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openaiopenai·Apr 24, 2026

OpenAI: GPT-5.5 Pro

openai/gpt-5.5-pro
context
1.1M
Max Output
128K
Input / 1M
$30.00
Output / 1M
$180.00

About

GPT-5.5 Pro is a high-capability model from OpenAI optimized for deep reasoning and accuracy on complex workloads. It provides a context window of roughly 1,050,000 tokens (922K input, 128K output) and accepts text and image input. The model is designed for long-horizon problem solving, agentic coding, and multi-step execution, and exposes selectable reasoning effort levels. It does not offer a cached input discount.

Capabilities

Context Length
1.1M
Max Output
128K
Reasoning
Yes
In
file, image, text
Out
text

Pricing

Full pricing
Type≤272K>272K
Input$30.00$60.00
Output$180.00$270.00
Web Search$0.01 / call

API

API reference

OpenAI-compatible · Model ID openai/gpt-5.5-pro

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

OFTEN COMPARED

GPT-5.5 Pro comparisons

Decide which model wins on the dimensions that matter for your workload — context, benchmarks, pricing, or serving latency.