OpenAI Ships GPT-5.4 Mini to Power Autonomous Agent Infrastructure
OpenAI just shipped the infrastructure layer for the agent economy. The Signal GPT-5.4 mini and nano aren't about making chatbots cheaper. They're about making autonomous agents practical at scale. The key tells are in the optimization targets: coding, tool use, and "sub-agent workloads." That last phrase is doing heavy lifting. OpenAI is saying the quiet part out loud. They're building
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