OpenAI: GPT-5 Nano

openai/gpt-5-nano

Chat

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.

by OpenAI

Input type Output type Publish time 
        |              | 2025-08-07

Recent activity on GPT-5 Nano

Tokens processed per day

Throughput

(tokens/s)

Providers Min (tokens/s) Max (tokens/s) Avg (tokens/s)
Azure 10.45 153.25 55.79
OpenAI 109.34 109.34 109.34

First Token Latency

(ms)

Providers Min (ms) Max (ms) Avg (ms)
Azure 786 13906 4840.81
OpenAI 626 7160 3893.00

Uptime stats for GPT-5 Nano

Uptime stats for GPT-5 Nano across all providers

Uptime

Azure
OpenAI

( Percent )

Providers for GPT-5 Nano

ZenMux Provider to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

OpenAI

Latency

Throughput

Uptime

Recent uptime
Apr 30, 2026 6:00 PM-

Price

Input
$ 0.05/ M tokens
Output
$ 0.4/ M tokens
Cache read
$ 0.005/ M tokens
Cache write 5m

Cache write 1h

Cache write

Web search
$ 0.01/ counts
Image

Image input

Image output

Image cache

reasoning

Video

Audio

Audio cache read

Audio input

Audio & Video

Image search

Web search image

Model limitation

Context
400.00K
Max output
128.00K
Supported Parameters

max_completion_tokens

temperature

top_p

frequency_penalty

presence_penalty

seed

logit_bias

logprobs

top_logprobs

response_format

stop

tools

tool_choice
parallel_tool_calls

Model Protocol Compatibility

OpenAI Chat Completions
OpenAI Responses
OpenAI Embeddings

Anthropic Messages

Google Gemini

Google Imagen

Google Video

Status Page
status page

Sample code and API for GPT-5 Nano

ZenMux normalizes requests and responses across providers for you.

Create API Key

OpenAI: Python-SDK

OpenAI: cURL

from openai import OpenAI

client = OpenAI(
  base_url="https://zenmux.ai/api/v1",
  api_key="<ZENMUX_API_KEY>",
)

# Chat Completion
completion = client.chat.completions.create(
  model="openai/gpt-5-nano",
  messages=[\
    {\\
      "role": "user",\\
      "content": "What is the meaning of life?"\\
    }\\
  ]
)
print(completion.choices[0].message.content)

# Responses API
responses = client.responses.create(
  model="openai/gpt-5-nano",
  input="What is the meaning of life?"
)
print(responses)