OpenAI: GPT-5.2 Pro API
The "Expert-tier" flagship model released by OpenAI in December 2025. As the most advanced version in the GPT-5.2 series, it unifies multimodal and reasoning capabilities while introducing the exclusive xhigh reasoning effort level. Excelling in legal modeling, frontier scientific research, and complex architecture design, it reduces hallucinations by approximately 30% compared to GPT-5.
- Context window: 400,000 tokens
- Max output: 128,000 tokens
- Input: text, image
- Output: text
- Reasoning: Supported
- Tool calling: Supported
- File input: Supported
- Released: 2025-12-11
- Knowledge cutoff: 2025-08-31
Frequently Asked Questions
What is the context window of GPT-5.2 Pro?
GPT-5.2 Pro supports a context window of up to 400,000 tokens.
Does GPT-5.2 Pro support function calling?
Yes. GPT-5.2 Pro supports tool / function calling.
Does GPT-5.2 Pro support reasoning?
Yes. GPT-5.2 Pro is a reasoning-capable model.
What is the knowledge cutoff of GPT-5.2 Pro?
The knowledge cutoff of GPT-5.2 Pro is 2025-08-31.