LangGraph SDK 0.4.12 fixes run stream rejoin and drops a priority setting
The point
LangChain released langgraph-sdk 0.4.12, with changes since sdk 0.4.11. This Python SDK release removes fairness_weight from PrioritySettings. It also fixes rejoining a run stream that closes before the run ends.
Why it matters
For builders using LangGraph priority settings or long run streams, the removed field and the stream fix change what to expect.
Key details
- Version langgraph-sdk 0.4.12, listed as release sdk-py 0.4.12 in PR 9569
- PrioritySettings no longer carries fairness_weight, in PR 9441
- A run stream that closes before the run ends can be rejoined, in PR 9554
Original ~1 min → 25 sec here Source: LangGraph Releases, Nov 3, 2026