GPT-5.5 Proon Krater.ai
OpenAI's GPT-5.5 Pro is the premium tier of GPT-5.5, with extended chain-of-thought reasoning for the hardest engineering, math, and research problems. 1M-token context, frontier accuracy.
Released April 24, 2026
Specifications
GPT-5.5 Pro at a glance
Context
1.1M tokens
Max output
128K tokens
Input
File, Image, Text
Output
Text
Input price
$30.00 / 1M
Output price
$180.00 / 1M
Knowledge cutoff
2025-12-01
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Live ChatGPT statusCapabilities
What it is good at
Catalog capabilities
- Accepts image input
- Generates text responses
- Supports tool calling
- Supports structured outputs
- Extended thinking for hard problems
- Top-tier code generation and refactoring
Good for
Compare
Compare GPT-5.5 Pro
GPT-5.5 Pro vs GPT-5.2 Pro
GPT-5.2 Pro is OpenAI’s most advanced model, offering major improvements in agentic coding and long context performance over GPT-5 Pro.
Open comparisonGPT-5.5 Pro vs GPT-5.2 Chat
GPT-5.2 Chat (AKA Instant) is the fast, lightweight member of the 5.2 family, optimized for low-latency chat while retaining strong general intelligence.
Open comparisonGPT-5.5 Pro vs GPT-4.1
GPT-4.1 is a flagship large language model optimized for advanced instruction following, real-world software engineering, and long-context reasoning.
Open comparisonFAQ
Questions about GPT-5.5 Pro
Clear answers based on the model catalog and Krater access.