[Bug] Background jobs and subagents force GPT-5 Nano even when small_model is set to gpt-5.4 and opencode provider is disabled #24812

Description

Describe the bug

Even though I have:

• Disabled the opencode (and opencode-zen) provider
• Set both "model" and "small_model" to openai/gpt-5.4
• Explicitly configured multiple agents (build, plan, task, code-reviewer, analyze) to use openai/gpt-5.4

OpenCode still uses GPT-5 Nano for subagents / background jobs (especially those triggered by the oh-my-openagent plugin).

In the screenshot, you can see:

Explore · GPT-5 Nano · 10:09 PM

This happens with the internal initiator: <!-- OMO_INTERNAL_INITIATOR -->

Steps to reproduce

1. Use the following config (or very similar):

{
  "$schema": "https://opencode.ai/config.json",
  "disabled_providers": ["opencode"],
  "enabled_providers": ["openai"],
  "model": "openai/gpt-5.4",
  "small_model": "openai/gpt-5.4",
  "plugin": ["oh-my-openagent", "true-mem"],
  "provider": {
    "openai": { ... }
  },
  "agent": {
    "task": { "model": "openai/gpt-5.4", "mode": "subagent" },
    "build": { "model": "openai/gpt-5.4" },
    "plan": { "model": "openai/gpt-5.4" },
    ...
  }
}

2. Trigger any action that spawns a subagent (especially via oh-my-openagent — Explore, analyze, etc.).
3. Observe that subagent/background task still runs on GPT-5 Nano.

Expected behavior

All agents, subagents, and background/lightweight tasks should respect the configured model / small_model and never fall back to GPT-5 Nano when that provider is disabled and a different model is explicitly set.

Actual behavior

Subagents (particularly those started by OMO_INTERNAL_INITIATOR) ignore the config and default to GPT-5 Nano.

Environment

• OpenCode version: lastest version
• OS: Windows
• Plugin: oh-my-openagent, true-mem
• Provider: OpenAI

Additional context

This seems to be a regression or hard-coded fallback inside the subagent / internal initiator logic, bypassing user configuration for small_model and disabled providers.

It forces usage of a model I explicitly do not want (and have disabled the provider for).

Plugins

oh-my-openagent, true-mem

OpenCode version

lastest

Steps to reproduce

No response

Screenshot and/or share link

Operating System

Windows 11

Terminal

No response