Agent Breaking Changes_

← OpenCode

OpenCode v1.18.26

2026-09-01 · official notes

Summary

• Claude 5 sessions now tolerate stale thinking blocks instead of failing after prompt or tool changes.
• Bedrock GPT-5.6 models now accept none reasoning effort.
• Bedrock reasoning and replay handling is more reliable. (@pengzh1)

Full notes

## Core

### Bugfixes

- Claude 5 sessions now tolerate stale thinking blocks instead of failing after prompt or tool changes.
- Bedrock GPT-5.6 models now accept `none` reasoning effort.
- Bedrock reasoning and replay handling is more reliable. (@pengzh1)
- Tool call timing now stays accurate when tools update their metadata while still running. (@bartlettroscoe)
- `apply_patch` no longer emits an empty move path in permission metadata. (@altendky)

### Improvements

- Azure CLI sign-in now asks for the resource name directly instead of querying Azure management APIs.

## Desktop

### Bugfixes

- Session renames now save reliably from the title editor and tab context menu.

**Thank you to 3 community contributors:**
- @altendky:
  - fix(opencode): omit empty apply patch move path (#45329)
- @pengzh1:
  - fix(core): bump @ai-sdk/amazon-bedrock to 4.0.166 for reasoning and replay fixes (#45520)
- @bartlettroscoe:
  - fix(core): Fix for incorrect time.start reset in tool call logging (#32574) (#32596)