In September 2026, AI enthusiast CozyBlaze used OpenAI’s new model GPT-6 Astra to complete the entire gameplay of Valve’s 3D puzzle game “Portal” independently. In the experiment, GPT-6 Astra controlled the game process through the Model Context Protocol (MCP) and a modified SourcePauseTool. During game pauses, it analyzed screenshots and character location information, then executed movements and other actions as planned. A total of 3,336 tool calls were made in this experiment, taking approximately 24 hours. The total API cost was $571.18, covered by CozyBlaze’s Codex Pro subscription. Although this achievement should not be considered a standardized benchmark for AI capabilities, it marks substantial progress in the autonomous exploration and task completion abilities of general agents in complex 3D environments.
GPT-6 Astra successfully completed the game “Portal” on September 7, 2026, autonomously.
Coverage · reports per dayLANGUAGE SPLIT
Entity relations
Integrated timelineUNIFIED TIMELINE
2026-09-07
GPT-6 Astra completed “Portal” autonomously
AI enthusiast CozyBlaze used OpenAI’s new model GPT-6 Astra to complete the game entirely autonomously, taking approximately 24 hours and costing $571.18. In the experiment, the model called tools 3336 times using MCP and SourcePauseTool.
In September 2026, AI enthusiast CozyBlaze used OpenAI’s new flagship model GPT-6 Astra to complete the entire gameplay of Valve’s “Portal” independently. In the experiment, the model used the Model Context Protocol and the customized SourcePauseTool to invoke tools 3,336 times, taking approximately 24 hours (2 hours for editing videos). The total API cost of $571.18 was covered by Codex Pro subscription. AI analyzed screenshots and location information when the game was paused and executed commands after resuming. Although this is not a standardized benchmark test, it marks substantial progress in the exploration capabilities of general agents in complex 3D environments.
OpenAI’s new model GPT-6 Astra independently completed the 3D puzzle game “Portal” developed by Valve, taking 24 hours and costing $571.18. The experiment was initiated by enthusiast CozyBlaze. GPT-6 Astra controlled the game process using the Model Context Protocol (MCP) and the modified SourcePauseTool. During the model’s thinking period, the game paused, and screenshot and character position information were received. Then, movements were executed according to a planned sequence. A total of 3,336 tool calls were made during this completion, with a full live recording lasting 24 hours and a edited video taking about 2 hours. CozyBlaze clarified that the costs were covered by his monthly $200 Codex Pro subscription, and emphasized that this achievement should not be regarded as a standardized benchmark test of AI capabilities. However, they believed that the ability of a general agent to independently explore and complete games verified OpenAI’s goal in 2016 to create a single AI agent to solve…