o3 Pro
VerifiedOpenAI's o3 Pro handles complex multimodal tasks with 200k-token context.
About o3 Pro
o3 Pro was developed by OpenAI as a proprietary system without public weights. Its design centers on native multimodal support that processes text alongside images and files in a single session. The 200,000-token context window enables handling of lengthy documents and visual material together.
Strengths include seamless integration of different input modalities and sustained coherence over extended contexts. The model maintains consistent reasoning when users supply mixed data sources such as code files and diagrams. Closed weights ensure controlled access and regular updates from OpenAI.
Common usage covers research synthesis, technical documentation review, and visual data interpretation. Analysts and developers rely on it for tasks that combine written specifications with supporting images or attachments. It serves enterprise environments needing reliable multimodal assistance without open-source distribution.
Capabilities
How o3 Pro compares
o3 Pro (striped bar) vs other multimodal on intelligence, speed and price.
Price
USD per 1M output tokens · Lower is better · o3 Pro ranks #132 of 139
Sources: Artificial Analysis (intelligence, speed) · OpenRouter (price).
Best for
Long document analysis
o3 Pro handles extended inputs up to 200000 tokens, enabling thorough reasoning across large files, reports, or codebases in a single pass.
Multimodal research tasks
The model combines image interpretation with text analysis to review visual data alongside documents for integrated insights.
Complex software development
o3 Pro supports code generation, debugging, and iterative problem solving on substantial projects with file content processing.
Strengths & limitations
Strengths
- +Deep multi-step reasoning
- +Strong integration of text and visual inputs
- +Effective handling of large documents
- +Reliable file analysis
Limitations
- –Slower inference due to extended reasoning
- –No audio or video support
- –May produce overly detailed responses
Cost calculator
Estimate what o3 Pro would cost for your usage.
Based on o3 Pro's $20.00/1M input · $80.00/1M output. Estimate only — actual cost varies by provider and caching.
Quick start
OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. Only the model slug changes between models.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const completion = await client.chat.completions.create({
model: "openai/o3-pro",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(completion.choices[0].message.content);Model slug: openai/o3-pro
Editor's verdict
o3 Pro is OpenAI's proprietary multimodal with a 200K-token context window.
At $80.00 per 1M output tokens, it is premium-priced for its class.
It is available through OpenAI's API and aggregators like OpenRouter.
Best suited to deep multi-step reasoning and strong integration of text and visual inputs.
Frequently asked questions
o3 Pro supports a context window of 200000 tokens.
User reviews
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