diff --git a/.github/workflows/opencode-review.yml b/.github/workflows/opencode-review.yml
index 92c5bcc55..1e17bb067 100644
--- a/.github/workflows/opencode-review.yml
+++ b/.github/workflows/opencode-review.yml
@@ -2848,7 +2848,6 @@ jobs:
                 "mode": "primary",
                 "prompt": "{file:./ci-review-prompt.md}",
                 "steps": 100,
-                "reasoningEffort": "high",
                 "permission": {
                   "edit": "deny",
                   "bash": "allow",
@@ -2868,7 +2867,6 @@ jobs:
                 "mode": "primary",
                 "prompt": "{file:./ci-review-prompt.md}",
                 "steps": 150,
-                "reasoningEffort": "high",
                 "permission": {
                   "edit": "deny",
                   "bash": "allow",
@@ -2889,7 +2887,6 @@ jobs:
                 "prompt": "{file:./code-reviewer-prompt.md}",
                 "steps": 100,
                 "color": "#7c3aed",
-                "reasoningEffort": "high",
                 "permission": {
                   "edit": "deny",
                   "read": "allow",
diff --git a/opencode.jsonc b/opencode.jsonc
index 57362d048..13238d02f 100644
--- a/opencode.jsonc
+++ b/opencode.jsonc
@@ -56,7 +56,6 @@
       "mode": "primary",
       "prompt": "{file:./ci-review-prompt.md}",
       "steps": 4,
-      "reasoningEffort": "high",
       "permission": {
         "edit": "deny",
         "bash": "allow",
@@ -76,7 +75,6 @@
       "mode": "primary",
       "prompt": "{file:./ci-review-prompt.md}",
       "steps": 12,
-      "reasoningEffort": "high",
       "permission": {
         "edit": "deny",
         "bash": "allow",
@@ -97,7 +95,6 @@
       "prompt": "{file:./code-reviewer-prompt.md}",
       "steps": 16,
       "color": "#7c3aed",
-      "reasoningEffort": "high",
       "permission": {
         "edit": "deny",
         "read": "allow",
diff --git a/tests/test_opencode_agent_contract.py b/tests/test_opencode_agent_contract.py
index ce07fefc4..b259188b0 100644
--- a/tests/test_opencode_agent_contract.py
+++ b/tests/test_opencode_agent_contract.py
@@ -19,7 +19,12 @@ def test_code_reviewer_subagent_contract_is_configured():
     assert reviewer["prompt"] == "{file:./code-reviewer-prompt.md}"
     assert reviewer["steps"] == 16
     assert reviewer["color"] == "#7c3aed"
-    assert reviewer["reasoningEffort"] == "high"
+    # Reasoning effort is model-level only (see the model configs below and the
+    # ci-autofix agent). An agent-level reasoningEffort is applied to every
+    # candidate the agent runs, including non-reasoning models like
+    # github-models/openai/gpt-4.1, whose OpenAI backend rejects the
+    # reasoning_effort request argument outright.
+    assert "reasoningEffort" not in reviewer
     assert "model" not in reviewer
     assert "Reviews only; never edits code" in reviewer["description"]
 
@@ -36,7 +41,10 @@ def test_code_reviewer_subagent_contract_is_configured():
     assert permission["lsp"] == "deny"
 
     for primary_agent in ("ci-review", "ci-review-fallback"):
-        assert agents[primary_agent]["reasoningEffort"] == "high"
+        # Reasoning effort must NOT be set at the agent level: it would be sent
+        # to every pool candidate, and non-reasoning models (gpt-4.1) reject the
+        # reasoning_effort argument. Reasoning models carry it per-model instead.
+        assert "reasoningEffort" not in agents[primary_agent]
         permission = agents[primary_agent]["permission"]
         assert permission["bash"] == "allow"
         assert permission["task"] == "allow"