↓ Skip to main content
tomrochette.com
  1. Agents/
  2. Surfaces/

OpenChamber

Author
glm-5.3, glm-5.3-flash
History / Edit / PDF / EPUB / MD
Created: / Updated: / Status: finished / Readability: 3 / 5 minutes read (~969 words)
agent-curated 303 agentic-development-environments 1 fully-ai-generated 401 llm=glm-5.3 170 llm=glm-5.3-flash 314 open-source 79 opencode 8 research-note 273 surfaces 14
Table of Contents

OpenChamber is a free, MIT-licensed agentic development environment built around the OpenCode SDK: desktop, browser, mobile, and a VS Code extension for steering parallel agent sessions.

OpenChamber is the open-source answer to “where do I run my many OpenCode sessions”, and its differentiator is not polish but the fact that the whole surface, worktrees, chat, terminals, scheduling, is code you can read and fix.

What it is
#

A session cockpit, not an editor: parallel sessions each get their own worktree and branch, with chat, files, and terminals in one window. Session Goals let an agent keep working toward a finish line with the app closed; Multi-run and Fusion send one task across several models in parallel (v1.21.1 lifted the five-model cap) and keep or fuse the best results; scheduled work runs prompts on cron; and sessions start from GitHub issues or PRs and merge without leaving the app. Remote access works through a password-gated browser UI, Cloudflare tunnels, or an end-to-end-encrypted Private Relay pairing with no open ports. It runs on the OpenCode SDK today and is an independent project, not affiliated with the OpenCode team.

Status
#

Very active. About 11,000 stars (11,046) and 1,213 forks as of 2026-10-03, with v2.1.0 (October 1, 2026, cross-conversation message search over every session with the index kept on-machine, background commands and subagents that stay visible with live logs while they run, and a rebuilt file editor with changed-line markers, folding, multi-cursor, and a symbol outline) now the latest release after v2.0.4 (September 28, enterprise mode for teams that an administrator turns on with a policy file or OPENCHAMBER_ENTERPRISE_MODE=1, keeping conversations with the configured providers, locking provider management to config, and restricting extensions to administrator-approved repositories, plus goal checking, an Excalidraw extension, a Dutch interface, and Jev off by default), the v2.0.3 to v2.0.4 pair of September 28 (per-session permission modes of ask, safety net, or accept all, an In work session section, multi-run from the composer, a token-stats page, and provider cards), the v2.0.0 GA of the app on OpenCode 2 (September 23), the v1.24 line just below it (v1.24.2 of September 18 ending it), and commits landing October 3, 2026. A 190-point Hacker News thread in August 2026 marks its arrival in general awareness.

Strengths
#

  • Parallel sessions with automatic worktree management is the core loop, and the feature set around it (goals, multi-model fusion, cron scheduling) is built for exactly that workload.
  • Privacy is inspectable: nothing collected, code stays local, and the policy is visible in the source rather than a document.
  • Free and MIT with donation funding; no subscription cliff anywhere.
  • Every device surface (desktop, browser, phone, VS Code) drives the same sessions.

Cautions
#

  • It is one harness deep: OpenCode SDK today, so your harness choice is made for you.
  • The built-in editor was serviceable, not good; v2.1.0’s rebuilt editor (changed-line markers, folding, multi-cursor, symbol outline) narrows the gap, but heavy users may still keep a separate editor open for diff review.
  • The reliability record has rough chapters documented in detail in the corpus: chat blocking during worktree creation, terminal sessions closing on their own, and a weak @ file matcher.
  • A young project moving fast; expect regressions between releases.

Pricing
#

Free, open source, MIT. Donations via Patreon fund development; there is no paid tier, as of 2026-09-22.

Compared to
#

  • Antigravity: Google’s free multi-agent command center; closed client versus open code.
  • Cursor: the editor-first platform; OpenChamber is sessions-first and harness-agnostic only in the OpenCode direction.
  • VS Code + Copilot: the default surface; OpenChamber is for people whose problem is parallelism, not editing.

Bottom line
#

Recommended for engineers juggling multiple OpenCode sessions against shared repositories who want to own their surface. Not for anyone who wants a polished IDE experience or harness choice beyond OpenCode.

Changes
#

  • 2026-08-24 - Created among the five Surfaces notes after the owner-named OpenChamber verified real and Antimatter did not exist.
  • 2026-09-16 - Recorded v1.23.2 (September 14, faster startup and session browsing) as the latest release and refreshed stars to 9,908.
  • 2026-09-18 - Recorded v1.24.0 (third-party extensions, themes) and v1.24.1 as the latest releases, stars past 10,000, and the v2-preview test line on OpenCode v2.
  • 2026-09-20 - Recorded v1.24.2 (startup and reconnect memory fixes, session waiting indicators) as the latest release and refreshed stars to 10,100.
  • 2026-09-24 - Recorded the v2.0 GA: v2.0.0 shipped September 23 (“OpenCode 2 and instant settings”, promoting the v2-preview line) and v2.0.1 followed September 24 as the new latest release; stars refreshed to 10,509 and forks to 1,154.
  • 2026-09-26 - Recorded v2.0.2 (September 26, cleaner chat timeline rendering plus startup, worktree-config, and mobile relay fixes) as the new latest release and refreshed stars to 10,622.
  • 2026-09-27 - Linked the Agentic Development Environment Landscape tracker, whose OpenCode-native section is OpenChamber.
  • 2026-09-29 - Recorded v2.0.3 and v2.0.4 (both September 28, per-session permission modes, In work sessions, composer multi-run, and enterprise mode for teams) as the new latest releases and refreshed stars to 10,897.
  • 2026-10-02 - Recorded v2.1.0 (October 1, cross-conversation message search, visible background commands and subagents, a rebuilt file editor) as the new latest release and refreshed stars to 11,008.

See also
#

References
#