OpenCode Integration

Status: Generally available. Audience: Operators wiring OpenCode to an OmniRoute deployment. Source of truth (config schema): src/shared/services/opencodeConfig.ts Source of truth (npm package): @omniroute/opencode-provider/ (publishable workspace)

OpenCode is an agentic CLI/desktop AI client. It reads its provider catalog from ~/.config/opencode/opencode.json (or opencode.jsonc) and follows the schema at https://opencode.ai/config.json. OmniRoute exposes itself to OpenCode as one of those providers — every request flows through OmniRoute’s standard OpenAI-compatible /v1 surface, so OpenCode automatically benefits from Auto-Combo routing, circuit breakers, key policies, observability, etc.

There are two supported integration paths. Pick one — they generate the same config.

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Path 1 — CLI generator (no npm install)

Recommended for end users. Ships with OmniRoute. Writes opencode.json in place.

# After installing OmniRoute (npm i -g @omniroute/cli or local clone)
omniroute config opencode \
  --base-url http://localhost:20128 \
  --api-key "$OMNIROUTE_API_KEY"

Behind the scenes the CLI calls mergeOpenCodeConfigText() (src/shared/services/opencodeConfig.ts:104), so an existing opencode.json keeps its other providers and comments. The OmniRoute entry is added/replaced atomically.

Resulting file (default model catalog):

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "omniroute": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "OmniRoute",
      "options": {
        "baseURL": "http://localhost:20128/v1",
        "apiKey": "<your-key>",
      },
      "models": {
        "claude-opus-4-5-thinking": { "name": "claude-opus-4-5-thinking" },
        "claude-sonnet-4-5-thinking": { "name": "claude-sonnet-4-5-thinking" },
        "gemini-3.1-pro-high": { "name": "gemini-3.1-pro-high" },
        "gemini-3-flash": { "name": "gemini-3-flash" },
      },
    },
  },
}

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Path 2 — npm package @omniroute/opencode-provider

Recommended when you’re scripting the config from Node/TS (CI pipelines, monorepos, custom installer flows).

npm install --save-dev @omniroute/opencode-provider

import { writeFileSync } from "node:fs";
import { buildOmniRouteOpenCodeConfig } from "@omniroute/opencode-provider";

const config = buildOmniRouteOpenCodeConfig({
  baseURL: "http://localhost:20128",
  apiKey: process.env.OMNIROUTE_API_KEY ?? "sk_omniroute",
  // Optional: override the model catalog exposed to OpenCode
  models: ["auto", "claude-opus-4-7", "gpt-5.5"],
  modelLabels: { auto: "Auto-Combo" },
});

writeFileSync("opencode.json", JSON.stringify(config, null, 2));

For a non-destructive merge against an existing file, replicate mergeOpenCodeConfigText() from opencodeConfig.ts or call the CLI generator.

See the package README for the full API.

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What the runtime actually does

Both paths produce the same provider.omniroute.npm: "@ai-sdk/openai-compatible". At runtime, OpenCode loads @ai-sdk/openai-compatible (already a transitive dependency of OpenCode) and configures it with baseURL + apiKey. From there:

OpenCode UI/agent
   → @ai-sdk/openai-compatible
      → HTTP POST {baseURL}/chat/completions          (OmniRoute OpenAI surface)
         → OmniRoute /v1/chat/completions handler     (open-sse/handlers/chatCore.ts)
            → combo routing / Auto-Combo / executor
               → upstream provider

The plugin never touches HTTP. It only emits configuration.

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Model catalog defaults

export const OMNIROUTE_DEFAULT_OPENCODE_MODELS = [
  "claude-opus-4-5-thinking",
  "claude-sonnet-4-5-thinking",
  "gemini-3.1-pro-high",
  "gemini-3-flash",
] as const;

You can override via models: [...]. Recommended additions:

• "auto" — surfaces OmniRoute’s Auto-Combo zero-config router. Lets OpenCode pick “the best available model” without you hard-coding the catalog.
• "<combo-name>" — any combo you’ve defined in the dashboard; OmniRoute resolves it transparently.

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URL normalisation

The helper accepts both forms and emits exactly one /v1:

Input	Output (options.baseURL)
http://localhost:20128	http://localhost:20128/v1
http://localhost:20128/	http://localhost:20128/v1
http://localhost:20128/v1	http://localhost:20128/v1
http://localhost:20128/v1///	http://localhost:20128/v1

This deduplication is the most common breakage seen in older configs. If you have an opencode.json from before v3.8.0 that points at /v1/v1/..., re-run the generator or call createOmniRouteProvider again.

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Authentication modes

OmniRoute setting	Recommended apiKey value
REQUIRE_API_KEY=false (default for local)	sk_omniroute (literal placeholder)
REQUIRE_API_KEY=true	A real per-user API key from Dashboard → API Keys.

For Anthropic-style clients that send x-api-key + anthropic-version, OmniRoute’s extractApiKey also honours the key from x-api-key. OpenCode uses the OpenAI surface, so it’ll always send Authorization: Bearer ${apiKey} — no Anthropic special-case applies here.

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Troubleshooting

Symptom	Cause	Fix
404 on every request with URL containing /v1/v1/	Stale config from pre-v3.8 plugin that double-suffixed /v1.	Regenerate via Path 1 or 2.
401 Invalid API key	OmniRoute has REQUIRE_API_KEY=true and the key is unknown.	Create the key in the dashboard, or set REQUIRE_API_KEY=false (local only) and use sk_omniroute.
Model list empty in OpenCode UI	All 4 default models are hidden in OmniRoute’s provider visibility.	Pass models: ["auto", ...] to surface ones you’ve enabled.
OpenCode 500 with cannot read property 'models'	Older OpenCode (< 0.1.x) didn’t accept inline models.	Upgrade OpenCode to a version that follows the v1 schema (opencode.ai/config.json).

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See also

• API reference — full OmniRoute REST surface
• Auto-Combo — what model: "auto" means
• @omniroute/opencode-provider README
• Source: src/shared/services/opencodeConfig.ts, src/lib/cli-helper/config-generator/opencode.ts, @omniroute/opencode-provider/src/index.ts

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OmniRoute source repository (a58000c7685f)