OpenAI: o3 API
The next-generation flagship model in OpenAI's reasoning series and successor to o1. It sets new benchmarks in math, science, coding, and visual reasoning, offering frontier-level intelligence with significantly improved cost-efficiency through optimized architecture.
- Context window: 200,000 tokens
- Max output: 100,000 tokens
- Input: text, image
- Output: text
- Reasoning: Supported
- Tool calling: Supported
- File input: Supported
- Released: 2025-04-16
- Knowledge cutoff: 2024-04-30
Frequently Asked Questions
What is the context window of o3?
o3 supports a context window of up to 200,000 tokens.
Does o3 support function calling?
Yes. o3 supports tool / function calling.
Does o3 support reasoning?
Yes. o3 is a reasoning-capable model.
What is the knowledge cutoff of o3?
The knowledge cutoff of o3 is 2024-04-30.