Question 1

What is GPT-5.4 Mini?

Accepted Answer

GPT-5.4 Mini is a model from OpenAI, released on Mar 17, 2026. GPT-5.4 mini brings the core capabilities of GPT-5.4 to a faster, more efficient model optimized for high-throughput workloads. It supports text and image inputs with strong performance across reasoning, coding, and tool use, while reducing latency and cost for large-scale deployments. The model is designed for production environments that require a balance of capability and efficiency, making it well suited for chat applications, coding assistants, and agent workflows that operate at scale. GPT-5.4 mini delivers reliable instruction following, solid multi-step reasoning, and consistent performance across diverse tasks with improved cost efficiency.

Question 2

How much does GPT-5.4 Mini cost?

Accepted Answer

On the Respan gateway, input starts at $0.75 per 1M tokens on every provider, and output starts at $4.50 per 1M tokens on every provider, after gateway discounts.

Question 3

Which providers serve GPT-5.4 Mini on Respan?

Accepted Answer

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

Question 4

What is GPT-5.4 Mini's context window?

Accepted Answer

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

Question 5

How do I use GPT-5.4 Mini 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-mini". 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 Mini?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenAI at 66 tokens per second, and the lowest response latency was 0.6 seconds on OpenRouter. Speed varies with request size and provider.

Question 7

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

Accepted Answer

GPT-5.4 Mini scores 31.2 out of 100 on the Respan Index v1.1, ranking #63 of 138 models. By category: Coding 14.2, Agents 45.1, Reasoning 24.1, Knowledge & language 28.7, and Human preference 50.1. 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 Mini score on benchmarks?

Accepted Answer

GPT-5.4 Mini has 28 published benchmark scores, including LiveBench Coding 71.6%, OSWorld-Verified 72.1%, and GPQA Diamond 88%. Each score links to where it was published; the data is collected by llmmetric.com.

Provider	Context	Input	Output
Azure OpenAIBYOK only`azure/gpt-5.4-mini`	400K	$0.75/M	$4.50/M
OpenAI`openai/gpt-5.4-mini`	400K	$0.75/M	$4.50/M
OpenAI`openai/gpt-5.4-mini-2026-03-17`	400K	$0.75/M	$4.50/M
OpenRouter`openrouter/openai/gpt-5.4-mini`	400K	$0.75/M	$4.50/M
PerplexityBYOK only`perplexity/openai/gpt-5.4-mini`	400K	$0.75/M	$4.50/M

GPT-5.4 Mini

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Benchmarks

Respan Indexv1.1

Coding5

Apps

GPT-5.4 Mini FAQ

Works with your entire stack

Built for AI agents.
Break less.
Ship more.

Agents3

Reasoning6

Math6

Knowledge4

Arena3

Other1