diff --git a/opencode.jsonc b/opencode.jsonc
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+++ b/opencode.jsonc
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+{
+  "$schema": "https://opencode.ai/config.json",
+  // Model split for cc-ci agent runs (operator decision 2026-08-04):
+  // - The MAIN driving session (upgrader/orchestrator/report) stays on glm-5.2 —
+  //   set via --model at launch (launch-upgrader.py / launch-report.py tier config).
+  // - Every SUBAGENT (the built-in `general` agent used by the task tool) runs on
+  //   DeepSeek V4 Pro via OpenCode ZEN: ~3-5x cheaper per token than glm-5.2 with
+  //   near-free cache hits, which is where the weekly run burns most of its budget.
+  // Project-scoped: applies to opencode sessions started in this directory tree.
+  "agent": {
+    "general": {
+      "model": "opencode/deepseek-v4-pro"
+    }
+  }
+}