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Bernstein vs OpenCode: quick decision guide
OpenCode CLI adapter.
Page built on 2026-08-16 from data/adapters-meta.json. Every claim below links to its primary source.
Install both
OpenCode
curl -fsSL https://opencode.ai/install | bash (fastest),Bernstein
pipx install bernsteinApache-2.0. Deterministic Python scheduler.
Feature matrix
| Capability | OpenCode | Bernstein |
|---|---|---|
| Install method | curl -fsSL https://opencode.ai/install | bash (fastest), | pipx install bernstein |
| License | Not recorded | Apache-2.0 |
| Authentication | Not recorded | Per-agent credential scoping (no shared key) |
| Multi-agent orchestration | One agent in a terminal | OpenCode plus 40+ other adapters in parallel worktrees |
| MCP support | Not measured | Yes |
| Parallel-safe in worktrees | Not measured | Yes (designed around git worktrees) |
| HMAC-chained audit log | No | Yes (RFC 2104 SHA-256 chain in .sdd/) |
| Deterministic scheduler | Not applicable (single-agent CLI) | Yes (Deterministic Python scheduler) |
Adapter source: src/bernstein/adapters/opencode.py | Upstream homepage: opencode.ai
Verifiable facts
The brief for this surface requires at least three facts that a reader can verify against a primary source. The list below is built from the bernstein adapter source and, when available, the upstream project's own pages.
- Bernstein ships a OpenCode adapter at src/bernstein/adapters/opencode.py that wraps the upstream CLI as one of 42 routable agents. [source: bernstein adapter source, as of 2026-08-16]
- Upstream install command, as recorded in the bernstein adapter, is "curl -fsSL https://opencode.ai/install | bash (fastest),". [source: upstream docs, as of 2026-08-16]
- Bernstein last verified its adapter against upstream OpenCode (anomalyco/opencode) 1.18.16 on 2026-08-12. [source: bernstein adapter source, as of 2026-08-12]
Where OpenCode fits in Bernstein
Bernstein registers OpenCode under the slug "opencode" and the registry name "opencode". The adapter source lives at src/bernstein/adapters/opencode.py in the bernstein repo and was last touched at build time 2026-08-16. The OpenCode adapter file is 143 lines and 4,726 bytes long, fingerprinted 545ede2b5a5813e6 (first 16 hex chars of SHA-256). Operators install OpenCode on a worker box with "curl -fsSL https://opencode.ai/install | bash (fastest)," before Bernstein routes any task to it. No upstream GitHub repository is recorded in the bernstein adapter for OpenCode; refer to the upstream vendor's documentation when auditing. The OpenCode project's homepage at opencode.ai is the primary source for upstream release notes. Bernstein last verified the OpenCode adapter against upstream OpenCode (anomalyco/opencode) 1.18.16 on 2026-08-12, recorded inline in the adapter source. Bernstein routes tasks to OpenCode when its pass rate on similar work clears the configured threshold, otherwise the deterministic Python scheduler picks a different adapter from the 40+ adapter catalog.
Adapter source excerpt
The module docstring of the OpenCode adapter, as it stands in the bernstein repo. Punctuation is normalised for the web; the wording is the author's. Length: 252 characters.
OpenCode CLI adapter. Last verified against upstream OpenCode (anomalyco/opencode) 1.18.16 on 2026-08-12. Install: ``curl -fsSL https://opencode.ai/install | bash`` (fastest), ``brew install anomalyco/tap/opencode``, or ``npm i -g opencode-ai@latest``.Adapter telemetry
| Registry name | opencode |
|---|---|
| Adapter class | OpenCode |
| Source file | src/bernstein/adapters/opencode.py |
| Source file size | 143 lines, 4,726 bytes |
| Source SHA-256 | 545ede2b5a5813e6d86daa18c0a9690bbac9d90365ca8510170a17ebc0b436ab |
| Category bucket | cli-family |
| Upstream repo | Not derivable from adapter source |
| Upstream homepage | opencode.ai |
| Last verified upstream | OpenCode (anomalyco/opencode) 1.18.16 on 2026-08-12 |
| Operator-curated overlay | No (programmatic page) |
When to pick which
Choose OpenCode
Reach for OpenCode when the work is a single thread that fits one agent: in a single-process terminal session, designed for single-instance use per repo. Auth model is configured per upstream docs. You skip the orchestrator round-trip and get the smallest possible surface between you and the model.
Choose Bernstein
Wrap OpenCode under Bernstein when the goal splits into parallel tasks, when you want an HMAC-chained audit log on every routing decision, or when a deterministic Python scheduler (no LLM picking who runs what) is a hard requirement.
FAQ
Does Bernstein replace OpenCode?
No. Bernstein wraps OpenCode as one of 40+ CLI adapters and routes tasks to it based on per-task pass-rate history. OpenCode keeps running unchanged; Bernstein decides when it gets work.
Can I run OpenCode alongside other agents in the same repo?
Yes. Each agent runs in its own git worktree under .sdd/worktrees/{session_id}, so file edits never collide. Bernstein merges results back to the trunk only after the configured quality gates (lint, types, tests) pass.
Is this comparison page handwritten?
No. The template is fixed; every fact and every link is pulled from the bernstein adapter source in the master branch and (when available) the upstream project's own pages. The data extractor lives at scripts/gen-compare-data.mjs. No LLM writes the prose.