OpenAI: GPT-5 Nano

GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger counterparts, it retains key instruction-following and safety features. It is the successor to GPT-4.1-nano and offers a lightweight option for cost-sensitive or real-time applications.

• Context window: 400,000 tokens
• Input: text, image, file
• Output: text
• Pricing: $0.05/M input tokens, $0.4/M output tokens

View on OpenRouter. Model data sourced from OpenRouter.