diff --git a/.opencode/agent/test-max-thinking.md b/.opencode/agent/test-max-thinking.md
new file mode 100644
index 00000000000..0dc5e9ab6b2
--- /dev/null
+++ b/.opencode/agent/test-max-thinking.md
@@ -0,0 +1,9 @@
+---
+description: Test agent with max thinking.
+model: zai-coding-plan/glm-4.7
+variant: max
+---
+
+You are a test agent for GLM-4.7 with max thinking enabled.
+
+Your purpose is to test model variants in this codebase. Keep responses brief and direct.
diff --git a/.opencode/agent/test-no-thinking.md b/.opencode/agent/test-no-thinking.md
new file mode 100644
index 00000000000..7e7166cc9bc
--- /dev/null
+++ b/.opencode/agent/test-no-thinking.md
@@ -0,0 +1,9 @@
+---
+description: Test agent with no thinking.
+model: zai-coding-plan/glm-4.7
+variant: none
+---
+
+You are a test agent for GLM-4.7 with thinking disabled.
+
+Your purpose is to test model variants in this codebase. Keep responses brief and direct.
diff --git a/.opencode/remember.jsonc b/.opencode/remember.jsonc
new file mode 100644
index 00000000000..42d86610f85
--- /dev/null
+++ b/.opencode/remember.jsonc
@@ -0,0 +1,16 @@
+{
+  // Enable or disable the plugin
+  "enabled": true,
+  // Where to store memories: "global", "project", or "both"
+  // - "global": ~/.config/opencode/memory/memories.sqlite (shared across projects)
+  // - "project": .opencode/memory/memories.sqlite (project-specific)
+  // - "both": search both, save to project
+  "scope": "project",
+  // Memory injection settings
+  "inject": {
+    // Number of memories to inject after user messages (default: 5)
+    "count": 5,
+    // Score threshold for [important] vs [related] tag (default: 0.6)
+    "highThreshold": 0.6
+  }
+}
diff --git a/packages/app/src/context/local.tsx b/packages/app/src/context/local.tsx
index 43d47e1b1bc..0423186becb 100644
--- a/packages/app/src/context/local.tsx
+++ b/packages/app/src/context/local.tsx
@@ -300,7 +300,11 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
             const m = current()
             if (!m) return undefined
             const key = `${m.provider.id}/${m.id}`
-            return store.variant?.[key]
+            const a = agent.current()
+            return (
+              store.variant?.[key] ??
+              (a?.model && `${a.model.providerID}/${a.model.modelID}` === key ? a.variant : undefined)
+            )
           },
           list() {
             const m = current()
diff --git a/packages/opencode/src/agent/agent.ts b/packages/opencode/src/agent/agent.ts
index 2b44308f130..16d119f2f0e 100644
--- a/packages/opencode/src/agent/agent.ts
+++ b/packages/opencode/src/agent/agent.ts
@@ -29,6 +29,7 @@ export namespace Agent {
       topP: z.number().optional(),
       temperature: z.number().optional(),
       color: z.string().optional(),
+      variant: z.string().optional(),
       permission: PermissionNext.Ruleset,
       model: z
         .object({
@@ -217,6 +218,7 @@ export namespace Agent {
       item.topP = value.top_p ?? item.topP
       item.mode = value.mode ?? item.mode
       item.color = value.color ?? item.color
+      item.variant = value.variant ?? item.variant
       item.hidden = value.hidden ?? item.hidden
       item.name = value.name ?? item.name
       item.steps = value.steps ?? item.steps
diff --git a/packages/opencode/src/cli/cmd/debug/agent.ts b/packages/opencode/src/cli/cmd/debug/agent.ts
index d1236ff40bc..4877d948a62 100644
--- a/packages/opencode/src/cli/cmd/debug/agent.ts
+++ b/packages/opencode/src/cli/cmd/debug/agent.ts
@@ -126,6 +126,7 @@ async function createToolContext(agent: Agent.Info) {
     parentID: messageID,
     modelID: model.modelID,
     providerID: model.providerID,
+    variant: agent.variant,
     mode: "debug",
     agent: agent.name,
     path: {
diff --git a/packages/opencode/src/config/config.ts b/packages/opencode/src/config/config.ts
index 020e626cba8..8f51f362430 100644
--- a/packages/opencode/src/config/config.ts
+++ b/packages/opencode/src/config/config.ts
@@ -579,6 +579,7 @@ export namespace Config {
         .regex(/^#[0-9a-fA-F]{6}$/, "Invalid hex color format")
         .optional()
         .describe("Hex color code for the agent (e.g., #FF5733)"),
+      variant: z.string().optional().describe("Default model variant to use for this agent (e.g., 'high')"),
       steps: z
         .number()
         .int()
@@ -600,6 +601,7 @@ export namespace Config {
         "mode",
         "hidden",
         "color",
+        "variant",
         "steps",
         "maxSteps",
         "options",
@@ -630,10 +632,11 @@ export namespace Config {
       // Convert legacy maxSteps to steps
       const steps = agent.steps ?? agent.maxSteps
 
-      return { ...agent, options, permission, steps } as typeof agent & {
+      return { ...agent, options, permission, steps, variant: agent.variant } as typeof agent & {
         options?: Record<string, unknown>
         permission?: Permission
         steps?: number
+        variant?: string
       }
     })
     .meta({
diff --git a/packages/opencode/src/session/llm.ts b/packages/opencode/src/session/llm.ts
index 55c9c452473..f03ae005e7a 100644
--- a/packages/opencode/src/session/llm.ts
+++ b/packages/opencode/src/session/llm.ts
@@ -94,8 +94,14 @@ export namespace LLM {
       system.push(header, rest.join("\n"))
     }
 
