Question 1

What is GPT-5 Nano?

Accepted Answer

GPT-5 Nano is a model from OpenAI, released on Aug 7, 2025. 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.

Question 2

How much does GPT-5 Nano cost?

Accepted Answer

On the Respan gateway, input starts at $0.05 per 1M tokens on OpenRouter, and output starts at $0.40 per 1M tokens on OpenRouter, after gateway discounts.

Question 3

Which providers serve GPT-5 Nano on Respan?

Accepted Answer

6 providers serve GPT-5 Nano: OpenRouter, Azure OpenAI, Inference.net, OpenAI, and Perplexity. Azure OpenAI and Perplexity require your own provider API key (BYOK).

Question 4

What is GPT-5 Nano's context window?

Accepted Answer

GPT-5 Nano accepts up to 400K tokens of context on its largest provider route.

Question 5

How do I use GPT-5 Nano with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "openai/gpt-5-nano-2025-08-07". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is GPT-5 Nano?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenAI at 121 tokens per second, and the lowest response latency was 1.4 seconds on Azure OpenAI. Speed varies with request size and provider.

Question 7

Where does GPT-5 Nano rank on the Respan Index?

Accepted Answer

GPT-5 Nano scores 17.3 out of 100 on the Respan Index v1.1, ranking #109 of 138 models. By category: Coding 4.8, Agents 20.8 (estimated), Reasoning 16.8, Knowledge & language 11.7, and Human preference 36.8. The Respan Index combines independent and lab-reported benchmark results into one score, using benchmark data collected by llmmetric.com.

Question 8

How does GPT-5 Nano score on benchmarks?

Accepted Answer

GPT-5 Nano has 17 published benchmark scores, including SWE-bench Verified 54.7%, GPQA Diamond 69.4%, and MATH Level 5 95.2%. Each score links to where it was published; the data is collected by llmmetric.com.

Provider	Context	Input	Output
OpenRouter`openrouter/openai/gpt-5-nano`	400K	$0.05/M	$0.40/M
Azure OpenAIBYOK only`azure/gpt-5-nano`	400K	$0.05/M	$0.40/M
Inference.net`inference_net/gpt-5-nano`	400K	$0.05/M	$0.40/M
OpenAI`openai/gpt-5-nano`	400K	$0.05/M	$0.40/M
OpenAI`openai/gpt-5-nano-2025-08-07`	400K	$0.05/M	$0.40/M
PerplexityBYOK only`perplexity/openai/gpt-5-nano`	400K	$0.05/M	$0.40/M

GPT-5 Nano

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Benchmarks

Respan Indexv1.1

Coding2

Reasoning

Apps

GPT-5 Nano FAQ

Works with your entire stack

Built for AI agents.
Break less.
Ship more.

Math7

Knowledge2

Arena2

Other1