OpenAI’s new frontier models mark a huge change in how AI will be built

I test-drove both. Here’s what I learned. In early March, OpenAI unleashed a one-two punch, dropping two major frontier models just days apart.

The new model offers performance improvements in reasoning, multimodal understanding and more.

OpenAI's new GPT-5.4 mini model offers performance improvements in reasoning, multimodal understanding and more.
Microsoft

CTI-REALM: A new benchmark for end-to-end detection rule generation with AI agents

CTI-REALM is Microsoft’s open-source benchmark that evaluates AI agents on real-world detection engineering. It measures whether an agent can take cyber threat intelligence (CTI) and produce validated ...

z.ai debuts faster, cheaper GLM-5 Turbo model for agents and 'claws' — but it's not open-source

Z.ai says GLM-5-Turbo is currently closed-source, but it also says the model’s capabilities and findings will be folded into its next open-source model release ...
Decrypt

OpenAI Releases GPT-5.4 Mini and Nano, Which Could Be More Useful Than the Big Model

OpenAI's new small models are faster and cheaper than GPT-5.4—exactly what developers and businesses actually need.