flagshipReleased 2026-04

GPT-5.5

By OpenAI · Flagship reasoning, agents, multimodal.

Input / 1M

$5.00

Output / 1M

$30.00

Context

1.1M tokens

Max output

128K tokens

GPT-5.5 pricing

GPT-5.5 costs $5.00 per million input tokens and $30.00 per million output tokens at standard API rates, with cached input at $0.50/M. That makes it cheaper than 2 of 25 other tracked models on input.

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GPT-5.5 benchmarks

SWE-bench Verified82.6%

SWE-bench Pro58.6%

OSWorld-Verified78.7%

Terminal-Bench 2.178.2%

Ranks #2 on SWE-bench Verified among tracked models.

Specs

Maker: OpenAI
Category: flagship
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 with

GPT-5.4

OpenAI · $2.50/$15.00 per 1M

Claude Opus 4.8

Anthropic · $5.00/$25.00 per 1M

Claude Sonnet 4.6

Anthropic · $3.00/$15.00 per 1M

Gemini 3.1 Pro

Google · $2.00/$12.00 per 1M

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