---
id: "openai/gpt-5-nano"
also: ["openai/gpt-5-nano-2025-08-07", "requesty/openai/gpt-5-nano", "vercel/openai/gpt-5-nano"]
card_usd_per_m: "0.05 in, 0.4 out, at openai"
cheapest_list_usd_per_m: "0.025 in, 0.2 out, at openai/flex on openrouter"
cheapest_effective_usd_per_m: "0.0169 in, 0.1998 out, at openai/flex on openrouter"
context: 400000
max_output: 128000
input: ["text", "image", "file"]
output: ["text"]
released: "2025-08-07"
reasoning: ["high", "medium", "low", "minimal"]
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["include_reasoning", "max_completion_tokens", "max_tokens", "reasoning", "reasoning_effort", "response_format", "seed", "stop", "structured_outputs", "tool_choice", "tools", "verbosity"]
endpoints: 14
gateways: "requesty (8), openrouter (4), vercel (2)"
no_training: 14
trains: 0
retains_prompts: 4
---
# 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...