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GPT-5.3 Chat

Conversational AI with structured outputs and tool calling support.

Context Window

128K tokens

≈ 96K words

Input Price

$1.75

per 1M tokens

Output Price

$14

per 1M tokens

Released

March 2026

Capabilities

Tool / Function calling

Best for

Chat-optimized model with reasoning and structured output support.

Strengths

  • Conversational AI
  • Microsoft integration
  • Enterprise
  • Productivity

API identifier

gpt-5.3-chat

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