GPT-5.5
OpenAI's new default frontier model — sharper reasoning, native computer use, and a major leap in long-context retrieval at matched GPT-5.4 latency
GPT-5.5
OpenAI • April 2026
Training Data
Not disclosed
GPT-5.5
April 2026
Parameters
Not disclosed
Training Method
Token-Efficient Unified Architecture
Context Window
1,000,000 tokens
Knowledge Cutoff
Not disclosed
Key Features
1M Token Context • Native Computer Use • Token-Efficient Reasoning • Agentic Coding
Capabilities
Professional Tasks: Outstanding (84.9% GDPval)
Coding: Maximum (58.6% SWE-Bench Pro)
Long-Context: Exceptional (74.0% MRCR 512K–1M)
What's New in This Version
Matches GPT-5.4 per-token latency with fewer tokens needed, and doubles long-context retrieval (74.0% vs 36.6% on MRCR 512K–1M)
OpenAI's new default frontier model — sharper reasoning, native computer use, and a major leap in long-context retrieval at matched GPT-5.4 latency
What's New in This Version
Matches GPT-5.4 per-token latency with fewer tokens needed, and doubles long-context retrieval (74.0% vs 36.6% on MRCR 512K–1M)
Technical Specifications
Key Features
Capabilities
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