chore: import upstream snapshot with attribution

2026-07-13 12:49:20 +08:00
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+<!--
+name: 'Data: Files API reference — Python'
+description: Python Files API reference including file upload, listing, deletion, and usage in messages
+ccVersion: 2.1.118
+-->
+# Files API — Python
+
+The Files API uploads files for use in Messages API requests. Reference files via `file_id` in content blocks, avoiding re-uploads across multiple API calls.
+
+**Beta:** Pass `betas=["files-api-2025-04-14"]` in your API calls (the SDK sets the required header automatically).
+
+## Key Facts
+
+- Maximum file size: 500 MB
+- Total storage: 100 GB per organization
+- Files persist until deleted
+- File operations (upload, list, delete) are free; content used in messages is billed as input tokens
+- Not available on Amazon Bedrock or Google Vertex AI
+
+---
+
+## Upload a File
+
+The `file` argument accepts a `(filename, content, content_type)` tuple, a `pathlib.Path` (or any `PathLike` — read for you, async-safe with `AsyncAnthropic`), or an open binary file object.
+
+```python
+import anthropic
+from pathlib import Path
+
+client = anthropic.Anthropic()
+
+uploaded = client.beta.files.upload(
+    file=("report.pdf", open("report.pdf", "rb"), "application/pdf"),
+)
+# or: client.beta.files.upload(file=Path("report.pdf"))
+print(f"File ID: {uploaded.id}")
+print(f"Size: {uploaded.size_bytes} bytes")
+```
+
+---
+
+## Use a File in Messages
+
+### PDF / Text Document
+
+```python
+response = client.beta.messages.create(
+    model="{{OPUS_ID}}",
+    max_tokens=16000,
+    messages=[{
+        "role": "user",
+        "content": [
+            {"type": "text", "text": "Summarize the key findings in this report."},
+            {
+                "type": "document",
+                "source": {"type": "file", "file_id": uploaded.id},
+                "title": "Q4 Report",           # optional
+                "citations": {"enabled": True}   # optional, enables citations
+            }
+        ]
+    }],
+    betas=["files-api-2025-04-14"],
+)
+for block in response.content:
+    if block.type == "text":
+        print(block.text)
+```
+
+### Image
+
+```python
+image_file = client.beta.files.upload(
+    file=("photo.png", open("photo.png", "rb"), "image/png"),
+)
+
+response = client.beta.messages.create(
+    model="{{OPUS_ID}}",
+    max_tokens=16000,
+    messages=[{
+        "role": "user",
+        "content": [
+            {"type": "text", "text": "What's in this image?"},
+            {
+                "type": "image",
+                "source": {"type": "file", "file_id": image_file.id}
+            }
+        ]
+    }],
+    betas=["files-api-2025-04-14"],
+)
+```
+
+---
+
+## Manage Files
+
+### List Files
+
+Iterate the list result directly — the SDK auto-paginates across all pages. Only use `.data` if you want the first page only.
+
+```python
+for f in client.beta.files.list():
+    print(f"{f.id}: {f.filename} ({f.size_bytes} bytes)")
+```
+
+### Get File Metadata
+
+```python
+file_info = client.beta.files.retrieve_metadata("file_011CNha8iCJcU1wXNR6q4V8w")
+print(f"Filename: {file_info.filename}")
+print(f"MIME type: {file_info.mime_type}")
+```
+
+### Delete a File
+
+```python
+client.beta.files.delete("file_011CNha8iCJcU1wXNR6q4V8w")
+```
+
+### Download a File
+
+Only files created by the code execution tool or skills can be downloaded (not user-uploaded files).
+
+```python
+file_content = client.beta.files.download("file_011CNha8iCJcU1wXNR6q4V8w")
+file_content.write_to_file("output.txt")
+```
+
+---
+
+## Full End-to-End Example
+
+Upload a document once, ask multiple questions about it:
+
+```python
+import anthropic
+
+client = anthropic.Anthropic()
+
+# 1. Upload once
+uploaded = client.beta.files.upload(
+    file=("contract.pdf", open("contract.pdf", "rb"), "application/pdf"),
+)
+print(f"Uploaded: {uploaded.id}")
+
+# 2. Ask multiple questions using the same file_id
+questions = [
+    "What are the key terms and conditions?",
+    "What is the termination clause?",
+    "Summarize the payment schedule.",
+]
+
+for question in questions:
+    response = client.beta.messages.create(
+        model="{{OPUS_ID}}",
+        max_tokens=16000,
+        messages=[{
+            "role": "user",
+            "content": [
+                {"type": "text", "text": question},
+                {
+                    "type": "document",
+                    "source": {"type": "file", "file_id": uploaded.id}
+                }
+            ]
+        }],
+        betas=["files-api-2025-04-14"],
+    )
+    print(f"\nQ: {question}")
+    text = next((b.text for b in response.content if b.type == "text"), "")
+    print(f"A: {text[:200]}")
+
+# 3. Clean up when done
+client.beta.files.delete(uploaded.id)
+```