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fix(vertexai): ChatAnthropicVertex support images with langchain 1.X #1381

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fix(vertexai): ChatAnthropicVertex support images with langchain 1.X #1381

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789c726
fix(vertexai): ChatAnthropicVertex support images with langchain 1.X
qvalentin Nov 24, 2025
5fe21d4
Merge branch 'main' into fix/anthropic-images-langchain1.X
mdrxy Dec 1, 2025
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21 changes: 11 additions & 10 deletions libs/vertexai/langchain_google_vertexai/_anthropic_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -187,39 +187,40 @@ def _format_message_anthropic(
new_block[copy_attr] = block[copy_attr]

if block["type"] == "image":
if block["source_type"] == "url":
if block["url"].startswith("data:"):
if "url" in block:
url = block["url"]
if url.startswith("data:"):
# Data URI
formatted_block = {
"type": "image",
"source": _format_image(block["url"], project),
"source": _format_image(url, project),
}
else:
formatted_block = {
"type": "image",
"source": {"type": "url", "url": block["url"]},
"source": {"type": "url", "url": url},
}
elif block["source_type"] == "base64":
elif "base64" in block:
formatted_block = {
"type": "image",
"source": {
"type": "base64",
"media_type": block["mime_type"],
"data": block["data"],
"data": block["base64"],
},
}
elif block["source_type"] == "id":
elif "file_id" in block:
formatted_block = {
"type": "image",
"source": {
"type": "file",
"file_id": block["id"],
"file_id": block["file_id"],
},
}
else:
msg = (
"Anthropic only supports 'url' and 'base64' source_type "
"for image content blocks."
"Image content blocks must have either 'url', 'base64', "
"or 'file_id' field."
)
raise ValueError(msg)
content.append(formatted_block)
Expand Down
33 changes: 6 additions & 27 deletions libs/vertexai/tests/unit_tests/test_anthropic_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
SystemMessage,
ToolMessage,
)
from langchain_core.messages.content import create_image_block, create_text_block
from langchain_core.messages.tool import tool_call as create_tool_call

from langchain_google_vertexai._anthropic_utils import (
Expand Down Expand Up @@ -785,25 +786,11 @@ def test_format_messages_anthropic_with_mixed_messages() -> None:
(
[
AIMessage(
content=[
{"type": "text", "text": "Text content"},
{
"type": "image",
"source_type": "url",
"url": "https://example.com/image.png",
},
{
"type": "image",
"source_type": "url",
"url": "data:image/png;base64,/9j/4AAQSk",
},
{
"type": "image",
"source_type": "base64",
"mime_type": "image/png",
"data": "/9j/4AAQSk",
},
{"type": "image", "source_type": "id", "id": "1"},
Comment on lines -788 to -806
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@mdrxy mdrxy Dec 2, 2025

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we must continue to maintain support for these input formats; we should not remove these tests

content_blocks=[
create_text_block(text="Text content"),
create_image_block(url="https://example.com/image.png"),
create_image_block(base64="/9j/4AAQSk", mime_type="image/png"),
create_image_block(file_id="1"),
]
),
],
Expand All @@ -828,14 +815,6 @@ def test_format_messages_anthropic_with_mixed_messages() -> None:
"data": "/9j/4AAQSk",
},
},
{
"type": "image",
"source": {
"type": "base64",
"media_type": "image/png",
"data": "/9j/4AAQSk",
},
},
Comment on lines -831 to -838
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@mdrxy mdrxy Dec 2, 2025

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same here

{"type": "image", "source": {"type": "file", "file_id": "1"}},
],
}
Expand Down