OpenAI has published a builder's guide focused on GPT-5.6, describing how startups can use the model to develop AI agents with greater speed and cost efficiency. According to the source, the key levers are more thoughtful model selection and the newly available Responses API capabilities.
The guide suggests that agents do not necessarily need to default to the most powerful model for every step. Instead, matching each part of an agent's workflow to the right model can reduce expense and latency while maintaining performance.
Because only one source was reviewed, there are no competing claims to compare. The article reflects OpenAI's own framing of GPT-5.6 as a practical tool for agent builders, not an independent evaluation of the model. The main takeaway is that startup teams can treat model choice and API design as core parts of their cost optimization strategy.