OpenAI o3 is the most advanced reasoning model from OpenAI, purpose-built for handling complex, high-cognition tasks. Launched in April 2025, it delivers exceptional performance in software engineering, mathematics, and scientific problem-solving. The model introduces three levels of reasoning effort—low, medium, and high—allowing users to balance between latency and depth of reasoning based on task complexity. o3 supports essential tools for developers, including function calling, structured outputs, and system-level messaging. With built-in vision capabilities, o3 can interpret and analyze images, making it suitable for multimodal applications. It’s available through Chat Completions API, Assistants API, and Batch API for flexible integration into enterprise and research workflows.
| o3 | GPT-4.1 Nano | |
|---|---|---|
Provider | ||
Web Site | ||
Release Date | Apr 16, 2025 3 weeks ago | Apr 14, 2025 3 weeks ago |
Modalities | text images | text images |
API Providers | OpenAI API | OpenAI API |
Knowledge Cut-off Date | - | - |
Open Source | No | No |
Pricing Input | $10.00 per million tokens | $0.10 per million tokens |
Pricing Output | $40.00 per million tokens | $0.40 per million tokens |
MMLU | 82.9% Source | 80.1% Source |
MMLU Pro | - | - |
MMMU | - | 55.4% Source |
HellaSwag | - | - |
HumanEval | - | - |
MATH | - | - |
GPQA | 83.3% Diamond, no tools Source | 50.3% Diamond Source |
IFEval | - | 74.5% Source |
Array | - | - |
AIME 2024 | 91.6% Source | 29.4% Source |
AIME 2025 | 88.9% Source | - |
Array | - | - |
Array | - | - |
Array | - | 66.9% Source |
Array | - | 56.2% Image Reasoning Source |
Mobile Application |
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