OpenCode v1.3.4: Effect Refactor & AI SDK v6

TL;DR

• Major Effect-based architecture refactor across core services (Session, Config, Plugin, Skill)
• AI SDK v6 support added; improved startup performance and Windows build fixes
• TUI improvements: model variant selection dialog, theme color fixes; Desktop: mobile keyboard handling, file tree defaults

New

• Prompt slot feature — new capability for flexible prompt management
• AI SDK v6 support — compatibility with latest OpenAI SDK version
• TUI plugins support — extend functionality via terminal UI plugins
• Single target plugin entrypoints — streamlined plugin architecture
• Model variant selection dialog — UI dialog for choosing model variants instead of cycling
• GPT system prompt — dedicated prompt for non-Codex GPT models

Improved

• Effect-based architecture refactor — Session, Config, Plugin, and Skill services now use Effect for better composability and error handling
• App startup performance — optimized initialization and reduced startup time
• Bash tool caching — adjusted descriptions to increase cache hit rates between projects
• Windows web UI bundle build — fixed build issues on Windows platform
• Mobile keyboard handling — layout viewport now resizes when mobile keyboard appears
• File tree defaults — closed by default with minimum width for cleaner UI
• Markdown streaming — reduced visual jank while responses stream in UI
• MCP transport handling — close connections on failure or timeout

Fixed

• Flaky plugin tests — removed unsupported mock.module in Bun test environment
• Nix embedded web-ui support — fixed semver build identifier handling
• GitLab auth — updated opencode-gitlab-auth to 2.0.1

Breaking Changes

• Workspace server and WorkspaceContext removed — routing architecture improved; verify custom workspace integrations
• Shell tool now defaults to collapsed state — adjust UI expectations if relying on expanded default

Update: npm install opencode@1.3.4 or check the release page for platform-specific downloads.

Source: OpenCode