GPT-5.5 Pro API: Pricing and Specs

GPT-5.5 Pro API

GPT-5.5 Pro is a large language model by OpenAI, available on the Venice API as openai-gpt-55-pro. Requests are anonymized, so the provider never sees your identity.GPT-5.5 Pro, the successor to GPT-5.4 Pro, builds on GPT-5.5’s unified architecture with enhanced reasoning for complex, high-stakes tasks. It provides a 1M+ token context window (922K input, 128K output) and supports text and image inputs.

GPT-5.5 Pro API pricing

Model ID	Variant	Privacy	Price
`openai-gpt-55-pro`	Standard	Anonymized	$30.00 / $180 per 1M

GPT-5.5 Pro specifications

Spec	Value
Provider	OpenAI
Released	Apr 24, 2026
Privacy	Anonymized
Status	Stable
Context window	1M tokens
Max output	128K tokens
Reasoning effort	medium, high, xhigh

How to use the GPT-5.5 Pro API

Send requests to POST https://api.venice.ai/api/v1/responses with "model": "openai-gpt-55-pro" and your API key.

curl https://api.venice.ai/api/v1/responses \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai-gpt-55-pro",
    "input": "Explain TEE attestation in two sentences.",
    "reasoning": { "effort": "medium" }
  }'

Related models

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Claude Fable 5 API: $10.00 / $50.00 per 1M
Claude Fable 5.1 API: $10.00 / $50.00 per 1M
GPT-6.1 Sol Ultrafast API: $12.00 / $60.00 per 1M

Explore

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GPT-5.5 Pro API