Use Claude text editor with Claude Opus 4.8

by AnthropicCode

Claude Opus 4.8 uses Claude text editor through Opper on the Messages endpoint, passed through as Anthropic defines it.

UseClaude text editorwithin

Add Claude text editor to Claude Opus 4.8

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-opus-4-8", "max_tokens": 1024,
5       "messages": [{"role": "user", "content": "List the files in this repo."}],
6       "tools": [{"type": "text_editor_20250728", "name": "str_replace_based_edit_tool"}]}'

Where you can run it

Claude Opus 4.8 runs Claude text editor on the routes below.

Provider	Region	Zero data retention	Training	Input	Output	Cache read
AWS Bedrock	EU		No	$5.00	$25.00	$0.50$6.25 write
Anthropic	US		No	$5.00	$25.00	$0.50$6.25 write
Google Cloud	Multi		No	$5.00	$25.00	$0.50$6.25 write

The model

Claude Opus 4.8

Claude Opus 4.8 by Anthropic, highly capable model for complex reasoning, coding, and agentic work with 1M context and improved efficiency.

Available on

AnthropicUSAWS BedrockEUAzureGoogle Cloud

Pricing from$5.00/ 1M input$25.00/ 1M output$0.50/ 1M cache read1Mcontext

Privacy

ZDR
Training: No
Region: US, EU, Multi

Use Claude text editor with other models

Step-by-step setup for Claude text editor on each of these models through Opper.

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