GPT-5.4 mini and nano are smaller, faster versions of GPT-5.4 optimized for coding, tool use, multimodal reasoning, and high-volume API and sub-agent workloads.

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OpenAI has released GPT-5.4 mini and nano, two smaller and faster variants of GPT-5.4 optimized for high-volume, latency-sensitive workloads. GPT-5.4 mini runs more than 2x faster than GPT-5 mini while approaching GPT-5.4 performance on benchmarks like SWE-Bench Pro and OSWorld-Verified. GPT-5.4 nano is the cheapest option, suited for classification, data extraction, and simpler coding subagents. Both models support tool use, function calling, multimodal inputs, and a 400k context window. GPT-5.4 mini is priced at $0.75/1M input tokens and $4.50/1M output tokens; nano at $0.20/$1.25. They are available via the API, and mini is also accessible in Codex and ChatGPT. The release emphasizes composing multi-model systems where larger models plan and smaller models execute subtasks in parallel.

Introducing GPT‑5.4 mini and nano