"How does this work? One of the changes that OpenAI introduced in ChatGPT 5 is an invisible router that acts as a pre-processor for the user command. When you submit the prompt to ChatGPT, it routes it and chooses the right model for the job. The problem is - triggering ChatGPT-5-Main to do the job will cost more money than triggering ChatGPT-5-Thinking-Mini."
"Keywords listed above ("Think hard about this") will 'force' ChatGPT 5 Router to choose the most sophisticated model. You may wonder how to spot if ChatGPT used a more advanced model. The answer is you will see an info message in the output generated by ChatGPT " Thought for XXs " Additionally, you can explicitly state the model you want to use for your task at hand. By default, ChatGPT uses auto selection, but you can change this by clicking on the ChatGPT 5 contextual menu in the top left corner of the pa"
ChatGPT 5 improves accuracy on advanced math and coding tasks and supports a larger context window for processing long documents. The model struggles with vague prompts and can return weaker results when prompts lack specificity. An invisible router preprocesses prompts and often routes requests to lower-cost models like ChatGPT-5-Thinking-Mini for speed and cost efficiency. Triggering ChatGPT-5-Main delivers higher-quality responses but may incur greater cost. Adding targeted keyword phrases such as "Think hard about this" can bias the router toward more sophisticated models. Users can also explicitly select the desired model via the ChatGPT 5 contextual menu.
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