OpenAI gpt-5-nano
Version: 2025-08-07
gpt-5-nano is a new class of reasoning model focuses on speed and efficiency with reasoning power for rich question and responses.
gpt-5-mini : A lightweight version for cost-sensitive applications.
gpt-5-nano : Optimized for speed, ideal for applications requiring low latency.
gpt-5-chat : Advanced, natural, multimodal, and context-aware conversations for enterprise applications.
Key Capabilities
- Supports ultra-fast, low-latency use cases
- Now supporting minimal reasoning, a new verbosity setting, and the "customs" tool for raw text output.
- New "allowed tools" tool choice that enables you to specify multiple tools in the tool choice instead of just one
- New "preamble" support, allowing the model to "think" before calling a tool. This is always enabled and controlled through prompting.
- gpt-5-nano supports multimodal inputs, real-time streaming and full tool support for smarter, more dynamic user experiences
Model Variants
gpt-5 : Designed for logic-heavy and multi-step tasks.gpt-5-mini : A lightweight version for cost-sensitive applications.
gpt-5-nano : Optimized for speed, ideal for applications requiring low latency.
gpt-5-chat : Advanced, natural, multimodal, and context-aware conversations for enterprise applications.
Model provider
This model is provided through the Azure OpenAI Service.Relevant documents
The following documents are applicable:- Overview of Responsible AI practices for Azure OpenAI models
- Transparency Note for Azure OpenAI Service
Safety
OpenAI has incorporated additional safety measures including new techniques to help the models refuse unsafe requests. These advancements make the gpt-5 series some of the most robust models available. OpenAI measures safety by testing how well models continue to follow its safety rules if a user tries to bypass them (known as "jailbreaking"). In OpenAI’s internal tests, GPT-4o scored 22 (on a scale of 0-100) while o1-preview model scored 84. You can read more about this in the OpenAI’s system card and research post .Model Specifications
Context Length200000
Quality Index0.83
LicenseCustom
Training DataMay 2024
Last UpdatedAugust 2025
Input TypeText,Image
Output TypeText
PublisherOpenAI
Languages1 Language
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