GPT-5.5
GPT-5.5 is OpenAI's newest frontier model, focused on agentic coding, computer use, knowledge work, and scientific research with a 1M-token context window.
Technical specification
Modalities
Capabilities
17Reasoning★
Reasoning
Multi-step reasoning★
Reasoning
Long context★
Reasoning
Coding★
Coding
Function Calling
Planning
Structured output★
Structured gen.
Audio understanding
Audio
Image understanding★
Vision
Video Understanding
Other
Chart understanding
Vision
Diagram reasoning
Reasoning
OCR★
Vision
Multilingual★
Language
Planning★
Planning
Streaming output
Reasoning
Interleaved Multimodal Input
Reasoning
Multimodal understanding★
Multimodality
Standard API: $5.00/1M input tokens, $0.50/1M cached input, $30.00/1M output. Batch and Flex: half the standard rate. Priority: 2.5× the standard rate. GPT-5.5 Pro API: $30.00/1M input, $180.00/1M output. For requests exceeding 272K input tokens, pricing increases to 2× input and 1.5× output for the entire session.
INPUT
$5.0000 / per 1M tokens
OUTPUT
$30.0000 / per 1M tokens
CACHE
$0.5000 / per 1M tokens
TOTAL
for 10K tokens
For prompts exceeding 272K input tokens: 2x input and 1.5x output pricing applies for the entire session.
Batch and Flex: half the standard rate.
Priority processing: 2.5x the standard rate.
Security and enterprise
OpenAI rates GPT-5.5's cyber and biological capabilities as High under the Preparedness Framework. The model underwent a full safety and governance process, including targeted evaluations for advanced cyber and biological capabilities and testing with external experts.