What's New in v0.5.106

This incremental release brings model expansions and important stability improvements to Sim Studio's workflow platform.

New Features

• GPT-5.4 Model Support: Added model definitions for both GPT-5.4 and GPT-5.4-pro, enabling developers to leverage the latest language models within Sim workflows and agents.

Bug Fixes & Improvements

• Sentinel Execution: Fixed critical issues with condition execution when using subflow sentinels, including problems with snapshot highlighting and duplicate terminal logs.
• Client-Side Optimization: Improved snapshot handling by excluding sentinels from client-side activation detection, reducing unnecessary processing.
• Legacy Migration: Resolved legacy subblock ID migration issues and added CI checks to prevent future regressions.

Developer Action Items

• Update to v0.5.106 to access the new GPT-5.4 models in your workflow definitions
• If using subflow sentinels, verify workflow execution now correctly highlights snapshots and logs
• Review any workflows using legacy subblock IDs to ensure they're properly migrated