GPT-5.3 Chat
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OpenAIOpenAIGPT ModeratedReleased 2026-03-03

GPT-5.3 Chat

128K context$1.75/M input$14.00/M output

GPT-5.3 Chat is an updated version of OpenAI's ChatGPT model, designed to enhance conversational flow by providing more accurate answers and better contextualization. It reduces unnecessary refusals and overly cautious phrasing, making everyday conversations smoother and more helpful. The model supports a large context window of 128,000 tokens, enabling extended interactions.

What is GPT-5.3 Chat?

GPT-5.3 Chat is an AI model from OpenAI that Agent Mag tracks for pricing, context window, modalities, benchmarks, and API compatibility. Builders can use this page to compare GPT-5.3 Chat against other models for agent workflows and production deployments.

Model ID

GPT-5.3 Chat is an updated version of OpenAI's ChatGPT model, designed to enhance conversational flow by providing more accurate answers and better contextualization. It reduces unnecessary refusals and overly cautious phrasing, making everyday conversations smoother and more helpful. The model supports a large context window of 128,000 tokens, enabling extended interactions.

Architecture & Specifications
Tokenizer
GPT
License
Proprietary
Released
2026-03-03
Modalities
Input
textimagefile
Output
text
Supported Parameters
max_completion_tokensmax_tokensresponse_formatseedstructured_outputstool_choicetools
Strengths
  • Improved conversational flow
  • Better contextualization of responses
  • Reduced unnecessary refusals and cautious phrasing
  • Supports large context window of 128,000 tokens
Recommended Use Cases
Everyday conversations
Extended chat interactions
Providing accurate and contextualized answers

Related content

Data enriched Apr 24, 2026. Pricing from OpenRouter API.