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GPT-5.4
OpenAI's frontier model for complex professional work. Features 1.05M context window, 128k output tokens, and reasoning token support. Reasoning.effort supports: none (default), low, medium, high and xhigh.
Model Specifications
Context window
1,050,000 tokens
Max output
128,000 tokens
Knowledge cutoff
August 2025
Multipart messages
Yes
Vision capabilities
Yes
Default Parameters
Temperature
1.0
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