OpenAI: GPT-5.5 API
GPT-5.5 by OpenAI. 1,050,000 token context. Call it via ePhone AI's unified API.
- Context window: 1,050,000 tokens
- Max output: 128,000 tokens
- Input: text, image
- Output: text
- Reasoning: Supported
- Tool calling: Supported
- File input: Supported
- Released: 2026-04-23
- Knowledge cutoff: 2025-11-30
Frequently Asked Questions
What is the context window of GPT-5.5?
GPT-5.5 supports a context window of up to 1,050,000 tokens.
Does GPT-5.5 support function calling?
Yes. GPT-5.5 supports tool / function calling.
Does GPT-5.5 support reasoning?
Yes. GPT-5.5 is a reasoning-capable model.
What is the knowledge cutoff of GPT-5.5?
The knowledge cutoff of GPT-5.5 is 2025-11-30.