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 0709fb253e..b3a85cc932 100644
--- a/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
+++ b/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
@@ -166,13 +166,19 @@ export function Prompt(props: PromptProps) {
     if (!props.disabled) input.cursorColor = theme.text
   })
 
+  const lastUserMessage = createMemo(() => {
+    if (!props.sessionID) return undefined
+    const messages = sync.data.message[props.sessionID]
+    if (!messages) return undefined
+    return messages.findLast((m) => m.role === "user")
+  })
+
   const [store, setStore] = createStore<{
     prompt: PromptInfo
     mode: "normal" | "shell"
     extmarkToPartIndex: Map<number, number>
     interrupt: number
     placeholder: number
-    effort: MessageV2.Thinking["effort"]
   }>({
     placeholder: Math.floor(Math.random() * PLACEHOLDERS.length),
     prompt: {
@@ -182,7 +188,27 @@ export function Prompt(props: PromptProps) {
     mode: "normal",
     extmarkToPartIndex: new Map(),
     interrupt: 0,
-    effort: "default",
+  })
+
+  // Derive model, agent, and effort from last user message
+  createEffect(() => {
+    const msg = lastUserMessage()
+    if (!msg) return
+
+    // Set agent from last message
+    if (msg.agent) {
+      local.agent.set(msg.agent)
+    }
+
+    // Set model from last message
+    if (msg.model) {
+      local.model.set(msg.model)
+    }
+
+    // Set effort from last message
+    if (msg.thinking?.effort) {
+      local.effort.set(msg.thinking.effort)
+    }
   })
 
   command.register(() => {
@@ -513,7 +539,6 @@ export function Prompt(props: PromptProps) {
         parts: [],
       })
       setStore("extmarkToPartIndex", new Map())
-      setStore("effort", "default")
     },
     submit() {
       submit()
@@ -591,6 +616,8 @@ export function Prompt(props: PromptProps) {
         arguments: args.join(" "),
         agent: local.agent.current().name,
         model: `${selectedModel.providerID}/${selectedModel.modelID}`,
+        // TODO: allow reasoning to affect command invocations too
+        // thinking: { effort: store.effort },
         messageID,
       })
     } else {
@@ -600,6 +627,7 @@ export function Prompt(props: PromptProps) {
         messageID,
         agent: local.agent.current().name,
         model: selectedModel,
+        thinking: local.effort.current() !== "default" ? { effort: local.effort.current() } : undefined,
         parts: [
           {
             id: Identifier.ascending("part"),
@@ -847,10 +875,7 @@ export function Prompt(props: PromptProps) {
                 }
                 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])
+                  local.effort.cycle()
                   return
                 }
                 if (store.mode === "normal") autocomplete.onKeyDown(e)
@@ -968,10 +993,10 @@ export function Prompt(props: PromptProps) {
                     {local.model.parsed().model}
                   </text>
                   <text fg={theme.textMuted}>{local.model.parsed().provider}</text>
-                  <Show when={store.effort !== "default"}>
+                  <Show when={local.effort.current() !== "default"}>
                     <text fg={theme.textMuted}>·</text>
                     <text>
-                      <span style={{ fg: theme.warning, bold: true }}>{store.effort}</span>
+                      <span style={{ fg: theme.warning, bold: true }}>{local.effort.current()}</span>
                     </text>
                   </Show>
                 </box>
diff --git a/packages/opencode/src/cli/cmd/tui/context/local.tsx b/packages/opencode/src/cli/cmd/tui/context/local.tsx
index 55c04621ef..bd6ad56003 100644
--- a/packages/opencode/src/cli/cmd/tui/context/local.tsx
+++ b/packages/opencode/src/cli/cmd/tui/context/local.tsx
@@ -329,10 +329,34 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
       },
     }
 
+    const effort = iife(() => {
+      const [effortStore, setEffortStore] = createStore<{
+        current: "default" | "medium" | "high"
+      }>({
+        current: "default",
+      })
+
+      return {
+        current() {
+          return effortStore.current
+        },
+        set(value: "default" | "medium" | "high") {
+          setEffortStore("current", value)
+        },
+        cycle() {
+          const levels: Array<"default" | "medium" | "high"> = ["default", "medium", "high"]
+          const currentIndex = levels.indexOf(effortStore.current)
+          const nextIndex = (currentIndex + 1) % levels.length
+          setEffortStore("current", levels[nextIndex])
+        },
+      }
+    })
+
     const result = {
       model,
       agent,
       mcp,
+      effort,
     }
     return result
   },
diff --git a/packages/sdk/js/src/v2/gen/sdk.gen.ts b/packages/sdk/js/src/v2/gen/sdk.gen.ts
index 97bc92b866..49f71a7423 100644
--- a/packages/sdk/js/src/v2/gen/sdk.gen.ts
+++ b/packages/sdk/js/src/v2/gen/sdk.gen.ts
@@ -1227,6 +1227,9 @@ export class Session extends HeyApiClient {
         [key: string]: boolean
       }
       system?: string
+      thinking?: {
+        effort: "default" | "medium" | "high"
+      }
       parts?: Array<TextPartInput | FilePartInput | AgentPartInput | SubtaskPartInput>
     },
     options?: Options<never, ThrowOnError>,
@@ -1244,6 +1247,7 @@ export class Session extends HeyApiClient {
             { in: "body", key: "noReply" },
             { in: "body", key: "tools" },
             { in: "body", key: "system" },
+            { in: "body", key: "thinking" },
             { in: "body", key: "parts" },
           ],
         },
@@ -1313,6 +1317,9 @@ export class Session extends HeyApiClient {
         [key: string]: boolean
       }
       system?: string
+      thinking?: {
+        effort: "default" | "medium" | "high"
+      }
       parts?: Array<TextPartInput | FilePartInput | AgentPartInput | SubtaskPartInput>
     },
     options?: Options<never, ThrowOnError>,
@@ -1330,6 +1337,7 @@ export class Session extends HeyApiClient {
             { in: "body", key: "noReply" },
             { in: "body", key: "tools" },
             { in: "body", key: "system" },
+            { in: "body", key: "thinking" },
             { in: "body", key: "parts" },
           ],
         },
diff --git a/packages/sdk/js/src/v2/gen/types.gen.ts b/packages/sdk/js/src/v2/gen/types.gen.ts
index c8016012f5..a0ad7b8f76 100644
--- a/packages/sdk/js/src/v2/gen/types.gen.ts
+++ b/packages/sdk/js/src/v2/gen/types.gen.ts
@@ -2922,6 +2922,9 @@ export type SessionPromptData = {
       [key: string]: boolean
     }
     system?: string
+    thinking?: {
+      effort: "default" | "medium" | "high"
+    }
     parts: Array<TextPartInput | FilePartInput | AgentPartInput | SubtaskPartInput>
   }
   path: {
@@ -3105,6 +3108,9 @@ export type SessionPromptAsyncData = {
       [key: string]: boolean
     }
     system?: string
+    thinking?: {
+      effort: "default" | "medium" | "high"
+    }
     parts: Array<TextPartInput | FilePartInput | AgentPartInput | SubtaskPartInput>
   }
   path: {