Claude Opus 5.5

Long-running agents, coding, and research

Try Claude Opus 5.5 in the Workbench

Run this model interactively, tune parameters, and compare outputs.

Model ID: claude-opus-5-5

Claude Opus 5.5 is Anthropic’s Opus-tier Multimodal LLM for complex coding, long-running agents, and knowledge work. It combines adaptive thinking with improved token efficiency and faster output than Claude Opus 5, while supporting text and image inputs.

The model is designed for high-autonomy work such as codebase migrations, software audits, research, and multi-step professional workflows. It includes the safeguards Anthropic applies to its most capable models; use cases involving biology or cybersecurity may be subject to additional access controls.

Metric	Value
Context Length	1,000,000 tokens
Max Output	128,000 tokens
Multilingual	Yes

Example request

Use the Workbench as a request builder: configure parameters for this model in the UI, then open the API tab to copy the exact cURL or Python call.

Minimal

cURL

curl -X POST https://hub.oxen.ai/api/ai/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OXEN_API_KEY" \
  -d '{
  "model": "claude-opus-5-5",
  "messages": [
    {
      "role": "user",
      "content": "Hello, what can you do?"
    }
  ]
}'

Basic parameters

cURL

curl -X POST https://hub.oxen.ai/api/ai/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OXEN_API_KEY" \
  -d '{
  "model": "claude-opus-5-5",
  "messages": [
    {
      "role": "user",
      "content": "Hello, what can you do?"
    }
  ],
  "temperature": 0.7,
  "max_tokens": 1024,
  "stream": false
}'

Fetch model details

The models endpoint returns the full model object, including its json_request_schema.

curl -H "Authorization: Bearer $OXEN_API_KEY" https://hub.oxen.ai/api/ai/models/claude-opus-5-5

Request parameters

This model follows the standard OpenAI chat completions request body. See the chat completions reference for the full parameter list.