Basic Information & Features

Model Class: o3-Pro is part of OpenAI’s “reasoning models,” designed to think step-by-step rather than generate immediate responses.
Availability: Accessible via ChatGPT Pro/Team interfaces and the OpenAI developer API as of June 10, 2025.
Access Tiers: Replaces the previous o1-Pro edition; Enterprise and Edu users onboard in the week following launch.

Technical Details

Architecture: Builds on the o3 backbone with an enhanced private chain of thought, enabling multi-step reasoning at inference.
Tokenization: Supports the same token schema as its predecessors—1 million input tokens ≈ 750,000 words.
Extended Capabilities: Includes web search, Python code execution, file analysis, and visual reasoning; image generation remains unsupported in this release.

Benchmark Performance

Math & Science: Surpassed Google Gemini 2.5 Pro on the AIME 2024 contest, demonstrating superior problem-solving in advanced mathematics.
PhD-Level Science: Outperformed Anthropic’s Claude 4 Opus on the GPQA Diamond benchmark, indicating robust expertise in scientific domains.
Enterprise Use: Internal tests report consistent wins over predecessor models across coding, STEM, and business reasoning tasks.

Technical Indicators

Latency: Response times are higher than o1-Pro—reflecting the deeper reasoning chains—averaging 1.5× the previous latency.
Throughput: Sustained token-generation throughput of up to 10 tokens/sec in burst mode.

With its enhanced reasoning chains, expanded feature set, and leading benchmark performance, o3-Pro represents a significant step forward in reliable, high-precision AI.

How to access o3-pro API

Log in to cometapi.com. If you are not our user yet, please register first. Sign into your CometAPI console. Get the access credential API key of the interface. Click “Add Token” at the API token in the personal center, get the token key: sk-xxxxx and submit.

Step 2: Send Requests to o3-pro API

Select the “\**o3-pro\**” endpoint to send the API request and set the request body. The request method and request body are obtained from our website API doc. Our website also provides Apifox test for your convenience. Replace <YOUR_API_KEY> with your actual CometAPI key from your account.

Insert your question or request into the content field—this is what the model will respond to . Process the API response to get the generated answer.

Step 3: Retrieve and Verify Results

Process the API response to get the generated answer. After processing, the API responds with the task status and output data.

O3 Pro