diff --git a/packages/tui/src/component/prompt/index.tsx b/packages/tui/src/component/prompt/index.tsx
index 02f6342605c8..80d4bfa8b8fe 100644
--- a/packages/tui/src/component/prompt/index.tsx
+++ b/packages/tui/src/component/prompt/index.tsx
@@ -31,7 +31,7 @@ import { promptOffsetWidth } from "../../prompt/display"
 import { createStore, produce, unwrap } from "solid-js/store"
 import { usePromptHistory, type PromptInfo } from "../../prompt/history"
 import { computePromptTraits } from "../../prompt/traits"
-import { expandPastedTextPlaceholders, expandTrackedPastedText } from "../../prompt/part"
+import { countPasteLines, expandPastedTextPlaceholders, expandTrackedPastedText, shouldSummarizePaste } from "../../prompt/part"
 import { usePromptStash } from "../../prompt/stash"
 import { DialogStash } from "../dialog-stash"
 import { type AutocompleteRef, Autocomplete } from "./autocomplete"
@@ -1198,12 +1198,11 @@ export function Prompt(props: PromptProps) {
       }
     }
 
-    const lineCount = (pastedContent.match(/\n/g)?.length ?? 0) + 1
     if (
-      (lineCount >= 3 || pastedContent.length > 150) &&
+      shouldSummarizePaste(pastedContent) &&
       kv.get("paste_summary_enabled", !sync.data.config.experimental?.disable_paste_summary)
     ) {
-      pasteText(pastedContent, `[Pasted ~${lineCount} lines]`)
+      pasteText(pastedContent, `[Pasted ~${countPasteLines(pastedContent)} lines]`)
       return
     }
 
diff --git a/packages/tui/src/prompt/part.ts b/packages/tui/src/prompt/part.ts
index 0027b9aaed77..ff9ff46b16d8 100644
--- a/packages/tui/src/prompt/part.ts
+++ b/packages/tui/src/prompt/part.ts
@@ -1,5 +1,19 @@
 import { displaySlice } from "./display"
 
+// Summarize only genuinely large pastes into a "[Pasted ~N lines]" placeholder.
+// Short pastes, including dictated speech-to-text input (typically a sentence
+// or two on a single line), must stay inline and editable.
+const PASTE_SUMMARY_LINE_LIMIT = 10
+const PASTE_SUMMARY_CHAR_LIMIT = 1000
+
+export function countPasteLines(text: string) {
+  return (text.match(/\n/g)?.length ?? 0) + 1
+}
+
+export function shouldSummarizePaste(text: string) {
+  return countPasteLines(text) > PASTE_SUMMARY_LINE_LIMIT || text.length > PASTE_SUMMARY_CHAR_LIMIT
+}
+
 export function stripPromptPartIDs<Part extends { id: string; messageID: string; sessionID: string }>(part: Part) {
   const { id: _id, messageID: _messageID, sessionID: _sessionID, ...rest } = part
   return rest
diff --git a/packages/tui/test/prompt/part.test.ts b/packages/tui/test/prompt/part.test.ts
index 2d5605ac0c49..b4651fcf3b6d 100644
--- a/packages/tui/test/prompt/part.test.ts
+++ b/packages/tui/test/prompt/part.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test"
-import { expandTrackedPastedText, stripPromptPartIDs } from "../../src/prompt/part"
+import { expandTrackedPastedText, shouldSummarizePaste, stripPromptPartIDs } from "../../src/prompt/part"
 
 describe("prompt part", () => {
   test("strips persisted IDs from reused parts", () => {
@@ -36,6 +36,22 @@ describe("prompt part", () => {
     ).toBe("你好你好\npublic:\n\tvoid ExecuteTask();\nprivate:\n阿斯顿法国红酒看来")
   })
 
+  test("keeps short pastes inline", () => {
+    expect(shouldSummarizePaste("a short sentence")).toBe(false)
+    expect(shouldSummarizePaste("one\ntwo\nthree\nfour lines")).toBe(false)
+    // dictated speech-to-text sized input: a paragraph on a single line
+    expect(shouldSummarizePaste("word ".repeat(150).trim())).toBe(false)
+    // boundary: exactly at the limits stays inline
+    expect(shouldSummarizePaste(Array.from({ length: 10 }, () => "line").join("\n"))).toBe(false)
+    expect(shouldSummarizePaste("x".repeat(1000))).toBe(false)
+  })
+
+  test("summarizes genuinely large pastes", () => {
+    expect(shouldSummarizePaste("x".repeat(1001))).toBe(true)
+    expect(shouldSummarizePaste(Array.from({ length: 11 }, () => "line").join("\n"))).toBe(true)
+    expect(shouldSummarizePaste("log line\n".repeat(200))).toBe(true)
+  })
+
   test("only expands the tracked placeholder occurrence", () => {
     const marker = "[Pasted ~3 lines]"
     const prefix = `keep ${marker} then `