GPT-5.4 Thinking

The most advanced GPT-5 model for complex professional work, reasoning, coding, tool use, and long-context tasks.

Technical specification

Context window

1,050,000 tokens

License

Proprietary (commercial; available via OpenAI services under Terms of Use / Services Agreement)

Tools

Yes

Last updated: Mar 14, 2026

Modalities

Input

Text

Image

Documents

Output

Code

reports

Structured data

summaries

Text

Capabilities

Reasoning★

Reasoning

Multi-step reasoning★

Reasoning

Long context★

Reasoning

Coding★

Coding

Function Calling

Planning

Structured output★

Structured gen.

Image understanding★

Vision

OCR★

Vision

Multilingual★

Language

Planning★

Planning

Streaming output

Reasoning

Applications

Security and enterprise

GPT-5.4 Thinking inherits the publicly documented platform-level security measures of OpenAI. Enterprise and security information is documented primarily for the API, ChatGPT Enterprise, Business, and Edu tiers, rather than as a separate security profile for the Thinking variant.

Technical information

It should be noted in the catalog that the security information reflects platform-level inherited security, not benchmark security of a specific model variant.

Official Privacy CenterUpdated: March 15, 2026