provider: "Cannot find package '@opencode/ai'" for anthropic-compatible / openai-compatible responses packages #53842

Description

Custom providers/models that reference a documented @opencode/ai/providers/* package which is not part of the bundled package registry fail at model initialization:

Cannot initialize <provider>/<model>: Cannot find package '@opencode/ai' imported from B:\~BUN\root\chunk-x66j8jdp.js

Affected (100% reproducible on v2.0.24, Windows): @opencode/ai/providers/anthropic-compatible, @opencode/ai/providers/openai-compatible/responses, @opencode/ai/providers/openai-compatible-responses.
Not affected: @opencode/ai/providers/anthropic, @opencode/ai/providers/openai, @opencode/ai/providers/openai-compatible.

The modules exist in the npm package @opencode/[email protected] and their code is present in the compiled binary, so this looks like a resolution gap in the bundled registry used by Provider.loadPackage, not a missing package.

Plugins

none

OpenCode version

2.0.24

Steps to reproduce

1. In opencode.json, configure a custom provider (a model-level "package" override reproduces identically):

{
  "providers": {
    "acme": {
      "package": "@opencode/ai/providers/anthropic-compatible",
      "settings": {
        "baseURL": "https://gateway.example.com/anthropic/v1",
        "apiKey": "{env:ACME_KEY}"
      },
      "models": {
        "anthropic/claude-sonnet-4.5": { "name": "Claude" }
      }
    }
  }
}

2. Run opencode reload.
3. Run opencode run --model "acme/anthropic/claude-sonnet-4.5" "hello".

Screenshot and/or share link

N/A (CLI reproduction)

Operating System

Windows 10 (10.0.19045), x86_64

Terminal

Git Bash (MINGW64), TERM=xterm-256color

Additional context

From the compiled bundle, Provider.loadPackage first checks a static package-to-chunk map, then falls back:

let s = ED.get(i);
if (s) return importPackage(i, i, s);
let a = (() => {
  if (i.startsWith("file://") || i.startsWith("@opencode/ai/")) return i; // bare specifier
  try { return import.meta.resolve(i) } catch { return; }
})();
if (a) return importPackage(i, a); // import("@opencode/ai/...") fails in the compiled binary
// npm-install fallback below is unreachable for @opencode/ai/* because of the early return

• The static map has 52 entries and includes anthropic, openai, openai/chat, openai/responses, openai-compatible, but not anthropic-compatible or openai-compatible/responses.
• Other code in the same bundle explicitly references @opencode/ai/providers/anthropic-compatible (native-route check and credential mapping), so the registry appears to be missing entries.
• Placing @opencode/ai in the working directory or next to the executable does not help. Importing the module through a file:// URL loads it, but its own bare dependencies then fail, so only the bundled path works.

Possible fixes: add the missing subpaths to the bundled registry, or remove the @opencode/ai/ early-return so the npm install fallback can run. In dev/source runs the same config resolves normally, which is likely why this only shows up in release builds.