reasoningReleased 2026-04

GPT-5.5 Pro

By OpenAI · Hardest reasoning, maximum accuracy.

Input / 1M

$30.00

Output / 1M

$180.00

Context

1.1M tokens

Max output

128K tokens

GPT-5.5 Pro pricing

GPT-5.5 Pro costs $30.00 per million input tokens and $180.00 per million output tokens at standard API rates. That makes it cheaper than 0 of 25 other tracked models on input.

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Specs

Maker: OpenAI
Category: reasoning
Released: 2026-04
Modalities: text, vision
Open weights: No (proprietary API)
Context window: 1.1M tokens
Max output: 128K tokens

Official API docs ↗

Compare GPT-5.5 Pro with

GPT-5.2-Codex

OpenAI · $1.75/$14.00 per 1M

DeepSeek-R1

DeepSeek · $0.55/$2.19 per 1M

Grok 4.3

xAI · $1.25/$2.50 per 1M

GPT-5.5

OpenAI · $5.00/$30.00 per 1M

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Data verified 2026-06-20. Prices are standard USD API rates per 1M tokens.