OpenAI: GPT-5.1-Codex-Max

GPT-5.1-Codex-Max, OpenAI's latest agentic coding model, demonstrates exceptional reliability with a 99% success rate across benchmarks, consistently providing usable responses. While its speed performance is moderate, ranking in the 29th percentile, its pricing tends to be premium, positioned at the 6th percentile. The model exhibits significant strengths in several key areas. It achieves perfect accuracy in both General Knowledge and Ethics benchmarks, with the former also noted as the most accurate model at its price point and speed. Instruction Following and Coding also show strong performance, ranking in the 93rd and 91st percentiles respectively. Mathematics performance is solid at 93% accuracy. A notable weakness is observed in Hallucinations, where its 88% accuracy places it in the 34th percentile, indicating room for improvement in acknowledging uncertainty. Despite its premium cost, the model's high accuracy in critical areas like coding, general knowledge, and ethical reasoning, combined with its robust reliability, positions it as a powerful tool for complex, long-running software development tasks.