Use Claude web fetch with Claude Sonnet 5

by AnthropicWeb fetch

Claude Sonnet 5 uses Claude web fetch through Opper on the Messages endpoint, passed through as Anthropic defines it. It runs on Anthropic's own route, not on Bedrock or Vertex.

UseClaude web fetchwithin

Add Claude web fetch to Claude Sonnet 5

Set up with agents

Paste this into your coding agent (Claude Code, Cursor, Codex, and more) and it will set up and build with Opper for you.

Get your API key

In your code

1curl https://api.opper.ai/v3/compat/v1/messages \
2  -H "Authorization: Bearer $OPPER_API_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{"model": "anthropic/claude-sonnet-5", "max_tokens": 1024,
5       "messages": [{"role": "user", "content": "Summarise https://opper.ai/pricing"}],
6       "tools": [{"type": "web_fetch_20250910", "name": "web_fetch", "max_uses": 3}]}'

Where you can run it

Claude Sonnet 5 runs Claude web fetch on the routes below.

Provider	Region	Zero data retention	Training	Input	Output	Cache read
Anthropic	US		No	$2.00	$10.00	$0.20$2.50 write

The model

Claude Sonnet 5

Claude Sonnet 5 is Anthropic's balanced production model, bringing near-Opus agentic coding and tool use to a 1M token context window.

Available on

AnthropicUSAWS BedrockEUAzureGoogle Cloud

Pricing from$2.00/ 1M input$10.00/ 1M output$0.20/ 1M cache read1Mcontext

Privacy

ZDR
Training: No
Region: US, EU, Multi

Use Claude web fetch with other models

Step-by-step setup for Claude web fetch on each of these models through Opper.

Claude Haiku 5.5 Claude Sonnet 5.5 Claude Opus 5.5 Claude Fable 5.1 Claude Opus 5 Claude Fable 5 Claude Opus 4.8 See all 700+ models

More tools on Opper

Jina Reader

Turn any URL into clean markdown a model can read. Opper's web fetch, running in the EU.

Read/v3/tools/web/fetch

Gemini URL context

Gemini reads the URLs in your prompt itself, on generateContent.

ReadurlContext

Jina search

Opper's default search engine for models without their own. Search processing stays in the EU.

Search"engine": "jina"