GPT-5.4 Mini and Nano Hit OpenRouter on March 18 — Speed/Cost Variants for Agent Pipelines

Labla.org / AI Releases·medium signal

OpenAI's GPT-5.4 mini and nano model variants became available on OpenRouter on March 18, optimized for speed and cost rather than maximum capability. These are practical deployment targets for multi-step agent workflows where latency and cost-per-call matter more than frontier reasoning. Released on the same day NVIDIA DLSS 5 was posted, described as a 'quiet' day with no new frontier model announcements from major labs.