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GPT-5.5

openaiopenai/gpt-5.5

Next-generation frontier model with 1M context, advanced reasoning, and multimodal input for agentic, coding, and professional workflows.

Context Length
1M
Max Output
128K
Input Priceper 1M tokens
$8.40/ 1M tokens
Output Priceper 1M tokens
$48.00/ 1M tokens

Modalities

textimage→text

Pricing Breakdown

TypeRate
Input$8.40 / 1M tokens
Output$48.00 / 1M tokens

Supported Parameters

temperaturetop_pfrequency_penaltypresence_penaltymax_tokensmax_completion_tokensstoptoolstool_choiceresponse_formatstreamreasoningstructured_output

API Usage Examples

Use the global api.therouter.ai endpoint shown below for new integrations; the legacy China accelerated endpoint is retired.

cURL
curl https://api.therouter.ai/v1/chat/completions   -H "Content-Type: application/json"   -H "Authorization: Bearer $THE_ROUTER_API_KEY"   -d '{
    "model": "openai/gpt-5.5",
    "messages": [
      {"role": "user", "content": "Summarize the key points from this input."}
    ]
  }'
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