Question 1

What is GPT-5.4 Nano?

Accepted Answer

GPT-5.4 Nano is a model from OpenAI, released on Mar 17, 2026. GPT-5.4 nano is the most lightweight and cost-efficient variant of the GPT-5.4 family, optimized for speed-critical and high-volume tasks. It supports text and image inputs and is designed for low-latency use cases such as classification, data extraction, ranking, and sub-agent execution. The model prioritizes responsiveness and efficiency over deep reasoning, making it ideal for pipelines that require fast, reliable outputs at scale. GPT-5.4 nano is well suited for background tasks, real-time systems, and distributed agent architectures where minimizing cost and latency is essential.

Question 2

How much does GPT-5.4 Nano cost?

Accepted Answer

On the Respan gateway, input starts at $0.20 per 1M tokens on OpenRouter, and output starts at $1.25 per 1M tokens on every provider, after gateway discounts. Averaged across 5 providers, it costs $0.20 per 1M input tokens and $1.25 per 1M output tokens.

Question 3

Which providers serve GPT-5.4 Nano on Respan?

Accepted Answer

5 providers serve GPT-5.4 Nano: OpenRouter, Azure OpenAI, OpenAI, and Perplexity. Azure OpenAI and Perplexity require your own provider API key (BYOK).

Question 4

What is GPT-5.4 Nano's context window?

Accepted Answer

GPT-5.4 Nano accepts up to 400K tokens of context on its largest provider route.

Question 5

How do I use GPT-5.4 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-5.4-nano". 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-5.4 Nano?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenAI at 79 tokens per second, and the lowest response latency was 0.5 seconds on OpenAI. Speed varies with request size and provider.

Question 7

Where does GPT-5.4 Nano rank on the Respan Index?

Accepted Answer

GPT-5.4 Nano scores 20.5 out of 100 on the Respan Index v1.1, ranking #93 of 138 models. By category: Coding 9.5, Agents 17.8, Reasoning 22.7, Knowledge & language 13.0, and Human preference 44.6. 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-5.4 Nano score on benchmarks?

Accepted Answer

GPT-5.4 Nano has 26 published benchmark scores, including LiveBench Coding 70.8%, LiveBench Agentic Coding 46.8%, and GPQA Diamond 82.8%. Each score links to where it was published; the data is collected by llmmetric.com.

Provider	Context	Input	Output
OpenRouter`openrouter/openai/gpt-5.4-nano`	400K	$0.20/M	$1.25/M
Azure OpenAIBYOK only`azure/gpt-5.4-nano`	400K	$0.20/M	$1.25/M
OpenAI`openai/gpt-5.4-nano`	400K	$0.20/M	$1.25/M
OpenAI`openai/gpt-5.4-nano-2026-03-17`	400K	$0.20/M	$1.25/M
PerplexityBYOK only`perplexity/openai/gpt-5.4-nano`	400K	$0.20/M	$1.25/M

GPT-5.4 Nano

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Benchmarks

Respan Indexv1.1

Coding4

Apps

GPT-5.4 Nano FAQ

Works with your entire stack

Built for AI agents.
Break less.
Ship more.

Agents3

Reasoning6

Math6

Knowledge4

Arena2

Other1