Cloudflare Clef-flash hits 39 milliseconds, outpacing Jev

Cloudflare has mainly been known for its global network for content delivery, DNS, and security services, and its recent AI headlines have centered on giving website owners control over access, such as letting site operators block or allow AI bots based on their purpose in July. Clef marks a shift toward Cloudflare's own AI models, aimed at a niche between large language models, which can reason and call tools but vary in output and can be slow, and traditional classifiers, which are fast but need retraining for every new category.

The approach was popularized by TypeSafe AI, the startup founded by former OpenAI researcher Diogo Almeida, which introduced Jev in mid-September and markets it as a model "without hallucinations" — though that only guarantees it stays within predefined answer options and doesn't prevent it from choosing incorrectly. In late September, OpenAI followed with a Decisions API built on GPT-6 Luna that also accepts context as text or images. Cloudflare keeps its API fully compatible with Jev so customers can switch easily, and it built Clef on Qwen models while leaving the base models unchanged and training extra components on its own synthetic data.

The stakes likely hinge on whether Cloudflare's self-reported benchmarks survive outside scrutiny, and on how quickly the planned self-service fine-tuning platform arrives, since the launch version relies on forward deployed engineers working directly with customers. Buyers weighing a switch from Jev gain from the compatible API, but the real test is whether the latency and accuracy advantages hold on their own tasks rather than on Cloudflare's.