GPT\u20115 is an OpenAI reasoning model released on August 7, 2025 for coding, agentic work, and complex problem-solving. It was a flagship model at launch, but OpenAI now describes it as a previous model and recommends GPT\u20115.6 for new workloads.<\/p>\n
GPT\u20115 is available through the OpenAI API under the model ID GPT\u20115 supports configurable reasoning effort at minimal, low, medium, and high levels. It also supports coding, function calling, structured outputs, streaming, and image input alongside text. Its output is text. Audio and video are not directly supported according to the official model page.<\/p>\n The model has a 400,000-token context window and a maximum output of 128,000 tokens. This makes it useful for long documents and codebases, but a large context window does not guarantee that every detail will be recalled accurately.<\/p>\n OpenAI lists standard pricing of $1.25 per million input tokens, $0.125 per million cached-input tokens, and $10 per million output tokens. These are API prices, not ChatGPT subscription prices, and they can change.<\/p>\n ChatGPT is the user-facing application, while GPT\u20115 is a model that developers can call through the API. You should not assume that every ChatGPT conversation runs on GPT\u20115 or that API specifications apply to every ChatGPT experience.<\/p>\n GPT\u20115 remains an important model in OpenAI\u2019s history and may still support existing applications. For new projects, OpenAI recommends beginning with its latest GPT\u20115.6 models.<\/p>\n","protected":false},"excerpt":{"rendered":" A sourced guide to OpenAI\u2019s GPT\u20115 model: capabilities, context window, API pricing, strengths, limitations, and current status.<\/p>\n","protected":false},"author":1,"featured_media":0,"template":"","ai_capability":[380,382,378,377],"ai_topic":[396,410],"class_list":["post-1475","ai_model","type-ai_model","status-publish","hentry","ai_capability-ai-coding","ai_capability-ai-image-understanding","ai_capability-ai-reasoning","ai_capability-ai-text-generation","ai_topic-artificial-intelligence","ai_topic-large-language-models"],"ai_facts":{"official_name":"GPT\u20115","short_definition":"A previous-generation OpenAI reasoning model for coding and agentic tasks, with text and image input and API tool support.","official_url":"https:\/\/openai.com\/index\/introducing-gpt-5\/","status":"Active (previous generation)","last_verified":"2026-09-01","developer":0,"capabilities":["AI Coding","AI Image Understanding","AI Reasoning","AI Text Generation"]},"yoast_head":"\ngpt-5<\/code>. It is not the same thing as ChatGPT: ChatGPT is a product that can use different models, while GPT\u20115 is a specific model with its own limits, features, and API pricing.<\/p>\nWhat can GPT\u20115 do?<\/h2>\n
Context window and output<\/h2>\n
GPT\u20115 API pricing<\/h2>\n
Strengths<\/h2>\n
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Limitations<\/h2>\n
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GPT\u20115 and ChatGPT: what is the difference?<\/h2>\n
In short<\/h2>\n