v4.16.1 3.3.1
labring/FastGPTAug 21, 2026 → Aug 21, 20261 day between releases
What's New
DSPy interpreter managed runtime and sandbox hardening added in 3.3.1, contrasting with v4.16.1's schema migration.
Breaking Changes
- Deprecation of `dspy.CodeAct` and `dspy.ProgramOfThought` (scheduled for removal in 3.5)
- `max_reflection_cost` now raises an error in DSPy's GEPA adapter
New Features
- Managed runtime for PythonInterpreter
- Callback API for lifecycle events
- GEPA multi-proposal sampling and selection strategies
- MCP structured result mode
- Improved adapter fallbacks for missing fields
Improvements
- Hardened sandbox isolation and execution integrity
- Faster Multi-Proposal GEPA Optimization
- Improved structured adapter outputs
- Enhanced MCP compatibility
Bug Fixes
- Interpreter execution fixes
- Sandbox diagnostics desynchronization fix
- Recursive execution rejection fix
Upgrade Notes
Install optional managed runtime using `pip install "dspy[deno]"`. Update code to handle the deprecation of `dspy.CodeAct` and `dspy.ProgramOfThought` and ensure `max_reflection_cost` is handled correctly in the GEPA adapter.
The Two Releases
v4.16.1
Aug 21, 2026· 2 months ago
A patch release following v4.16.0, focusing on refining Agent Sandbox configuration (supporting root images and custom APT sources) and migrating tool JSON Schema storage to string format.
Full release notes3.3.1
Aug 21, 2026· 2 months ago
A maintenance release focused on interpreter fixes, sandbox isolation hardening, and observability. It includes faster multi-proposal GEPA optimization, improved adapter correctness, and enhanced MCP compatibility.
Full release notes