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GPT-5.5 Pro

GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads.

Try in ewpireopenai/gpt-5.5-pro

Opens in the ewpire workspace. Creating an account is free; runs are paid from your credits.

GPT-5.5 Pro in plain words

GPT-5.5 Pro is a text model from OpenAI. It takes files, images, and text as input and returns text. Its context window is 1,050,000 tokens. It costs 37.235295 credits per 1M input tokens and 223.411765 credits per 1M output tokens. A request with 272,000 or more input tokens is charged, as a whole, at 74.470589 credits per 1M input tokens and 335.117648 credits per 1M output tokens.

It is good at reasoning through multi-step problems, reading attached files, and calling tools. It reads images as well as text. A context window of 1,050,000 tokens holds about 4,200,000 characters of English text, at 4 characters a token.

For example, a question of 2,000 tokens (about 8,000 characters) with an answer of 1,000 tokens (about 4,000 characters) costs 0.297883 credits. The exact charge follows the usage the model reports for your request.

Details

Made by
OpenAI
Good at
ReasoningVisionFilesTool use
Reads
Files, Images, Text
Produces
Text
Context window
1,050,000 tokens

Price

Input, per 1M tokens
37.235295 credits
Output, per 1M tokens
223.411765 credits

Requests with 272,000 or more input tokens

Input, per 1M tokens
74.470589 credits
Output, per 1M tokens
335.117648 credits

The whole request is charged at these rates, not only the tokens past that size.

Charged per request from your credit balance. No subscription. See pricing

In the API – coming soon

API keys are not open yet. The docs show how to call this model with the OpenAI SDK or plain HTTP once they are. Read the docs

curl https://ewpire.com/api/v1/chat/completions \
  -H "Authorization: Bearer $EWPIRE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-5.5-pro","messages":[{"role":"user","content":"Hello!"}]}'

The docs show how to list the models the API serves, with their capabilities and prices, once API keys are open. Models in the docs

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