OpenAI: GPT-5.3 Chat
Analysis Summary
OpenAI's GPT-5.3 Chat is listed with a 128K context window, image and file input, vision, and support for tools and function calling. These features make it a plausible fit for conversational workflows that need to work with documents or call external services. The supplied record does not include benchmark results for this specific variant, so its reasoning, coding, and tool-use reliability remain unverified.
Its listed input and output rates are $1.75 and $14. That price makes it important to establish quality before choosing it for routine traffic, particularly when cheaper alternatives are available. Teams should compare it with measured models on actual content, document, and tool-use tasks before deployment. Treat it as an evaluation candidate rather than a proven upgrade, and avoid assigning it critical client work without a reliability test.
Assessed September 23, 2026
Editorial notes
GPT-5.3 Chat lists vision, file input, tools, and function calling, but no benchmark results for this variant are provided. Its 128K context and listed rates support evaluation, not an assumed production advantage.
The DFO score ranks models on the Artificial Analysis Intelligence Index and is refreshed as new models launch. The write-up and verdict are our own. Feedback?
DFO Verdict
GPT-5.3 Chat lists vision, file input, tools, and function calling, but no benchmark results for this variant are provided. Its 128K context and listed rates support evaluation, not an assumed production advantage.
How OpenAI: GPT-5.3 Chat compares
Its 128K-token context window is larger than 37% of the models we list. At $1.75 per million input tokens it is cheaper than 17% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.75 | $0.001750 |
| Output | $14.00 | $0.014000 |
What would OpenAI: GPT-5.3 Chat cost your business?
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A website chatbot handling around 100 customer conversations a day, a few short messages each.
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These numbers get smaller with the right architecture.
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Talk to our teamAbout OpenAI: GPT-5.3 Chat
GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. It delivers more accurate answers with better contextualization and significantly..
Frequently asked questions about OpenAI: GPT-5.3 Chat
How much does OpenAI: GPT-5.3 Chat cost?
OpenAI: GPT-5.3 Chat costs $1.75 per million input tokens and $14.00 per million output tokens.
What is the context window of OpenAI: GPT-5.3 Chat?
OpenAI: GPT-5.3 Chat has a context window of 128,000 tokens (128K).
What can OpenAI: GPT-5.3 Chat do?
OpenAI: GPT-5.3 Chat supports image/vision input, tool use, and function calling.
Who created OpenAI: GPT-5.3 Chat?
OpenAI: GPT-5.3 Chat is developed by OpenAI and was released on March 3, 2026.