GPT 5.5 - Oxen.ai

Try GPT 5.5 in the Workbench

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

Model ID: gpt-5-5-2026-04-23 GPT 5.5 is OpenAI’s latest frontier model, succeeding GPT 5.4 with improved reasoning, instruction following, and tool use. It carries forward the 1,050,000-token context window and configurable reasoning effort levels (none, low, medium, high, xhigh), with broad tool support including web search, file search, image generation, code interpreter, hosted shell, computer use, and MCP. Note: Prompts exceeding 272K input tokens incur 2x input and 1.5x output pricing for the full session.

Metric	Value
Parameter Count	Unknown
Mixture of Experts	Unknown
Context Length	1,050,000 tokens
Max Output Tokens	128,000 tokens
Multilingual	Yes
Quantized*	Unknown

*Quantization is specific to the inference provider and the model may be offered with different quantization levels by other providers.

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
Basic parameters
All parameters

curl -X POST https://hub.oxen.ai/api/ai/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OXEN_API_KEY" \
  -d '{
  "model": "gpt-5-5-2026-04-23",
  "messages": [
    {
      "role": "user",
      "content": "Hello, what can you do?"
    }
  ]
}'

curl -X POST https://hub.oxen.ai/api/ai/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OXEN_API_KEY" \
  -d '{
  "model": "gpt-5-5-2026-04-23",
  "messages": [
    {
      "role": "user",
      "content": "Hello, what can you do?"
    }
  ],
  "temperature": 0.7,
  "max_tokens": 1024,
  "stream": false
}'

curl -X POST https://hub.oxen.ai/api/ai/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OXEN_API_KEY" \
  -d '{
  "model": "gpt-5-5-2026-04-23",
  "messages": [
    {
      "role": "user",
      "content": "Hello, what can you do?"
    }
  ],
  "temperature": 0.7,
  "max_tokens": 1024,
  "stream": false,
  "top_p": 1.0,
  "frequency_penalty": 0,
  "presence_penalty": 0
}'

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/gpt-5-5-2026-04-23

Request parameters

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

Try GPT 5.5 in the Workbench

​Example request

​Fetch model details

​Request parameters

Example request

Fetch model details

Request parameters