GPT-5.3 Chat
The build that ran ChatGPT for GPT-5.3. Tuned for conversation; answers straight away.
Use instead GPT-5.6 Sol →
Modalities
Context window
128,000 tokens, ≈ 96,000 words · about 380 pages
Max output
16,384 tokens, ≈ 12,000 words in a single answer
Knowledge cutoff
August 2025
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
- Tool searchNot supported
Features
- StreamingSupported
- Function callingSupported
- Structured outputsSupported
- Fine-tuningNot supported