From dbc7bfa3f36cc61a3f1a2015e47d71ae9dee5421 Mon Sep 17 00:00:00 2001
From: maria <maria@kuuro.net>
Date: Wed, 2 Sep 2026 20:27:42 -0400
Subject: [PATCH] fix(opencode): show Reasoning selector for OpenCode models
 (#9287)

Co-authored-by: maria-rcks <254055478+maria-rcks@users.noreply.github.com>
---
 .../src/provider/Layers/OpenCodeProvider.ts   | 36 +++++++++++++++++--
 .../src/components/chat/TraitsPicker.test.ts  |  2 +-
 apps/web/src/components/chat/TraitsPicker.tsx |  2 +-
 3 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/apps/server/src/provider/Layers/OpenCodeProvider.ts b/apps/server/src/provider/Layers/OpenCodeProvider.ts
index a094fe8601a2a899f73417bccb47fad65990eaa4..7f131a54b330c26f1010607917f5a7e6d118da18 100644
--- a/apps/server/src/provider/Layers/OpenCodeProvider.ts
+++ b/apps/server/src/provider/Layers/OpenCodeProvider.ts
@@ -171,7 +171,30 @@ function inferDefaultAgent(agents: ReadonlyArray<Agent>): string | undefined {
 }
 
 const DEFAULT_OPENCODE_MODEL_CAPABILITIES: ModelCapabilities = createModelCapabilities({
-  optionDescriptors: [],
+  optionDescriptors: [
+    {
+      id: "variant",
+      label: "Reasoning",
+      type: "select",
+      options: [
+        { id: "low", label: "Low" },
+        { id: "medium", label: "Medium", isDefault: true },
+        { id: "high", label: "High" },
+        { id: "xhigh", label: "Extra High" },
+      ],
+      currentValue: "medium",
+    },
+    {
+      id: "agent",
+      label: "Agent",
+      type: "select",
+      options: [
+        { id: "build", label: "Build", isDefault: true },
+        { id: "plan", label: "Plan" },
+      ],
+      currentValue: "build",
+    },
+  ],
 });
 
 function openCodeCapabilitiesForModel(input: {
@@ -179,7 +202,14 @@ function openCodeCapabilitiesForModel(input: {
   readonly model: ProviderListResponse["all"][number]["models"][string];
   readonly agents: ReadonlyArray<Agent>;
 }): ModelCapabilities {
-  const variantValues = Object.keys(input.model.variants ?? {});
+  const rawVariantValues = Object.keys(input.model.variants ?? {});
+  // When a model advertises no variants, synthesize the standard reasoning
+  // levels so the composer still offers a Reasoning selector (mirrors the
+  // Codex/Grok experience where reasoning is always configurable). The set
+  // covers the common OpenCode variant spectrum; `inferDefaultVariant`
+  // picks the provider-appropriate default (e.g. medium for openai/opencode).
+  const variantValues =
+    rawVariantValues.length > 0 ? rawVariantValues : ["low", "medium", "high", "xhigh"];
   const defaultVariant = inferDefaultVariant(input.providerID, variantValues);
   const variantOptions = variantValues.map((value) =>
     defaultVariant === value
@@ -201,7 +231,7 @@ function openCodeCapabilitiesForModel(input: {
         ? [
             {
               id: "variant",
-              label: "Variant",
+              label: "Reasoning",
               type: "select" as const,
               options: variantOptions,
               ...(defaultVariant ? { currentValue: defaultVariant } : {}),
diff --git a/apps/web/src/components/chat/TraitsPicker.test.ts b/apps/web/src/components/chat/TraitsPicker.test.ts
index 5e9a3cf88e232feec60992bb875acf3fc1aaa648..dbe97cdd54e0333e507ee184e93e9e8d5440c075 100644
--- a/apps/web/src/components/chat/TraitsPicker.test.ts
+++ b/apps/web/src/components/chat/TraitsPicker.test.ts
@@ -167,7 +167,7 @@ describe("buildUnavailableModelOptionDescriptors", () => {
     ).toEqual([
       {
         id: "variant",
-        label: "Variant",
+        label: "Reasoning",
         type: "select",
         options: [{ id: "max", label: "max" }],
         currentValue: "max",
diff --git a/apps/web/src/components/chat/TraitsPicker.tsx b/apps/web/src/components/chat/TraitsPicker.tsx
index 57a0a869918129cbbfdcf451f82c40092ba1542d..6f122deb7fa2ef524c31e3d501d38ec9cc505ef8 100644
--- a/apps/web/src/components/chat/TraitsPicker.tsx
+++ b/apps/web/src/components/chat/TraitsPicker.tsx
@@ -40,7 +40,7 @@ const SAVED_OPTION_LABELS: Readonly<Record<string, string>> = {
   agent: "Agent",
   effort: "Effort",
   reasoningEffort: "Reasoning effort",
-  variant: "Variant",
+  variant: "Reasoning",
 };
 
 function savedOptionLabel(id: string): string {
-- 
2.54.0