GPT 5.3 Chat

gpt-5.3-chat-latest · OpenAI

GPT-5.3Chat refers to the GPT-5.3 snapshot currently used in ChatGPT and is optimized for conversational use cases. While GPT-5.2 is recommended for most API applications, GPT-5.3Chat is ideal for testing the latest improvements in chat-based interactions.

API Pricing

Input$1.75 / 1M tokens
Output$14 / 1M tokens
Cache read$0.175 / 1M tokens

Specifications

Context128K tokens
Modalitiestext, image
CapabilitiesStreaming, Tool calling, Web search, Code interpreter, File search, Structured outputs, Prompt caching

Frequently asked questions

What is GPT 5.3 Chat?

GPT-5.3Chat refers to the GPT-5.3 snapshot currently used in ChatGPT and is optimized for conversational use cases. While GPT-5.2 is recommended for most API applications, GPT-5.3Chat is ideal for testing the latest improvements in chat-based interactions.

What is the context length of GPT 5.3 Chat?

GPT 5.3 Chat has a 128,000 token context window.

How much does GPT 5.3 Chat cost?

On AIHubMix, GPT 5.3 Chat costs $1.75 per million input tokens and $14 per million output tokens. Cached input reads are billed at $0.175 per million tokens.

What modalities does GPT 5.3 Chat support?

GPT 5.3 Chat accepts text and image input.

What capabilities does GPT 5.3 Chat support?

GPT 5.3 Chat supports function calling and structured outputs. Per-protocol parameter support is listed in the capability table on this page.

How do I call GPT 5.3 Chat via API?

GPT 5.3 Chat is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to gpt-5.3-chat-latest — no other code changes needed.

Who created GPT 5.3 Chat?

GPT 5.3 Chat is developed by OpenAI. AIHubMix aggregates it alongside models from other providers behind one API and one bill.

When was GPT 5.3 Chat released?

GPT 5.3 Chat was released on March 3, 2026 by OpenAI.

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Use GPT 5.3 Chat via the AIHubMix unified API — one interface for every major LLM.