GPT-5.5 Pro

OpenAI

GPT-5.5 Pro uses more compute to think harder and provide consistently better answers than GPT-5.5. Built for the toughest problems, it supports multi-turn Responses API requests including through the Batch API. Requests may take several minutes to finish, so background mode is recommended.

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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

$30

Non-Reasoning Output

$180

Tool Costs (per 1K calls)

Web Search

$10

Code Execution

$0.19

Image Generation

$330