Meet GPT-5.6

TL;DR: OpenAI releases GPT-5.6 series models, each token provides more intelligence, stronger direction consistency, and through programmatic tool calling, sub-agent delegation, and new reasoning levels, greatly improves autonomous development efficiency. ## GPT-5.6 Series Models Officially Released Today, we officially launch the GPT-5.6 series models. Throughout the series, GPT-5.6 delivers more intelligence per token and maintains better direction alignment, even handling ambiguous prompts with ease. ## Live Demo: Building a Card Game with GPT-5.6 I used GPT-5.6 in Codex to build a brand new card game. Starting from a brief, intentionally blank prompt, I ended up making a game that I actually want to play myself. The model designed core game mechanics, generated art assets, and released a playable first version. But I thought of a better version, so I asked it to continue improving: add levels, strengthen game mechanics, customize art style, and compose a soundtrack. I love the model's attention to detail. No need to worry about designing every interface, defining every interaction, or managing a huge to-do list. ## Core New Feature: Programmatic Tool Calling I think the coolest part of GPT-5.6 is programmatic tool calling. While building the game, the model was able to call tools from the sandbox, avoiding a lot of back-and-forth between tool outputs and the context window. This saved me a lot of time and tokens. ## More Sustained Thinking: New Reasoning Level Above Extra High Another feature that makes the model so persistent is the addition of a reasoning level above Extra High, giving GPT-5.6 stronger thinking ability. ## Better Sub-Agent Delegation Capabilities If you use the model in Codex, GPT-5.6 is also better at delegating work to sub-agents. Previous models could do this too, but GPT-5.6 is trained to judge when delegation is most useful. In our game, the model used sub-agents to break down work and complete it in parallel, such as art and sound design. ## Different Model Options in the API If you use GPT-5.6 in the API, we have a flagship model for advanced autonomous tasks, a more balanced model, and a fast, affordable model for everyday tasks. ## Looking Forward to Your Creations This game is just one of many projects I've built with GPT-5.6, and I can't wait to see what you create. Happy building. Source: https://youtu.be/-MPGU2a67Ls