openai/gpt-5.5GPT-5.5 is OpenAI’s proprietary AI model, released Apr 23, 2026. It costs $5/M input and $30/M output tokens, and handles a 1.1M-token context window. Its strongest use case is coding, where it ranks in the 84th percentile of the models Model Beat tracks.
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks.
Scores on standardized evaluations. Higher is better — and rank shows where GPT-5.5 lands among all models tracked on Model Beat.
Abstract visual reasoning
Harder abstract reasoning
Graduate-level scientific reasoning
Frontier of human expert knowledge
Common-sense trick questions
Factual accuracy & hallucination
Novel ML problem-solving
Code performance optimization
Scientific research coding
Real GitHub issue resolution
Human-rated web development
Olympiad-qualifier math
Research-level math problems
Hardest research math
Multi-step agentic tasks
Command-line agentic tasks
Tool-agent-user reliability
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks.
GPT-5.5 is an AI model developed by OpenAI, part of the GPT family, released Apr 23, 2026.
GPT-5.5's list price from OpenAI is $5 per million input tokens and $30 per million output tokens.
GPT-5.5 supports a context window of up to 1.1M tokens.
On standardized evaluations tracked by Epoch AI, GPT-5.5 scores 84.7% on Terminal-Bench, 51.7% on FrontierMath, 80.6% on SWE-bench Verified.
GPT-5.5 is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.
Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Sep 22, 2026.