OpenAI: Chat Latest (GPT-5.5 Instant) API
OpenAI: GPT-5.5 understands your intentions faster and can handle more work independently. It excels at writing and debugging code, conducting online research, analyzing data, creating documents and spreadsheets, operating software, and switching between different tools to complete tasks. Without the need for micromanagement of every step, you can delegate complex, multi-part tasks to OpenAI: GPT-5.5 and confidently let it plan, use tools, verify work, handle ambiguities, and continuously move forward until completion.
- Context window: 400,000 tokens
- Max output: 128,000 tokens
- Input: text, image
- Output: text
- Reasoning: Supported
- Tool calling: Supported
- File input: Supported
- Released: 2026-05-04
- Knowledge cutoff: 2025-08-30
Frequently Asked Questions
What is the context window of Chat Latest (GPT-5.5 Instant)?
Chat Latest (GPT-5.5 Instant) supports a context window of up to 400,000 tokens.
Does Chat Latest (GPT-5.5 Instant) support function calling?
Yes. Chat Latest (GPT-5.5 Instant) supports tool / function calling.
Does Chat Latest (GPT-5.5 Instant) support reasoning?
Yes. Chat Latest (GPT-5.5 Instant) is a reasoning-capable model.
What is the knowledge cutoff of Chat Latest (GPT-5.5 Instant)?
The knowledge cutoff of Chat Latest (GPT-5.5 Instant) is 2025-08-30.