What is GPT-5 Nano's context window?

GPT-5 Nano supports a context window of 128,000 tokens, allowing you to process large documents and maintain long conversations.

How to use GPT-5 Nano API via Ofox?

Simply set your base URL to https://api.ofox.run/v1 and use your Ofox API key. The API is OpenAI-compatible — just change the base URL and API key in your existing code.

What capabilities does GPT-5 Nano support?

GPT-5 Nano supports the following capabilities: function calling, prompt caching. Access all features through the Ofox.ai unified API.

GPT-5 Nano

Name: GPT-5 Nano
Brand: openai
Price: 0.049999999999999996 USD
Availability: InStock

Chat-20%

openai/gpt-5-nano

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GPT-5 Nano is the ultra-efficient member of the GPT-5 family, released on 2025-08-07 and optimized for maximum throughput at minimal cost. Its low-latency design targets high-volume automation, with support for tool use (function calling) and prompt caching, so repeated instructions stay inexpensive across large batches. Context: 128K tokens, output: 16K. Accessible via the OpenAI-compatible protocol.

Context Window

128K

Max Output Tokens

16K

Released

2025-08-07

Capabilities

Function CallingPrompt Caching

Available Providers

Azure

Supported Protocols

openai

Providers

Azureprovider.type: "azure_foundry"

-20%

Input Tokens

$0.04/M

$0.05/M

Output Tokens

$0.32/M

$0.4/M

Cache Read

$0.008/M

$0.01/M

Output Image

$25.6/M

$32/M

Web Search

$0.035/R

Protocols

openai/v1/chat/completions/v1/responses

Playground

Open in OfoxChat

Code Examples

from openai import OpenAI

client = OpenAI(
    base_url="https://api.ofox.run/v1",
    api_key="YOUR_OFOX_API_KEY",
)

response = client.chat.completions.create(
    model="openai/gpt-5-nano",
    messages=[
        {"role": "user", "content": "Hello!"}
    ],
)

print(response.choices[0].message.content)

Benchmarks

LMArena ↗Evaluated as gpt-5-nano-high

GPT-5 Nano scores 1337 in the Overall category of the LMArena text leaderboard (style control), ranking #196 of 374 models based on 8,260 human preference votes (updated 2026-07-12).

Benchmark scores for gpt-5-nano-high on LMArena
Category	Arena Score	95% CI	Rank	Votes
Overall	1337	1330–1344	#196 of 374	8,260
Hard Prompts	1354	1344–1364	#192 of 374	3,814
Coding	1383	1368–1397	#195 of 369	1,684
Math	1345	1318–1371	#181 of 362	491
Creative Writing	1248	1228–1268	#257 of 372	913
Instruction Following	1326	1313–1339	#190 of 374	2,028
Chinese	1377	1347–1407	#170 of 344	380

Source: LMArena · CC BY 4.0 · Updated 2026-07-12 · Methodology ↗ · Ranks compare models within each category of the LMArena text leaderboard (style control). Scores come from third-party human preference evaluations, not from OFOX.