OpenAI: GPT-5.4 API
GPT‑5.4 brings together the best of our recent advances in reasoning, coding, and agentic workflows into a single frontier model. It incorporates the industry-leading coding capabilities of GPT‑5.3‑Codex while improving how the model works across tools, software environments, and professional tasks involving spreadsheets, presentations, and documents. The result is a model that gets complex real work done accurately, effectively, and efficiently—delivering what you asked for with less back and forth.
- 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: 2026-03-04
- Knowledge cutoff: 2025-08-30
Frequently Asked Questions
What is the context window of GPT-5.4?
GPT-5.4 supports a context window of up to 1,050,000 tokens.
Does GPT-5.4 support function calling?
Yes. GPT-5.4 supports tool / function calling.
Does GPT-5.4 support reasoning?
Yes. GPT-5.4 is a reasoning-capable model.
What is the knowledge cutoff of GPT-5.4?
The knowledge cutoff of GPT-5.4 is 2025-08-30.