GPT-5.3 Chat (latest) by OpenAI | AI model information

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Model details

GPT-5.3 Chat (latest)

GPT-5.3 Chat is positioned as OpenAI's everyday conversational model, designed to make routine interactions smoother, more direct, and more useful than its predecessor. Rather than targeting deep reasoning, the "Instant"-style design focuses on conversational flow, relevant tone, and quick helpful responses, addressing prior complaints about excessive refusals, unnecessary disclaimers, and overly cautious replies. This makes it a strong fit for general-purpose chat, creative writing, and web-enhanced question answering, while more demanding reasoning or coding workloads remain better served by OpenAI's specialized models.

The model accepts text, image, and document input and produces text output, with native support for tool calling, tool choice, structured output, and streaming, making it straightforward to drop into agent pipelines and structured workflows. A 128,000-token context window paired with a 16,384-token maximum output gives it room for long conversations and document-grounded tasks, and pricing sits at a level suited to high-volume interactive use. In practice, GPT-5.3 Chat is best understood as the approachable, production-ready default for customer-facing assistants and developer applications that prioritize responsiveness and reliability over heavyweight reasoning.

OpenAIgpt-5.3-chat-latestgpt

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Quick Info

Provider: OpenAI
Model key: gpt-5.3-chat-latest
Release date: Mar 3, 2026
Last updated: Mar 3, 2026
Knowledge cutoff: 2025-08-31
Input modalities
Output modalities
Capabilities

Cost

Input token cost: $1.75
Output token cost: $14.00

Limits

Output tokens: 16,384 tokens
Context window: 128,000 tokens

Latest news about GPT-5.3 Chat (latest)

OpenAI

Coverage

EdTech Innovation Hub reported on March 6, 2026 that OpenAI began rolling out GPT-5.3 Instant as the default everyday model in ChatGPT, naming the developer-facing API alias gpt-5.3-chat-latest under which the update is exposed. The article cites a LinkedIn announcement by Nick Turley explaining that the release target The same piece specifies that GPT-5.2 Instant will remain accessible to paid users in the model picker under Legacy Models for three months before retirement on June 3, 2026, giving API consumers a concrete migration deadline. For developers building on the gpt-5.3-chat-latest endpoint, this means planning a switch awa

OpenAI

Official sourceRelease Notes

The OpenAI API changelog serves as the canonical authoritative surface for model and platform changes affecting OpenAI developers, with current August 2026 entries covering regional request routing via prefixed domains (Aug 21), a 20% input and 33% output price cut on gpt-5.6-sol to $4/$20 per million tokens (Aug 21), The captured excerpt does not contain a dedicated gpt-5.3-chat-latest changelog row, so it does not by itself confirm any API-side change specific to the subject model, but it does demonstrate that the OpenAI API surface has progressed to GPT-5.6 line items and new platform tooling like the Prompt Caching dashboard by

OpenAI

Coverage

GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. $1.75 per million input tokens, $14 per million output tokens. 128,000 token context window, maximum output of 16,384 tokens. Higher uptime with 2 providers.