"vendor": "openai""model_name": "gpt-5.5"OpenAI's latest flagship LLM with 1M+ context window, tiered pricing, and cached input support via chat completions and responses endpoints
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GPT-5.5 is OpenAI's latest flagship large language model, accessible through MuleRouter via the standard OpenAI-compatible Chat Completions and Responses endpoints. It features an extended context window with tiered pricing that adjusts based on context length (272K token boundary).
/vendors/openai/v1/chat/completions or /vendors/openai/v1/responses endpoints| Endpoint | Path |
|---|---|
| Chat Completions | /vendors/openai/v1/chat/completions |
| Responses | /vendors/openai/v1/responses |
Set model to gpt-5.5 in your request body. All standard OpenAI chat completion parameters are supported.