OpenAI introduces GPT-5.5 and GPT-5.5 Pro models along with various API updates

Apr 24, 2026

AI Summary

OpenAI has launched GPT-5.5 and GPT-5.5 Pro, enhancing capabilities for complex tasks and API requests. The updates include new models for image generation, improved SDK features, and expanded API functionalities aimed at optimizing performance and user experience.

OpenAI released GPT-5.5 and GPT-5.5 Pro, designed for complex professional tasks and demanding API requests, respectively.
GPT-5.5 features a 1 million token context window, image input, structured outputs, and various advanced functionalities such as function calling and web search.
The company also introduced GPT Image 2, an advanced model for image generation and editing, which supports flexible image sizes and offers a 50% discount for Batch API usage.
Updates to the Agents SDK include new capabilities, and the release of GPT-5.4 mini and nano models optimized for speed and efficiency in high-volume tasks.
The API now supports a wider range of input file types and includes new features like the phase label for assistant messages and WebSocket mode for improved real-time interactions.
OpenAI has also launched several new models, including gpt-5.3-chat-latest and gpt-5.2-codex, and introduced enhanced role-based access controls and custom tool call types.
The Realtime API is now generally available, providing improved performance and features for real-time applications, along with new models for audio and video generation.

openaigpt-5.5apilanguage modelsai tools

OpenAI introduces GPT-5.5 and GPT-5.5 Pro models along with various API updates

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