gpt-5-nano · OpenAI
GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, designed specifically for developer tools and environments that demand rapid interactions and ultra-low latency. While it offers a more lightweight solution with limited reasoning depth compared to its larger counterparts, GPT-5-Nano excels in core capabilities such as instruction-following and maintaining critical safety features. As the successor to GPT-4.1-nano, it provides an optimal choice for cost-sensitive or real-time applications, where efficiency and speed are paramount. Particularly well-suited for summarization and classification tasks, GPT-5-Nano is a powerful tool for developers needing a swift, reliable AI model for streamlined processes.
GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, designed specifically for developer tools and environments that demand rapid interactions and ultra-low latency. While it offers a more lightweight solution with limited reasoning depth compared to its larger counterparts, GPT-5-Nano excels in core capabilities such as instruction-following and maintaining critical safety features. As the successor to GPT-4.1-nano, it provides an optimal choice for cost-sensitive or real-time applications, where efficiency and speed are paramount. Particularly well-suited for summarization and classification tasks, GPT-5-Nano is a powerful tool for developers needing a swift, reliable AI model for streamlined processes.
GPT 5 Nano has a 400,000 token context window.
On AIHubMix, GPT 5 Nano costs $0.05 per million input tokens and $0.4 per million output tokens. Cached input reads are billed at $0.005 per million tokens.
GPT 5 Nano accepts text and image input.
GPT 5 Nano supports thinking, tool calling, function calling and structured outputs. Per-protocol parameter support is listed in the capability table on this page.
GPT 5 Nano is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to gpt-5-nano — no other code changes needed.
GPT 5 Nano is developed by OpenAI. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
GPT 5 Nano was released on August 7, 2025 by OpenAI.
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Use GPT 5 Nano via the AIHubMix unified API — one interface for every major LLM.