o3 Pro

OpenAI · Released June 2025 · Knowledge cutoff June 2024

The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning.

It is part of OpenAI's GPT family, where GPT-6 Astra leads, GPT-6 Sol and GPT-6 Luna cover the capability and speed tiers below it, the GPT-5.6 generation sits behind them, and Pro servings trade speed for deeper computation.

Facts and pricing

Provider

OpenAI

Context window

200K tokens

Input price

240 credits / 1M tokens ($20.00 raw)

Output price

960 credits / 1M tokens ($80.00 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 1.20x margin. Raw prices shown per 1M tokens.

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What o3 Pro 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 Pro:

• 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 71 OpenAI models

Model comparisons

• Claude Opus 5.5 vs GPT-6 Astra
• Claude Opus 5.5 vs GPT-6 Sol
• GPT-6 Sol vs GPT-5.6 Sol
• GPT-6 Sol vs GPT-6 Astra

Frequently asked questions

What is o3 Pro?

o3 Pro is an AI model by OpenAI. The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning.

How much does o3 Pro cost on Zeplik?

Input tokens cost 240 credits per million and output tokens 960 credits per million (1 credit = $0.10; the raw provider rates are $20.00 and $80.00 per million). New accounts start with free credits.

How long can a conversation with o3 Pro be?

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

Does o3 Pro support images and tools?

o3 Pro accepts image input and supports tool calling.

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