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Try Claude Opus 4 in the Workbench

Run this model interactively, tune parameters, and compare outputs.
Model ID: claude-opus-4-20250514 Claude Opus 4 is a Multimodal LLM designed for reasoning-heavy tasks and complex coding workflows. It excels in sustained performance on long-running tasks that require focused effort and thousands of steps, including agentic search, large-scale code refactoring, and multi-step problem solving. Some other noteworthy features of Claude Opus 4 include “extended thinking” mode for more deliberate reasoning, tool use capabilities, and memory tracking across complex workflows.
MetricValue
Parameter CountUnknown
Mixture of ExpertsUnknown
Context Length200,000 tokens input, 32,000 tokens output
MultilingualUnknown
Quantized*Unknown
*Quantization is specific to the inference provider and the model may be offered with different quantization levels by other providers.

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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.
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-4-20250514",
  "messages": [
    {
      "role": "user",
      "content": "Hello, what can you do?"
    }
  ]
}'

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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-4-20250514

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Request parameters

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