#OpenAIReleasesGPT-5.5

The release of GPT-5.5 on April 23, 2026, marks a pivotal shift toward fully agentic AI. Codenamed "Spud," this model is OpenAI’s first fully retrained base model since GPT-4.5, specifically architected for autonomous, multi-step execution rather than simple text prediction. With a massive 1M-token context window, GPT-5.5 can ingest entire codebases or dense document libraries, excelling in "agentic coding" and "computer use"—the ability to navigate interfaces and use tools with human-like precision.
Benchmarks highlight its dominance; it scores 84.9% on GDPval, outperforming Claude 4.7 and Gemini 3.1 Pro in professional knowledge work. While OpenAI introduced GPT-5.5 Pro for high-stakes reasoning, the standard 5.5 model focuses on speed and efficiency, matching the latency of its predecessors despite its increased intelligence. This launch effectively redefines AI as a proactive collaborator rather than a passive assistant.