OpenAI has announced the acquisition of cybersecurity start-up Promptfoo, which specializes in tools for testing and securing artificial intelligence systems. The financial terms of the deal were not disclosed. Promptfoo's team will join OpenAI, and its technology will be integrated into the Frontier platform, dedicated to developing AI agents capable of interacting with real-world systems and data.

Promptfoo develops tools that allow companies to test prompts, assess the reliability of AI agents, and compare the performance of different models such as GPT, Anthropic's Claude or Google's Gemini. According to its chief executive, Ian Webster, the integration is expected to accelerate the rollout of advanced security, governance and validation capabilities for AI applications deployed in production.

OpenAI also said it would continue to support Promptfoo's open-source project, widely used by developers. The start-up, which has 11 employees, had raised a total of $22.68m, including $18.4m in a funding round led by Insight Partners in July, at a valuation of about $85.5m, according to PitchBook.