All OpenAI models

GPT-5.5 Pro

OpenAI · released 4 months ago

GPT-5.5 Pro is a OpenAI model with a 1.05M token context window — about 1,500 pages of text. It reads Files, Images, and Text and replies in Text. It can show its reasoning before it answers.

$34.50

input / 1M tokens

$207.00

output / 1M tokens

1.05M

context — about 1,500 pages

$0.34

a client proposal

Pricing

Input
$34.50 per million tokens
Output
$207.00 per million tokens
Web search
1.1¢ per search
Long-context rate (over 272K)
$69.00 in · $310.50 out, per million tokens

Billed from your Alyph wallet. Prices can change when the provider changes theirs — last checked August 9, 2026.

The numbers

Provider
OpenAI
Released
4 months ago (2026-04-24)
Context window
1.05M tokens — about 1,500 pages
Max output
128K tokens per reply
Input
Files, Images, and Text
Output
Text
Reasoning
Shows its thinking before answering
Knowledge cutoff
2025-12-01

Cost vs Token Amount

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80% Input20% Output
free$58.65$117.300 tokens250k500k750k1000k
GPT-5.5 Pro

Adjust the ratio slider to change how output tokens influence the final price for equivalent workloads.

What a task costs

2K tokens in · 500 tokens out.

GPT-5.5 Pro

OpenAI

$0.17

for this task

40% input · 60% output

Full pricing →

Your $5 welcome credit covers about 28 of these.

Compare GPT-5.5 Pro

Closest in price on a typical task:

GPT-5.5 Pro vs GPT-5.4 Pro →GPT-5.5 Pro vs Claude Opus 4.7 (Fast) →GPT-5.5 Pro vs GPT-5.2 Pro →GPT-5.5 Pro vs GPT-4 →Any other combination →

Questions, answered

How much does GPT-5.5 Pro cost on Alyph?

GPT-5.5 Pro costs $34.50 per million input tokens and $207.00 per million output tokens on Alyph. A typical task — 5K tokens in, 800 out — works out to about $0.34. Billed from your Alyph wallet, with hard spending limits. Prices can change when the provider changes theirs; this page was last checked on August 9, 2026.

What is GPT-5.5 Pro's context window?

1.05M tokens — about 1,500 pages. Replies can be up to 128K tokens long. Prompts longer than 272K tokens are billed at the long-context rate.

Can GPT-5.5 Pro read images and files?

GPT-5.5 Pro reads Files, Images, and Text. Drop a file onto the canvas and it becomes part of the context — the only limit is the context window.

Does GPT-5.5 Pro show its reasoning?

Yes. GPT-5.5 Pro can expose its thinking before the final answer, so you can watch how it got there.

Test GPT-5.5 Pro against GPT-5.4 Pro

One prompt, both models at the same time, the better answer wins. Free to start, with $5 of credit.

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