OpenAI (OPENAI) revealed plans today to acquire Promptfoo, a startup that helps enterprises identify and correct vulnerabilities during the development of artificial intelligence systems. Promptfoo ...

Founded in 2024, Promptfoo began as an open-source framework for evaluating AI prompts and model behavior. It later expanded into a commercial platform used by developers and enterprise security teams ...

OpenAI is acquiring Promptfoo, the AI red-teaming startup used by 125k developers and 30+ Fortune 500 firms, to strengthen ...

Promptfoo raised $18.4 million in a Series A round in July 2025 led by Insight Partners with participation from Andreessen Horowitz, according to the company’s own announcement. Promptfoo said at the ...

Promptfoo provides tools that help companies identify vulnerabilities in AI systems during development, including issues such as prompt injections, data leaks and misuse of connected tools. Its ...

Investing.com -- OpenAI announced plans to acquire Promptfoo, an AI security platform that helps enterprises identify and fix vulnerabilities in AI systems during development. The company said it will ...

The AI startup said Promptfoo’s technology will be integrated into OpenAI Frontier, its platform designed for building and operating “AI ...

GPT-5.4 expands the context window to 1 million tokens; the larger limit supports longer coding and research sessions.