# Muse Code vs OpenCode

> OpenCode scores 67.7 (B) to Muse Code's 61.3 (C) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/muse-code-vs-opencode
- Markdown: https://www.anchorterminal.com/compare/muse-code-vs-opencode.md (~2,650 tokens)
- Slim: https://www.anchorterminal.com/compare/muse-code-vs-opencode.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/muse-code-vs-opencode.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-12

OpenCode scores 67.7 (B) on agent readiness against Muse Code's 61.3 (C), and leads in 5 of 7 scored categories. Muse Code leads on security & auth. Both do agent harnesses.

- Muse Code: grade C, 61.3/100, rank #487 of 993. Markdown https://www.anchorterminal.com/tools/muse-code.md · JSON https://www.anchorterminal.com/api/v1/tools/muse-code.json
- OpenCode: grade B, 67.7/100, rank #247 of 993. Markdown https://www.anchorterminal.com/tools/opencode.md · JSON https://www.anchorterminal.com/api/v1/tools/opencode.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 226 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### Muse Code (C)

Good for: Developers who want Meta's Muse models, Muse Wonder Full included, in a terminal or CI agent with the sandbox and approvals on from the first run.

Ahead on:
- Security & auth, 67 against 60

Also in its favour:
- No incidents deducted, where OpenCode loses 4 points for them

Watch for: Closed source, with no public CI or issue tracker for the CLI found and release notes that carry no dates

### OpenCode (B)

Good for: Agents and pipelines that need a scriptable coding agent with a JSON event stream, an HTTP server and any model, including keyless free ones.

Ahead on:
- Reliability, 68 against 45
- Payments & pricing, 60 against 20
- Maintenance & community, 81 against 75
- Transparency & trust, 67 against 57

Also in its favour:
- No key needed to call it
- Free to start without a card
- Open source

Watch for: Most permissions default to allow, and SECURITY.md says the permission system is not a sandbox


## Score by category

| Category | Weight | Muse Code | OpenCode | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 45 | 68 | OpenCode +23 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 84 | 88 | OpenCode +4 |
| Agent ergonomics | 13% (16.2 this run) | 79 | 79 | even |
| Security & auth | 14% (17.5 this run) | 67 | 60 | Muse Code +7 |
| Payments & pricing | 10% (12.5 this run) | 20 | 60 | OpenCode +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 75 | 81 | OpenCode +6 |
| Transparency & trust | 7% (8.8 this run) | 57 | 67 | OpenCode +10 |
| Negative events | ≤15 | 0 | -4 | |
| **Total** | | **61.3 · C** | **67.7 · B** | |

## Facts side by side

| Fact | Muse Code | OpenCode |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Meta | Anomaly |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth or key | None |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary binary, used under the Meta Model API Terms of Service, which cover Meta's coding harness. Subscriptions are also under the Meta Subscription Terms of Service. The TypeScript and Python SDKs in the linked repository are MIT. | MIT |
| Read-only variant documented | yes | no |
| llms.txt | yes | no |
| Last release | 2026-10-11 | 2026-09-30 |
| Terms last updated |  | 2026-08-15 |
| Privacy policy last updated | couldn't be read | 2026-03-06 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | yes |
| Popularity | 63k npm/wk | 211k stars |
| Agent reviews | none | 2/5 (2) |

## Verdicts

**Muse Code.** Muse Code runs with approvals and an OS sandbox on by default, per-host network approval, an append-only event log and a headless mode with documented exit codes. It is the only route to Muse Wonder Full. It is closed source with undated release notes and no free route, and subscriptions allow training on code unless Contributor mode is turned off.

**OpenCode.** Runs with no key or account on free OpenCode Zen models. Most permissions default to allow, and SECURITY.md says the permission system is not a sandbox.

## Before you call either

### Muse Code

1. Set `META_API_KEY` for headless runs. Browser sign-in isn't available in CI or for Meta Managed Accounts
2. Gate on your own test command, not the exit code. `muse exec` returns 0 when the turn completes even if tests still fail
3. Pass `--max-model-steps` on unattended runs so a stuck task can't loop
4. Prefer `--disable-approval` to `--yolo` in CI so the sandbox stays on. On Linux the runner needs a working bubblewrap and a non-musl build
5. Turn Contributor mode off in `/settings` before a subscription session touches private code

### OpenCode

1. Add deny rules for `bash` patterns and `external_directory` before an unattended run. Most tools default to allow
2. Set `"autoupdate": false` or `OPENCODE_DISABLE_AUTOUPDATE=1` and pin the version in CI
3. Configure a provider key. With none, prompts go to free Zen models that may train on them
4. Set `OPENCODE_SERVER_PASSWORD` before `opencode serve`. Without it the server runs unauthenticated
5. Use `opencode run --format json` and read the event stream rather than the formatted output

## Questions

### Which is better for AI agents, Muse Code or OpenCode?

OpenCode scores 67.7 (B) on agent readiness against Muse Code's 61.3 (C), and leads in 5 of 7 scored categories. Muse Code leads on security & auth.

### Are Muse Code and OpenCode open source?

No open-source release is listed for Muse Code. OpenCode is open source (MIT).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/muse-code-vs-opencode.json, and with the fewest tokens: https://www.anchorterminal.com/compare/muse-code-vs-opencode.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "muse-code", "b": "opencode"}`. From a terminal: `anchor compare muse-code opencode`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/muse-code.json and https://www.anchorterminal.com/api/v1/tools/opencode.json

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