diff --git a/src/services/kiaai/chat.py b/src/services/kiaai/chat.py
index d55c110..2e17d23 100644
--- a/src/services/kiaai/chat.py
+++ b/src/services/kiaai/chat.py
@@ -122,6 +122,10 @@ class KiaAIService:
         Core SSE parser — yields one AIMessageChunk per content delta token.
         Final chunk: AIMessageChunk(content="", usage_metadata={...}).
         Raises RuntimeError on KIA server errors (triggers retry in stream()).
+
+        Uses aiter_bytes(chunk_size=32) instead of aiter_lines() so every
+        byte received from the network is processed immediately without
+        waiting for httpx's internal 64 KB read buffer to fill up.
         """
         usage: dict = {}
 
@@ -139,57 +143,69 @@ class KiaAIService:
                 resp.raise_for_status()
 
                 line_count = 0
-                async for line in resp.aiter_lines():
-                    line_count += 1
-                    if line_count <= 3:
-                        print(f"[KiaAI] raw[{line_count}]: {line!r}")
+                buf = ""
+                done = False
 
-                    if not line:
-                        continue
+                async for raw in resp.aiter_bytes(chunk_size=32):
+                    buf += raw.decode("utf-8", errors="replace")
+
+                    while "\n" in buf:
+                        line, buf = buf.split("\n", 1)
+                        line = line.rstrip("\r")
+                        line_count += 1
+                        if line_count <= 3:
+                            print(f"[KiaAI] raw[{line_count}]: {line!r}")
+
+                        if not line:
+                            continue
+
+                        # Non-data lines may carry KIA error JSON
+                        if not line.startswith("data:"):
+                            try:
+                                err = json.loads(line)
+                                code = err.get("code")
+                                if code and int(code) >= 400:
+                                    msg = err.get("msg", "Unknown error")
+                                    print(f"[KiaAI] Error line: code={code} msg={msg!r}")
+                                    raise RuntimeError(f"KIA error {code}: {msg}")
+                            except (json.JSONDecodeError, ValueError):
+                                pass
+                            print(f"[KiaAI] non-data line: {line!r}")
+                            continue
+
+                        raw_data = line[6:] if line.startswith("data: ") else line[5:]
+
+                        if raw_data.strip() == "[DONE]":
+                            print("[KiaAI] [DONE]")
+                            done = True
+                            break
 
-                    # Non-data lines may carry KIA error JSON
-                    if not line.startswith("data:"):
                         try:
-                            err = json.loads(line)
-                            code = err.get("code")
-                            if code and int(code) >= 400:
-                                msg = err.get("msg", "Unknown error")
-                                print(f"[KiaAI] Error line: code={code} msg={msg!r}")
-                                raise RuntimeError(f"KIA error {code}: {msg}")
-                        except (json.JSONDecodeError, ValueError):
-                            pass
-                        print(f"[KiaAI] non-data line: {line!r}")
-                        continue
+                            data = json.loads(raw_data)
+                        except json.JSONDecodeError:
+                            print(f"[KiaAI] JSON decode error: {raw_data!r}")
+                            continue
 
-                    raw_data = line[6:] if line.startswith("data: ") else line[5:]
+                        # KIA server error embedded in stream body
+                        if data.get("code") and int(data["code"]) >= 500:
+                            msg = data.get("msg", "Unknown error")
+                            print(f"[KiaAI] Error chunk: {data['code']} {msg!r}")
+                            raise RuntimeError(f"KIA error {data['code']}: {msg}")
 
-                    if raw_data.strip() == "[DONE]":
-                        print("[KiaAI] [DONE]")
+                        # Yield content tokens
+                        for choice in (data.get("choices") or []):
+                            delta = choice.get("delta") or {}
+                            token = delta.get("content") or ""
+                            if token:
+                                yield AIMessageChunk(content=token)
+
+                        # Capture usage from final summary chunk
+                        if data.get("usage"):
+                            usage = data["usage"]
+
+                    if done:
                         break
 
-                    try:
-                        data = json.loads(raw_data)
-                    except json.JSONDecodeError:
-                        print(f"[KiaAI] JSON decode error: {raw_data!r}")
-                        continue
-
-                    # KIA server error embedded in stream body
-                    if data.get("code") and int(data["code"]) >= 500:
-                        msg = data.get("msg", "Unknown error")
-                        print(f"[KiaAI] Error chunk: {data['code']} {msg!r}")
-                        raise RuntimeError(f"KIA error {data['code']}: {msg}")
-
-                    # Yield content tokens
-                    for choice in (data.get("choices") or []):
-                        delta = choice.get("delta") or {}
-                        token = delta.get("content") or ""
-                        if token:
-                            yield AIMessageChunk(content=token)
-
-                    # Capture usage from final summary chunk
-                    if data.get("usage"):
-                        usage = data["usage"]
-
         # Final chunk carries usage metadata
         print(f"[KiaAI] Stream done | total_lines={line_count} | usage={usage}")
         yield AIMessageChunk(