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
Krater rank
#20
Capabilities
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-4o
GPT-4o ("o" for "omni") is OpenAI's latest AI model, supporting both text and image inputs with text outputs.
Open comparisonGPT-5.5 Pro vs GPT-5.5
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks.
Open comparisonFAQ
Questions about GPT-5.5 Pro
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