OpenAI: GPT-5.4 Mini

openai/gpt-5.4-mini

Released Mar 17, 2026400,000 context

$0.75/M input tokens$4.50/M output tokens$10/K web search

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.

Providers for GPT-5.4 Mini

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for GPT-5.4 Mini

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Effective Pricing for GPT-5.4 Mini

Actual cost per million tokens across providers over the past hour

Apps using GPT-5.4 Mini

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Recent activity on GPT-5.4 Mini

Total usage per day on OpenRouter

Prompt

3.55B

Completion

122M

Reasoning

112M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Uptime stats for GPT-5.4 Mini

Uptime stats for GPT-5.4 Mini across all providers

Sample code and API for GPT-5.4 Mini

OpenRouter normalizes requests and responses across providers for you.

OpenRouter supports reasoning-enabled models that can show their step-by-step thinking process. Use the reasoning parameter in your request to enable reasoning, and access the reasoning_details array in the response to see the model's internal reasoning before the final answer. When continuing a conversation, preserve the complete reasoning_details when passing messages back to the model so it can continue reasoning from where it left off. Learn more about reasoning tokens.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.

GPT-5.4 Mini - API Pricing & Providers | OpenRouter