GPT-5.5

OpenAI · Released April 2026 · Knowledge cutoff December 2025

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...

It is part of OpenAI's GPT family, where Sol, Luna and Terra mark the current generation's capability tiers and Pro servings trade speed for deeper computation.

Facts and pricing

Provider

OpenAI

Context window

1.1M tokens

Input price

55.0 credits / 1M tokens ($5.00 raw)

Output price

330 credits / 1M tokens ($30.00 raw)

Vision (image input)

Yes

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.10x margin. Raw prices shown per 1M tokens.

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What GPT-5.5 is best for

• Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
• Very long documents and codebases: a 1.1M-token window fits entire books or repositories in one conversation
• Working with images: screenshots, charts, photos and scanned documents alongside text
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a frontier model like GPT-5.5:

• Review this business plan and give me the three hardest questions an investor would ask
• Rewrite this announcement so it lands with both engineers and executives
• I am choosing between two job offers, help me think through the tradeoffs
• Draft a technical design doc for a rate limiter, including failure modes

OpenAI family

All 68 OpenAI models

Frequently asked questions

What is GPT-5.5?

GPT-5.5 is an AI model by OpenAI. GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...

How much does GPT-5.5 cost on Zeplik?

Input tokens cost 55.0 credits per million and output tokens 330 credits per million (1 credit = $0.10; the raw provider rates are $5.00 and $30.00 per million). New accounts start with free credits.

How long can a conversation with GPT-5.5 be?

GPT-5.5 has a 1.1M-token context window (1,050,000 tokens), which covers the conversation plus any documents you attach.

Does GPT-5.5 support images and tools?

GPT-5.5 accepts image input and supports tool calling.

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