QuantConnect Lean Enhances Testing for Deprecated Members

Open-source algorithmic trading engine QuantConnect Lean released version 18060, improving tests for deprecated API members by running them directly at their so

QuantConnect Lean — C#/Python Backtesting & Live Trading Engine · Release 18060: Test the retired members where they live · 2026-09-04

Open-source algorithmic trading engine QuantConnect Lean released version 18060. This update improves testing by running tests for deprecated API members directly at their source location. The Lean engine supports both C# and Python, providing an integrated environment from backtesting to live trading.

weltiq perspective: For weltiq users leveraging the QuantConnect Lean engine, enhanced stability testing for deprecated APIs improves compatibility and reliability of existing strategy code.

Release Notes Excerpt

Co-Authored-By: Claude Fable 5.1 noreply@anthropic.com Claude-Session: https://claude.ai/code/session_01MCUgFSo2atYSan5TEsvTcK

Source: https://github.com/QuantConnect/Lean/releases/tag/18060