diff --git a/sdk/python/docs/api-reference.md b/sdk/python/docs/api-reference.md
index f003a2851..f253185dc 100644
--- a/sdk/python/docs/api-reference.md
+++ b/sdk/python/docs/api-reference.md
@@ -245,6 +245,9 @@ Input = list[InputItem] | InputItem
 RunInput = Input | str
 ```
 
+Use `ImageInput` with a base64-encoded `data:image/...` URL. HTTP and HTTPS image URLs are
+deprecated; download remote images and pass their local paths with `LocalImageInput` instead.
+
 Use a plain `str` as shorthand for `TextInput(...)` anywhere a turn input is accepted:
 `thread.run("...")`, `thread.turn("...")`, and `turn.steer("...")`.
 
diff --git a/sdk/python/examples/07_image_and_text/async.py b/sdk/python/examples/07_image_and_text/async.py
index c3237e320..8673e455a 100644
--- a/sdk/python/examples/07_image_and_text/async.py
+++ b/sdk/python/examples/07_image_and_text/async.py
@@ -5,7 +5,7 @@ _EXAMPLES_ROOT = Path(__file__).resolve().parents[1]
 if str(_EXAMPLES_ROOT) not in sys.path:
     sys.path.insert(0, str(_EXAMPLES_ROOT))
 
-from _bootstrap import ensure_local_sdk_src, runtime_config
+from _bootstrap import ensure_local_sdk_src, generated_sample_image_data_url, runtime_config
 
 ensure_local_sdk_src()
 
@@ -13,7 +13,7 @@ import asyncio
 
 from openai_codex import AsyncCodex, ImageInput, TextInput
 
-REMOTE_IMAGE_URL = "https://raw.githubusercontent.com/github/explore/main/topics/python/python.png"
+IMAGE_DATA_URL = generated_sample_image_data_url()
 
 
 async def main() -> None:
@@ -24,7 +24,7 @@ async def main() -> None:
         turn = await thread.turn(
             [
                 TextInput("What is in this image? Give 3 bullets."),
-                ImageInput(REMOTE_IMAGE_URL),
+                ImageInput(IMAGE_DATA_URL),
             ]
         )
         result = await turn.run()
diff --git a/sdk/python/examples/07_image_and_text/sync.py b/sdk/python/examples/07_image_and_text/sync.py
index f7402f18c..1b20f8462 100644
--- a/sdk/python/examples/07_image_and_text/sync.py
+++ b/sdk/python/examples/07_image_and_text/sync.py
@@ -5,20 +5,20 @@ _EXAMPLES_ROOT = Path(__file__).resolve().parents[1]
 if str(_EXAMPLES_ROOT) not in sys.path:
     sys.path.insert(0, str(_EXAMPLES_ROOT))
 
-from _bootstrap import ensure_local_sdk_src, runtime_config
+from _bootstrap import ensure_local_sdk_src, generated_sample_image_data_url, runtime_config
 
 ensure_local_sdk_src()
 
 from openai_codex import Codex, ImageInput, TextInput
 
-REMOTE_IMAGE_URL = "https://raw.githubusercontent.com/github/explore/main/topics/python/python.png"
+IMAGE_DATA_URL = generated_sample_image_data_url()
 
 with Codex(config=runtime_config()) as codex:
     thread = codex.thread_start(model="gpt-5.4", config={"model_reasoning_effort": "high"})
     result = thread.turn(
         [
             TextInput("What is in this image? Give 3 bullets."),
-            ImageInput(REMOTE_IMAGE_URL),
+            ImageInput(IMAGE_DATA_URL),
         ]
     ).run()
 
diff --git a/sdk/python/examples/README.md b/sdk/python/examples/README.md
index 719fb29a4..a86580cc7 100644
--- a/sdk/python/examples/README.md
+++ b/sdk/python/examples/README.md
@@ -72,7 +72,7 @@ python examples/01_quickstart_constructor/async.py
 - `06_thread_lifecycle_and_controls/`
   - thread lifecycle + control calls
 - `07_image_and_text/`
-  - remote image URL + text multimodal turn
+  - image data URL + text multimodal turn
 - `08_local_image_and_text/`
   - local image + text multimodal turn using a generated temporary sample image
 - `09_async_parity/`
diff --git a/sdk/python/examples/_bootstrap.py b/sdk/python/examples/_bootstrap.py
index fde7a32c0..88039f4b9 100644
--- a/sdk/python/examples/_bootstrap.py
+++ b/sdk/python/examples/_bootstrap.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import base64
 import contextlib
 import importlib.util
 import sys
@@ -95,6 +96,11 @@ def _generated_sample_png_bytes() -> bytes:
     )
 
 
+def generated_sample_image_data_url() -> str:
+    encoded = base64.b64encode(_generated_sample_png_bytes()).decode("ascii")
+    return f"data:image/png;base64,{encoded}"
+
+
 @contextlib.contextmanager
 def temporary_sample_image_path() -> Iterator[Path]:
