diff --git a/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx b/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
index 9494b81cb1..0709fb253e 100644
--- a/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
+++ b/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
@@ -21,6 +21,7 @@ import { Editor } from "@tui/util/editor"
 import { useExit } from "../../context/exit"
 import { Clipboard } from "../../util/clipboard"
 import type { FilePart } from "@opencode-ai/sdk/v2"
+import type { MessageV2 } from "@/session/message-v2"
 import { TuiEvent } from "../../event"
 import { iife } from "@/util/iife"
 import { Locale } from "@/util/locale"
@@ -171,6 +172,7 @@ export function Prompt(props: PromptProps) {
     extmarkToPartIndex: Map<number, number>
     interrupt: number
     placeholder: number
+    effort: MessageV2.Thinking["effort"]
   }>({
     placeholder: Math.floor(Math.random() * PLACEHOLDERS.length),
     prompt: {
@@ -180,6 +182,7 @@ export function Prompt(props: PromptProps) {
     mode: "normal",
     extmarkToPartIndex: new Map(),
     interrupt: 0,
+    effort: "default",
   })
 
   command.register(() => {
@@ -510,6 +513,7 @@ export function Prompt(props: PromptProps) {
         parts: [],
       })
       setStore("extmarkToPartIndex", new Map())
+      setStore("effort", "default")
     },
     submit() {
       submit()
@@ -841,6 +845,14 @@ export function Prompt(props: PromptProps) {
                     return
                   }
                 }
+                if (keybind.match("effort_cycle", e)) {
+                  e.preventDefault()
+                  const levels: MessageV2.Thinking["effort"][] = ["default", "medium", "high"]
+                  const currentIndex = levels.indexOf(store.effort)
+                  const nextIndex = (currentIndex + 1) % levels.length
+                  setStore("effort", levels[nextIndex])
+                  return
+                }
                 if (store.mode === "normal") autocomplete.onKeyDown(e)
                 if (!autocomplete.visible) {
                   if (
@@ -956,6 +968,12 @@ export function Prompt(props: PromptProps) {
                     {local.model.parsed().model}
                   </text>
                   <text fg={theme.textMuted}>{local.model.parsed().provider}</text>
+                  <Show when={store.effort !== "default"}>
+                    <text fg={theme.textMuted}>·</text>
+                    <text>
+                      <span style={{ fg: theme.warning, bold: true }}>{store.effort}</span>
+                    </text>
+                  </Show>
                 </box>
               </Show>
             </box>
diff --git a/packages/opencode/src/config/config.ts b/packages/opencode/src/config/config.ts
index 802c5db929..ff8a0cf4d4 100644
--- a/packages/opencode/src/config/config.ts
+++ b/packages/opencode/src/config/config.ts
@@ -478,6 +478,7 @@ export namespace Config {
       agent_list: z.string().optional().default("<leader>a").describe("List agents"),
       agent_cycle: z.string().optional().default("tab").describe("Next agent"),
       agent_cycle_reverse: z.string().optional().default("shift+tab").describe("Previous agent"),
+      effort_cycle: z.string().optional().default("ctrl+t").describe("Cycle thinking effort level"),
       input_clear: z.string().optional().default("ctrl+c").describe("Clear input field"),
       input_paste: z.string().optional().default("ctrl+v").describe("Paste from clipboard"),
       input_submit: z.string().optional().default("return").describe("Submit input"),
diff --git a/packages/opencode/src/provider/transform.ts b/packages/opencode/src/provider/transform.ts
index 7b1e2909ea..edfdf2bd6c 100644
--- a/packages/opencode/src/provider/transform.ts
+++ b/packages/opencode/src/provider/transform.ts
@@ -245,7 +245,7 @@ export namespace ProviderTransform {
   }
 
   export function thinking(model: Provider.Model, thinking: MessageV2.Thinking) {
-    if (!model.capabilities.reasoning) return undefined
+    if (!model.capabilities.reasoning || thinking.effort === "default") return undefined
 
     switch (model.api.npm) {
       case "@openrouter/ai-sdk-provider":
diff --git a/packages/opencode/src/session/message-v2.ts b/packages/opencode/src/session/message-v2.ts
index 11812d19a1..4349e75044 100644
--- a/packages/opencode/src/session/message-v2.ts
+++ b/packages/opencode/src/session/message-v2.ts
@@ -289,7 +289,7 @@ export namespace MessageV2 {
     sessionID: z.string(),
   })
 
-  export const Thinking = z.object({ effort: z.enum(["low", "medium", "high"]) })
+  export const Thinking = z.object({ effort: z.enum(["default", "medium", "high"]) })
   export type Thinking = z.infer<typeof Thinking>
 
   export const User = Base.extend({
diff --git a/packages/sdk/js/src/v2/gen/types.gen.ts b/packages/sdk/js/src/v2/gen/types.gen.ts
index 0e374c952d..c8016012f5 100644
--- a/packages/sdk/js/src/v2/gen/types.gen.ts
+++ b/packages/sdk/js/src/v2/gen/types.gen.ts
@@ -91,7 +91,7 @@ export type UserMessage = {
     [key: string]: boolean
   }
   thinking?: {
-    effort: "low" | "medium" | "high"
+    effort: "default" | "medium" | "high"
   }
 }
 
@@ -972,6 +972,10 @@ export type KeybindsConfig = {
    * Previous agent
    */
   agent_cycle_reverse?: string
+  /**
+   * Cycle thinking effort level
+   */
+  effort_cycle?: string
   /**
    * Clear input field
    */