GPT-5.5
GPT-5.5 is a multimodal text generation model from OpenAI with a 1,000,000-token context window and adjustable reasoning effort.
OpenAIFlagship reasoning with multimodal and large context
GPT-5.5 is a large language model developed by OpenAI, released in April 2026. It supports text and image inputs, offers a context window of up to one million tokens, and can generate responses up to 128,000 tokens in length. The model includes a configurable reasoning effort setting, allowing users to adjust how much computation the model applies to a given task.
GPT-5.5 is suited for tasks that require processing long documents, analyzing images alongside text, or working through complex multi-step problems. Its tool-use support makes it applicable to agentic workflows where the model needs to call external functions or APIs. The large context window is particularly useful for applications involving lengthy codebases, legal documents, or extended conversations.
What GPT-5.5 supports
Large Context Window
Processes up to 1,000,000 tokens of input in a single request, enabling analysis of long documents, codebases, or extended conversations without truncation.
Adjustable Reasoning
Exposes a reasoning effort selector that lets users control how much computation the model applies, balancing thoroughness against response time.
Image Understanding
Accepts image inputs alongside text, supporting tasks such as document analysis, diagram interpretation, and visual question answering.
Tool Use
Supports function calling and external tool integration, making it applicable to agentic pipelines that require structured API interactions.
Long-Form Output
Can generate responses up to 128,000 tokens, suitable for producing detailed reports, full code files, or extended structured documents.
Multimodal Input
Combines text and image modalities in a single prompt, allowing mixed-media tasks to be handled within one unified model call.
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Get Started FreeCommon questions about GPT-5.5
What is the context window size for GPT-5.5?
GPT-5.5 supports a context window of 1,000,000 tokens, meaning it can process up to one million tokens of combined input and conversation history in a single request.
What is the maximum response length GPT-5.5 can produce?
The model can generate responses of up to 128,000 tokens in a single output, which is suitable for long-form documents, detailed code, or extended structured content.
Does GPT-5.5 support image inputs?
Yes. GPT-5.5 accepts image inputs alongside text, enabling tasks such as visual question answering, diagram analysis, and document understanding.
What does the reasoning effort setting do?
The reasoning effort input lets you select how much computation the model applies when generating a response. Higher effort may improve accuracy on complex tasks; lower effort can reduce latency.
What is the pricing for GPT-5.5?
Pricing information for GPT-5.5 was not published in the available metadata. Check the OpenAI pricing page or MindStudio's model catalog for current rate information.
When was GPT-5.5 released?
GPT-5.5 was released in April 2026 and was added to the MindStudio model catalog on April 24, 2026.
Parameters & options
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