     with tempfile.TemporaryDirectory(prefix="codex-python-example-image-") as temp_root:
diff --git a/sdk/python/notebooks/sdk_walkthrough.ipynb b/sdk/python/notebooks/sdk_walkthrough.ipynb
index 1bb9bf731..3f84cf067 100644
--- a/sdk/python/notebooks/sdk_walkthrough.ipynb
+++ b/sdk/python/notebooks/sdk_walkthrough.ipynb
@@ -103,7 +103,7 @@
    "outputs": [],
    "source": [
     "# Cell 2: imports (public only)\n",
-    "from _bootstrap import server_label\n",
+    "from _bootstrap import generated_sample_image_data_url, server_label\n",
     "from openai_codex import (\n",
     "    AsyncCodex,\n",
     "    Codex,\n",
@@ -349,14 +349,14 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Cell 6: multimodal with remote image\n",
-    "remote_image_url = 'https://raw.githubusercontent.com/github/explore/main/topics/python/python.png'\n",
+    "# Cell 6: multimodal with an image data URL\n",
+    "image_data_url = generated_sample_image_data_url()\n",
     "\n",
     "with Codex() as codex:\n",
     "    thread = codex.thread_start(model='gpt-5.4', config={'model_reasoning_effort': 'high'})\n",
     "    result = thread.turn([\n",
     "        TextInput('What do you see in this image? 3 bullets.'),\n",
-    "        ImageInput(remote_image_url),\n",
+    "        ImageInput(image_data_url),\n",
     "    ]).run()\n",
     "    print('status:', result.status)\n",
     "    print(result.final_response)\n"
diff --git a/sdk/python/src/openai_codex/_inputs.py b/sdk/python/src/openai_codex/_inputs.py
index a6e5e7b52..0a1fbe110 100644
--- a/sdk/python/src/openai_codex/_inputs.py
+++ b/sdk/python/src/openai_codex/_inputs.py
@@ -14,7 +14,7 @@ class TextInput:
 
 @dataclass(slots=True)
 class ImageInput:
-    """Remote image URL supplied as turn input."""
+    """Image data URL supplied as turn input."""
 
     url: str
 
diff --git a/sdk/python/tests/test_app_server_inputs.py b/sdk/python/tests/test_app_server_inputs.py
index 56505e481..29b8fc772 100644
--- a/sdk/python/tests/test_app_server_inputs.py
+++ b/sdk/python/tests/test_app_server_inputs.py
@@ -1,40 +1,45 @@
 from __future__ import annotations
 
+import base64
+
 from app_server_harness import AppServerHarness
 from app_server_helpers import TINY_PNG_BYTES
 
 from openai_codex import Codex, ImageInput, LocalImageInput, SkillInput, TextInput
 
 
-def test_remote_image_input_reaches_responses_api(
+def test_data_url_image_input_reaches_responses_api(
     tmp_path,
 ) -> None:
-    """Remote image inputs should survive the SDK and app-server boundary."""
-    remote_image_url = "https://example.com/codex.png"
+    """Data URL image inputs should survive the SDK and app-server boundary."""
+    image_data_url = "data:image/png;base64," + base64.b64encode(TINY_PNG_BYTES).decode("ascii")
 
     with AppServerHarness(tmp_path) as harness:
         harness.responses.enqueue_assistant_message(
-            "remote image received",
-            response_id="remote-image",
+            "data URL image received",
+            response_id="data-url-image",
         )
 
         with Codex(config=harness.app_server_config()) as codex:
             result = codex.thread_start().run(
                 [
-                    TextInput("Describe the remote image."),
-                    ImageInput(remote_image_url),
+                    TextInput("Describe the data URL image."),
+                    ImageInput(image_data_url),
                 ]
             )
             request = harness.responses.single_request()
 
     assert {
         "final_response": result.final_response,
-        "contains_user_prompt": "Describe the remote image." in request.message_input_texts("user"),
-        "image_urls": request.message_image_urls("user"),
+        "contains_user_prompt": "Describe the data URL image."
+        in request.message_input_texts("user"),
+        "image_url_is_png_data_url": request.message_image_urls("user")[-1].startswith(
+            "data:image/png;base64,"
+        ),
     } == {
-        "final_response": "remote image received",
+        "final_response": "data URL image received",
         "contains_user_prompt": True,
-        "image_urls": [remote_image_url],
+        "image_url_is_png_data_url": True,
     }