GPT-5.4 Pro
Thinks for longer before answering, over very long documents. Built for hard problems, not chat or code.
Superseded by GPT-5.5 Pro →
Modalities
Context window
1,050,000 tokens, ≈ 788,000 words · about 3,150 pages
Max output
128,000 tokens, ≈ 96,000 words in a single answer
Knowledge cutoff
August 2025
Reasoning effort
Default: Medium
Providers
Files you can attach
- ImagesJPG, PNG, GIF, WEBP
- DocumentsPDF, DOCX, XLSX, PPTX
- Text and codeTXT, MD, CSV, TSV, RPT, LOG, PY, TS, TSX, JS, JSX, CS, GO, JAVA, KT, SWIFT, CPP, C, H, PHP, RB, SQL, SH, PS1, HTML, CSS, SCSS, JSON, YAML, YML, XML, INI
Tools
- Web searchSupported
- File searchSupported
- Image generationSupported
- Code interpreterNot supported
- Hosted shellNot supported
- Apply patchSupported
- SkillsNot supported
- Computer useSupported
- MCPSupported
- Tool searchSupported
Features
- StreamingNot supported
- Function callingSupported
- Structured outputsNot supported
- Fine-tuningNot supported