--- title: "PDF and file reading for any model, with redaction" canonical: https://relayswitch.io/features/files generated: 2026-11-02T10:04:27.490Z source: https://api.relayswitch.io/v1/catalog base_url: https://api.relayswitch.io/v1 --- Files and redaction # Any model reads the PDF. No model sees the secret. Send documents in the shape your SDK uses; models that cannot read files get them as text. Turn on redaction and keys, tokens and personal data are swapped for placeholders before the prompt leaves. [Get an agent key](https://app.relayswitch.io/console)[Code](#example) From the live catalog Models that read files natively 37 Models that get the text 304 File types 23 Largest file 20 MB Pages read first 50 Conversion Free ## What it does for an agent PDFs for every model 304 models read documents as text, 37 natively. The agent sends the same file part to all of them. Office files and images bmp, csv, docx, et, gif, htm, html, jpeg, jpg, md and 13 more types. By URL or inline A data URL, bare base64 or an https link. Private and loopback addresses are refused. Secrets swapped out API keys, tokens and private keys become \[\[SECRET\_1\]\] style placeholders before the request is forwarded. Personal data too secrets\_pii adds emails, phone numbers, card numbers, US SSNs and IBANs. Answers stay readable The originals are put back in the answer, so the agent works with real values and the model never saw them. ## Copy, paste, run OpenAI SDK: a PDF to any model python 1`import base64` 2`from openai import OpenAI` 3`import os` 4 5`client = OpenAI(` 6 `base_url="https://api.relayswitch.io/v1",` 7 `api_key=os.environ["RELAYSWITCH_API_KEY"],` 8`)` 9 10`pdf = base64.b64encode(open("contract.pdf", "rb").read()).decode()` 11`reply = client.chat.completions.create(` 12 `model="deepseek-v4.1-flash", # reads the PDF as text` 13 `messages=[{"role": "user", "content": [` 14 `{"type": "text", "text": "List every termination clause."},` 15 `{"type": "file", "file": {` 16 `"filename": "contract.pdf",` 17 `"file_data": f"data:application/pdf;base64,{pdf}",` 18 `}},` 19 `]}],` 20`)` 21`print(reply.choices[0].message.content)` Anthropic SDK: a document by URL python 1`import anthropic` 2`import os` 3 4`client = anthropic.Anthropic(` 5 `base_url="https://api.relayswitch.io/v1",` 6 `api_key=os.environ["RELAYSWITCH_API_KEY"],` 7`)` 8 9`reply = client.messages.create(` 10 `model="claude-sonnet-5-5",` 11 `max_tokens=1024,` 12 `messages=[{"role": "user", "content": [` 13 `{"type": "document", "source": {` 14 `"type": "url",` 15 `"url": "https://example.com/q3-report.pdf",` 16 `}},` 17 `{"type": "text", "text": "Summarize revenue by region."},` 18 `]}],` 19`)` 20`print(reply.content[0].text)` curl: redact one request bash 1`curl -i https://api.relayswitch.io/v1/chat/completions \` 2 `-H "Authorization: Bearer $RELAYSWITCH_API_KEY" \` 3 `-H "x-uplink-redact: secrets_pii" \` 4 `-H "Content-Type: application/json" \` 5 `-d '{"model": "deepseek-v4.1-flash", "messages": [{"role": "user",` 6 `"content": "Debug this: AWS_SECRET=... failed for jane@example.com"}]}'` 7`# The model sees [[SECRET_1]] and a placeholder for the email.` 8`# x-uplink-redactions: 2 The answer carries the originals back.` Key API: redact by default bash 1`# Every request on this agent's key, redacted by default.` 2`curl -X PATCH https://api.relayswitch.io/v1/keys/KEY_ID \` 3 `-H "Authorization: Bearer $ADMIN_KEY" \` 4 `-H "Content-Type: application/json" \` 5 `-d '{"redact": "secrets"}'` ## Models that read files natively A sample from the live catalog, USD per million tokens. | Model | Input | Output | | --- | --- | --- | | [Claude Fable 5](https://relayswitch.io/models/claude-fable-5) | $3.00 | $15.00 | | [Claude Fable 5.1](https://relayswitch.io/models/claude-fable-5.1) | $6.00 | $30.00 | | [Claude Haiku 4.5](https://relayswitch.io/models/claude-haiku-4-5) | $0.60 | $3.00 | | [Claude Haiku 5.5](https://relayswitch.io/models/claude-haiku-5-5) | $0.06 | $0.15 | | [Claude Opus 4.6](https://relayswitch.io/models/claude-opus-4-6) | $1.80 | $7.50 | | [Claude Opus 4.7](https://relayswitch.io/models/claude-opus-4-7) | $1.80 | $7.50 | | [Claude Opus 4.8](https://relayswitch.io/models/claude-opus-4-8) | $1.80 | $7.50 | | [Claude Opus 5](https://relayswitch.io/models/claude-opus-5) | $1.80 | $7.50 | Agent setup guides - [OpenClaw](https://relayswitch.io/guides/openclaw) - [Hermes Agent](https://relayswitch.io/guides/hermes-agent) - [OpenCode](https://relayswitch.io/guides/opencode) - [Claude Code](https://relayswitch.io/guides/claude-code) - [n8n](https://relayswitch.io/guides/n8n) More features - [Agent tools](https://relayswitch.io/features/agent-tools) - [Routing](https://relayswitch.io/features/routing) - [Caching and compression](https://relayswitch.io/features/caching) - [Guardrails and sign-in](https://relayswitch.io/features/guardrails) - [MCP gateway](https://relayswitch.io/features/mcp-gateway) - [Endpoints](https://relayswitch.io/features/endpoints) - [Key budgets](https://relayswitch.io/features/key-budgets) - [Observability](https://relayswitch.io/features/observability) - [Hosted agents](https://relayswitch.io/agents) - [Workflows](https://relayswitch.io/workflows) - [Docs](https://relayswitch.io/docs) FAQs ## Questions For agent builders. Open the console A key in under a minute [Get a key](https://app.relayswitch.io/console) Or email [hello@relayswitch.io](mailto:hello@relayswitch.io) ### ### ### ### ### ### ## Hand your agent the documents Every model reads them, and redaction keeps the secrets on your side. [All features](https://relayswitch.io/features)[Get an agent key](https://app.relayswitch.io/console)