GPT-5.5

OpenAI

GPT-5.5 is OpenAI's newest frontier model for the most complex professional work. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs, delivering top-tier performance across coding, professional knowledge, and multi-step agentic tasks. Reasoning effort supports none, low, medium (default), high, and extra-high.

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Capabilities

Thinking

Tool Use

Image Input

PDF Input

Technical Specifications

Context Window

1,050,000 tokens

Max Output

128,000 tokens

Pricing

Token Costs (per 1M tokens)

Cache Miss Input
≤ 272,000 input$5
> 272,000 input$10
Non-Reasoning Output
≤ 272,000 input$30
> 272,000 input$45
Cache Read Input
≤ 272,000 input$0.50
> 272,000 input$1

Tool Costs (per 1K calls)

Web Search

$10

Code Execution

$30

Image Generation

$330