OpenAI: GPT-4o (extended)
Analysis Summary
GPT-4o extended is listed as a text, image, and file model with vision, tool use, function calling, and a 128K context window. The supplied record includes no benchmark data specific to this variant, so its reasoning, coding, and instruction-following performance cannot be inferred from the separate GPT-4o entry. Its listed input and output prices are higher than the standard GPT-4o entry in this batch.
The feature list could support document and image workflows, but teams should verify that this variant behaves as expected before connecting it to client processes. It is not a preferred choice for new deployments without evidence that its extended variant offers a workflow benefit. Run a controlled comparison with the benchmarked GPT-4o and less expensive options, including checks for output consistency and tool execution, before putting it into production.
Assessed September 23, 2026
Editorial notes
GPT-4o extended lists vision, file input, tool use, function calling, and a 128K context window, but has no model-specific benchmark data and higher listed pricing.
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-4o extended lists vision, file input, tool use, function calling, and a 128K context window, but has no model-specific benchmark data and higher listed pricing.
How OpenAI: GPT-4o (extended) compares
Its 128K-token context window is larger than 36% of the models we list. At $6.00 per million input tokens it is cheaper than 3% 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 | $6.00 | $0.006000 |
| Output | $18.00 | $0.018000 |
What would OpenAI: GPT-4o (extended) 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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Talk to our teamAbout OpenAI: GPT-4o (extended)
GPT-4o ("o" for "omni") is OpenAI's latest AI model, supporting both text and image inputs with text outputs. It maintains the intelligence level of GPT-4 Turbo while being twice as..
Frequently asked questions about OpenAI: GPT-4o (extended)
How much does OpenAI: GPT-4o (extended) cost?
OpenAI: GPT-4o (extended) costs $6.00 per million input tokens and $18.00 per million output tokens.
What is the context window of OpenAI: GPT-4o (extended)?
OpenAI: GPT-4o (extended) has a context window of 128,000 tokens (128K).
What can OpenAI: GPT-4o (extended) do?
OpenAI: GPT-4o (extended) supports image/vision input, tool use, and function calling.
Who created OpenAI: GPT-4o (extended)?
OpenAI: GPT-4o (extended) is developed by OpenAI and was released on May 13, 2024.