openai/gpt-5.5-proGPT-5.5 Pro is OpenAI’s proprietary AI model, released Apr 23, 2026. It costs $30/M input and $180/M output tokens, and handles a 1.1M-token context window. Its strongest use case is math, where it ranks in the 99th percentile of the models Model Beat tracks.
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads.
Scores on standardized evaluations. Higher is better — and rank shows where GPT-5.5 Pro lands among all models tracked on Model Beat.
Abstract visual reasoning
Harder abstract reasoning
Graduate-level scientific reasoning
Common-sense trick questions
Factual accuracy & hallucination
Olympiad-qualifier math
Research-level math problems
Hardest research math
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads.
GPT-5.5 Pro is an AI model developed by OpenAI, part of the GPT family, released Apr 23, 2026.
GPT-5.5 Pro's list price from OpenAI is $30 per million input tokens and $180 per million output tokens.
GPT-5.5 Pro supports a context window of up to 1.1M tokens.
On standardized evaluations tracked by Epoch AI, GPT-5.5 Pro scores 52.4% on FrontierMath, 39.6% on FrontierMath Tier 4, 100.0% on AIME 2024/2025.
GPT-5.5 Pro 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 Jul 30, 2026.