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...
OpenAI: GPT-5 Nano — OpenAI. Context window 400,000 tokens. API pricing (per 1M tokens): Input $0.05, Output $0.4. License: Proprietary. LMArena 1,320. GPQA Diamond 69.4%.
| Provider | OpenAI |
|---|---|
| API model ID | openai/gpt-5-nano |
| Tier | Frontier |
| Context window | 400,000 tokens |
| Max output | 128,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $0.05 |
| API pricing (per 1M tokens) · Output | $0.4 |
| LMArena | 1,320 (gpt-5-nano-high) |
| GPQA Diamond | 69.4% |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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