GP
Parameters
No data
Context length
1M
Multilingual
Supported
Reasoning ability
4/5
GPT-5.3 is an AI model published by OpenAI, released on 2026-02-20, for Foundation model, and 1M context length.
Data sourced primarily from official releases (GitHub, Hugging Face, papers), then benchmark leaderboards, then third-party evaluators. Learn about our data methodology
GPT-5.3
Model basics
Reasoning traces
Supported
Thinking modes
Thinking Level · Medium (Default)Thinking Level · LowThinking Level · HighThinking Level · Extra-High
Context length
1M tokens
Max output length
No data
Model type
Foundation model
Modality (in / out)
Text, Image → Text
Release date
2026-02-20
Model file size
No data
MoE architecture
No
Total params / Active params
No data / Not applicable
Knowledge cutoff
No data
GPT-5.3
Open source & experience
Code license
Proprietary
Weights license
Proprietary
GitHub repo
N/A
Hugging Face
N/A
Live demo
N/A
GPT-5.3
Official resources
Paper
N/A
DataLearnerAI blog
N/A
GPT-5.3
API details
API speed
3/5
No public API pricing yet.
GPT-5.3
Publisher
OpenAI
View publisher details GPT-5.3
Model Overview
GPT-5.3 is an AI model published by OpenAI, released on 2026-02-20, for Foundation model, and 1M context length.
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