OpenAI: GPT-5 Nano

OpenAI

OpenAI: GPT-5 Nano by OpenAI costs $0.05 per 1M input tokens and $0.40 per 1M output tokens, with a 400K-token context window.

Pricing

Input (per 1M tokens)

$0.05

Output (per 1M tokens)

$0.40

Cached input (per 1M)

$0.01

Provider	Input / 1M	Output / 1M
openrouter	$0.05	$0.40
OpenAI	$0.05	$0.40

Specifications

Provider: OpenAI
Context window: 400K tokens
Parameters: —
Released: Aug 2025
Open weights: No
Frontier model: No

Benchmarks

Epoch Capabilities Index: 139.4
FrontierMath: 8.3
GPQA Diamond: 69.4
LMArena (Chatbot Arena) Elo: 1320.0
LMArena Vision Elo: 1159.2
SWE-bench Verified: 34.8

Speed & latency

Time to first token

5.71s

Output speed

154 tok/s

Fastest host: openai (via vercel-ai-gateway).

Compare OpenAI: GPT-5 Nano with…

OpenAI: GPT-5 Nano vs OpenAI: GPT-5.6 Sol Pro$10.00/1M OpenAI: GPT-5 Nano vs OpenAI: GPT-6.1 Sol Pro$10.00/1M OpenAI: GPT-5 Nano vs OpenAI: GPT-6.1 Sol Pro (batch)$5.00/1M OpenAI: GPT-5 Nano vs OpenAI: GPT-6.1 Sol$10.00/1M OpenAI: GPT-5 Nano vs OpenAI: GPT-6.1 Sol (batch)$5.00/1M OpenAI: GPT-5 Nano vs OpenAI: GPT-6 Luna Pro$0.50/1M

FAQ

How much does OpenAI: GPT-5 Nano cost?

OpenAI: GPT-5 Nano is priced at $0.05 per 1M input tokens and $0.40 per 1M output tokens. Output tokens cost more than input.

What is OpenAI: GPT-5 Nano's context window?

OpenAI: GPT-5 Nano supports a context window of 400K tokens — the maximum prompt plus response length it can handle in a single request.

Is OpenAI: GPT-5 Nano open weight?

No — OpenAI: GPT-5 Nano is a closed/proprietary model accessed via API.

Data as of 2026-10-14. Source: Pricing via OpenRouter API, openrouter.ai. Pricing is per 1M tokens (USD); confirm with the provider before production use.