"Based on over 4,400 Java tasks, the report finds that depending on which of the four levels of reasoning capabilities that OpenAI now makes available, the overall quality of the code, especially in terms of the vulnerabilities generated, significantly improves. However, the overall volume of code being generated per task also substantially increases, which creates additional maintenance challenges for application developers that are not going to be familiar with how code might have been constructed in the first place."
"There are also plusses and minuses when it comes to security. For example, the report noted that higher reasoning eliminates common, well-understood attacks such as "path-traversal & injection" vulnerabilities. However, these are replaced by subtle, harder-to-detect flaws. The percentage of vulnerabilities related to "inadequate I/O error-handling" increases to 44% in the high reasoning mode versus 30% in the minimum reasoning mode."
Over 4,400 Java tasks across four reasoning levels show higher reasoning yields better code quality and fewer common vulnerabilities but generates substantially more code per task. The minimal GPT-5 edition produces more than twice the lines of code per task compared with GPT-4o. Higher reasoning removes path-traversal and injection flaws but increases inadequate I/O error-handling vulnerabilities to 44% versus 30% in minimal mode. Control-flow mistake bugs decline with higher reasoning, while concurrency/threading bugs rise from about 20% to roughly 38%. Pricing varies from $22 to $189 per developer per month, affecting cost versus benefit decisions.
Read at DevOps.com
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