-    const variant =
-      !input.small && input.model.variants && input.user.variant ? input.model.variants[input.user.variant] : {}
+    const selectedVariant = input.user.variant || input.agent.variant
+    const variant = !input.small && input.model.variants && selectedVariant ? input.model.variants[selectedVariant] : {}
+    l.info("variant selection", {
+      selectedVariant,
+      hasModelVariants: !!input.model.variants,
+      availableVariants: input.model.variants ? Object.keys(input.model.variants) : [],
+      variantOptions: variant,
+    })
     const base = input.small
       ? ProviderTransform.smallOptions(input.model)
       : ProviderTransform.options({
@@ -109,6 +115,7 @@ export namespace LLM {
       mergeDeep(input.agent.options),
       mergeDeep(variant),
     )
+    l.info("merged options", { options })
     if (isCodex) {
       options.instructions = SystemPrompt.instructions()
     }
@@ -121,6 +128,7 @@ export namespace LLM {
         model: input.model,
         provider,
         message: input.user,
+        variant: selectedVariant,
       },
       {
         temperature: input.model.capabilities.temperature
@@ -140,6 +148,7 @@ export namespace LLM {
         model: input.model,
         provider,
         message: input.user,
+        variant: selectedVariant,
       },
       {
         headers: {},
diff --git a/packages/opencode/src/session/message-v2.ts b/packages/opencode/src/session/message-v2.ts
index 83ca72addb1..162c94a3410 100644
--- a/packages/opencode/src/session/message-v2.ts
+++ b/packages/opencode/src/session/message-v2.ts
@@ -365,6 +365,7 @@ export namespace MessageV2 {
     parentID: z.string(),
     modelID: z.string(),
     providerID: z.string(),
+    variant: z.string().optional(),
     /**
      * @deprecated
      */
diff --git a/packages/opencode/src/session/prompt.ts b/packages/opencode/src/session/prompt.ts
index 8554b44a727..c935dd9981d 100644
--- a/packages/opencode/src/session/prompt.ts
+++ b/packages/opencode/src/session/prompt.ts
@@ -832,7 +832,7 @@ export namespace SessionPrompt {
       agent: agent.name,
       model: input.model ?? agent.model ?? (await lastModel(input.sessionID)),
       system: input.system,
-      variant: input.variant,
+      variant: input.variant ?? agent.variant,
     }
 
     const parts = await Promise.all(
diff --git a/packages/opencode/src/tool/task.ts b/packages/opencode/src/tool/task.ts
index c87add638aa..b98e14f4850 100644
--- a/packages/opencode/src/tool/task.ts
+++ b/packages/opencode/src/tool/task.ts
@@ -103,12 +103,14 @@ export const TaskTool = Tool.define("task", async (ctx) => {
         modelID: msg.info.modelID,
         providerID: msg.info.providerID,
       }
+      const variant = agent.variant ?? msg.info.variant
 
       ctx.metadata({
         title: params.description,
         metadata: {
           sessionId: session.id,
           model,
+          variant,
         },
       })
 
@@ -133,6 +135,7 @@ export const TaskTool = Tool.define("task", async (ctx) => {
             summary: Object.values(parts).sort((a, b) => a.id.localeCompare(b.id)),
             sessionId: session.id,
             model,
+            variant,
           },
         })
       })
@@ -151,6 +154,7 @@ export const TaskTool = Tool.define("task", async (ctx) => {
           modelID: model.modelID,
           providerID: model.providerID,
         },
+        variant,
         agent: agent.name,
         tools: {
           todowrite: false,
@@ -183,6 +187,7 @@ export const TaskTool = Tool.define("task", async (ctx) => {
           summary,
           sessionId: session.id,
           model,
+          variant,
         },
         output,
       }
diff --git a/packages/sdk/js/src/gen/types.gen.ts b/packages/sdk/js/src/gen/types.gen.ts
index ca13e5e93cf..85bd272e1bb 100644
--- a/packages/sdk/js/src/gen/types.gen.ts
+++ b/packages/sdk/js/src/gen/types.gen.ts
@@ -121,6 +121,7 @@ export type AssistantMessage = {
   parentID: string
   modelID: string
   providerID: string
+  variant?: string
   mode: string
   path: {
     cwd: string
@@ -990,6 +991,10 @@ export type AgentConfig = {
    * Hex color code for the agent (e.g., #FF5733)
    */
   color?: string
+  /**
+   * Default model variant to use for this agent (e.g., 'high')
+   */
+  variant?: string
   /**
    * Maximum number of agentic iterations before forcing text-only response
    */
@@ -1590,6 +1595,7 @@ export type Agent = {
   topP?: number
   temperature?: number
   color?: string
+  variant?: string
   permission: {
     edit: "ask" | "allow" | "deny"
     bash: {
diff --git a/packages/sdk/js/src/v2/gen/types.gen.ts b/packages/sdk/js/src/v2/gen/types.gen.ts
index 38a52b325ad..aecb606ec0d 100644
--- a/packages/sdk/js/src/v2/gen/types.gen.ts
+++ b/packages/sdk/js/src/v2/gen/types.gen.ts
@@ -179,6 +179,7 @@ export type AssistantMessage = {
   parentID: string
   modelID: string
   providerID: string
+  variant?: string
   mode: string
   agent: string
   path: {
@@ -1409,6 +1410,10 @@ export type AgentConfig = {
    * Hex color code for the agent (e.g., #FF5733)
    */
   color?: string
+  /**
+   * Default model variant to use for this agent (e.g., 'high')
+   */
+  variant?: string
   /**
    * Maximum number of agentic iterations before forcing text-only response
    */
@@ -2117,6 +2122,7 @@ export type Agent = {
   topP?: number
   temperature?: number
   color?: string
+  variant?: string
   permission: PermissionRuleset
   model?: {
     modelID: string