GPT-5.5

Model Overview

GPT-5.5 (internally codenamed "Spud") is an advanced AI model developed by OpenAI, officially released on April 23, 2026. Billed as a "new class of intelligence for coding and professional work," it represents a major architectural update—the first fully retrained base model since GPT-4.5. GPT-5.5 features a unified omnimodal architecture capable of natively processing text, images, audio, and video without relying on separate specialized models.

Capabilities

• Agentic Workflows: Designed specifically for complex, multi-step agentic tasks. It can understand high-level goals, plan processes, and use tools such as browsers and computer applications autonomously.
• Omnimodal Processing: Natively handles multimodal inputs (text, image, audio, video) seamlessly.
• Self-Verification: Capable of verifying its own work, heavily reducing the need for constant human intervention.
• Large Context Window: Supports an extensive 1M+ token context window.
• Hardware Co-design: Maintains per-token latency comparable to GPT-5.4 due to optimization with NVIDIA's GB200/300 systems.

Example Use Cases

• Autonomous agentic coding tasks requiring minimal human oversight.
• Complex data analysis and reasoning over large codebases (leveraging the 1M+ token context window).
• Seamless multimodal interaction handling image, audio, and text simultaneously in real-time environments.

Performance & Benchmarks

At its release, GPT-5.5 showcased state-of-the-art results:

• Terminal-Bench 2.0: 82.7%, outperforming leading competitors like Claude Opus 4.7 at the time.
• OSWorld-Verified: 78.7%, edging out human baselines and competing frontier models.
• FrontierMath (Tiers 1–3): 51.7%.

Intended Use & Limitations

Intended Use: Aimed at developers and professionals requiring autonomous reasoning, complex coding, and large-scale multimodal processing. Limitations: While highly capable, it has since been succeeded by the GPT-5.6 family (Sol, Terra, Luna) which offers superior intelligence, efficiency, and lower latency for more cost-sensitive or complex workloads.

About OpenAI

OpenAI is an AI research and deployment company dedicated to ensuring that artificial general intelligence (AGI) benefits all of humanity.