o3 Deep Research

OpenAI · Released October 2025

o3-deep-research is OpenAI's advanced model for deep research, designed to tackle complex, multi-step research tasks. Note: This model always uses the 'web_search' tool which adds additional cost.

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

200K tokens

Input price

110 credits / 1M tokens ($10.00 raw)

Output price

440 credits / 1M tokens ($40.00 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 o3 Deep Research is best for

• Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
• Long documents: the 200K-token window holds lengthy reports, contracts or papers whole
• 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 o3 Deep Research:

• 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 o3 Deep Research?

o3 Deep Research is an AI model by OpenAI. o3-deep-research is OpenAI's advanced model for deep research, designed to tackle complex, multi-step research tasks. Note: This model always uses the 'web_search' tool which adds additional cost.

How much does o3 Deep Research cost on Zeplik?

Input tokens cost 110 credits per million and output tokens 440 credits per million (1 credit = $0.10; the raw provider rates are $10.00 and $40.00 per million). New accounts start with free credits.

How long can a conversation with o3 Deep Research be?

o3 Deep Research has a 200K-token context window (200,000 tokens), which covers the conversation plus any documents you attach.

Does o3 Deep Research support images and tools?

o3 Deep Research accepts image input and supports tool calling.

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