Devoured - April 24, 2026
GPT 5.5 (18 minute read)

GPT 5.5 (18 minute read)

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OpenAI released GPT-5.5, a new language model with enhanced agentic reasoning and tool use that improves coding performance without increasing latency.

What: GPT-5.5 is OpenAI's latest model release featuring improvements in agentic reasoning, tool use, and efficiency, with better performance on coding and knowledge tasks while maintaining the same response speed as previous versions.
Why it matters: This matters for developers building AI-powered applications, as improved agentic capabilities and tool use suggest better autonomous task completion, while maintained latency means production systems won't need performance adjustments.
Decoder
  • Agentic reasoning: The ability of an AI model to autonomously plan, execute multi-step tasks, and make decisions toward goals without constant human guidance
Original article

OpenAI released GPT-5.5 with improved agentic reasoning, tool use, and efficiency, matching prior latency while increasing performance across coding and knowledge tasks.