaner and faster. Plans now record decisions (signatures, assertions) rather than code transcripts, preventing models from over-implementing.
Full release notes