OpenAI: GPT-5.5 Pro
Analysis Summary
OpenAI GPT-5.5 Pro is listed with a 1.05M context window, image and file input, vision, and tool and function calling. The entry provides no model-specific benchmark results, so its actual reasoning, coding, writing, and agentic performance cannot be verified here. Its listed features make it suitable for structured testing on long documents and multimodal tasks, but they do not establish that it outperforms benchmarked alternatives.
The listed price of $30 per million input tokens and $180 per million output tokens is very high. That cost would require clear quality advantages on high-value work to justify routine adoption, and the supplied data does not demonstrate those advantages. It is not a sensible default for bulk content or high-volume automation based on the information available.
Do not select it on the Pro label alone. First test it against measured models on the agency's most demanding document, vision, and tool-use tasks, then reserve use for cases where the results justify the premium.
Assessed September 23, 2026
Editorial notes
GPT-5.5 Pro lists a 1.05M context window, vision, file input, and tool and function calling, but no model-specific benchmarks are provided and its listed token prices are very high.
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-5.5 Pro lists a 1.05M context window, vision, file input, and tool and function calling, but no model-specific benchmarks are provided and its listed token prices are very high.
How OpenAI: GPT-5.5 Pro compares
Its 1.1M-token context window is larger than 98% of the models we list. At $30.00 per million input tokens it is cheaper than 1% 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 | $30.00 | $0.030000 |
| Output | $180.00 | $0.180000 |
What would OpenAI: GPT-5.5 Pro 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.
We route routine calls to cheap models and save OpenAI: GPT-5.5 Pro for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout OpenAI: GPT-5.5 Pro
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for..
Frequently asked questions about OpenAI: GPT-5.5 Pro
How much does OpenAI: GPT-5.5 Pro cost?
OpenAI: GPT-5.5 Pro costs $30.00 per million input tokens and $180.00 per million output tokens.
What is the context window of OpenAI: GPT-5.5 Pro?
OpenAI: GPT-5.5 Pro has a context window of 1,050,000 tokens (1.1M).
What can OpenAI: GPT-5.5 Pro do?
OpenAI: GPT-5.5 Pro supports image/vision input, tool use, and function calling.
Who created OpenAI: GPT-5.5 Pro?
OpenAI: GPT-5.5 Pro is developed by OpenAI and was released on April 24, 2026.