As of: 2026-11-13 13:49 CET. Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/ Canonical page: https://postcutoff.com/v/brendan-jowett-gpt-6-astra-is-insane-for-building-video-games-full-test/ # GPT-6 Astra Is INSANE For Building Video Games (Full Test) Brendan Jowett, 10 September 2026, YouTube. 888,858 views as of 8 November 2026. Kind: Review. Watch: https://www.youtube.com/watch?v=HVrwoywwvdw ## Description (written by Gemini from the video) **Summary** In this review video, Brendan Jowett tests OpenAI's GPT-6 Astra model to evaluate its ability to autonomously build video games. Using OpenAI's Codex agent application configured to "Ultra" mode alongside Unreal Engine 5 and Blender 5.2 LTS, he prompts the model to recreate progressively complex games ranging from *Super Mario Bros.* to *Subway Surfers*, *Counter-Strike 2*, *Minecraft*, and a *Grand Theft Auto VI*-inspired open-world prototype. --- **What is shown** * **Setup & Workflow [00:46]:** Walkthrough of the software requirements: OpenAI Codex desktop application (running GPT-6 Astra Ultra), Unreal Engine 5, and Blender 5.2 LTS for 3D asset generation. * **Super Mario Bros. Recreation [01:55 - 05:25]:** * Initial prompt asks for a 1:1 recreation of 2D *Super Mario Bros.* inside Unreal Engine [02:07]. The resulting playable clone is demonstrated [02:26]. * Discussion of how Astra initially pulled open-source sprite and audio assets from three GitHub repositories [03:41]. * A follow-up prompt requires the game to be built completely from scratch without external assets [04:15], producing a newly textured and scored version titled "Super Mario From Scratch" [04:20]. * **Subway Surfers Recreation [05:27 - 08:59]:** * Prompt requesting a 3D portrait endless runner recreation without third-party libraries [05:35]. * Demonstration of the functional gameplay featuring track obstacles, coin collection, power-ups, HUD, and an in-game pause/settings menu [06:04]. * Inspection of the generated 3D meshes (character, train, barrier, coin) inside Blender [08:13]. * **Counter-Strike 2 / "Dustfront" [09:28 - 12:30]:** * Prompt for a 1:1 recreation of CS2 desert town map ("Dust II" style) [09:28]. * Demonstration of "Dustfront", showing deploy menu, first-person weapon handling, functional bot combat, bomb planting zone, and pause menu [09:37]. * **Minecraft / "Blockworld" [12:31 - 15:33]:** * Prompt for an open-world voxel recreation in Unreal Engine 5 [12:38]. * Gameplay showing block placing, breaking, flight mode, animal entities (pigs and sheep), and procedural infinite terrain generation across hills and water [12:51]. * **GTA 6 / "Neon Coast" [15:47 - 18:33]:** * Prompt for a coastal open-world Miami recreation inspired by GTA 6 [15:49]. * Showcase of "Neon Coast", featuring third-person walking, entering and driving a sports car with speedometer HUD, urban traffic, sunset lighting, and weapon mechanics [16:02]. --- **Claims & numbers** * The presenter claims GPT-6 Astra is OpenAI's newest and most powerful model, and that he ran it on "Ultra" mode [00:05, 02:03]. * The presenter states each test was prompted with brief instructions (roughly five sentences) without using external open-source libraries (aside from the initial Mario run) [00:32, 06:48, 14:54]. * The Codex UI reports the model's work duration for each build: * Initial Mario clone: worked for 1m 58s across 21 files [01:55]. * Scratch Mario clone: worked for 26m 5s across 21 files [04:14]. * *Subway Surfers* runner: worked for 11m 44s across 27 files [05:27]. * *Dustfront* (CS2 clone): worked for 13m 20s across 30 files [09:28]. * *Blockworld* (Minecraft clone): worked for 18m 55s across 31 files [12:31]. * *Neon Coast* (GTA clone): worked for 16m 20s across 29 files [15:47]. * The presenter claims the Minecraft recreation includes fully working infinite procedural terrain generation created by the AI [14:04]. --- **Notable quotes** * **[00:03]** "Today I'm putting OpenAI's newest and most powerful model, GPT-6 Astra, to the test, building games like Grand Theft Auto, Minecraft, Mario, and more." * **[02:36]** "And I do have to confess that I think GPT Astra actually cheated in building this, and I'll get to why in just a second..." * **[06:47]** "...literally from five sentences be able to build this entire game." --- **Assessment** This is an independent creator review and hands-on capability demonstration showing the Codex desktop interface, Unreal Engine 5 playtests, and Blender asset inspects. While the prototypes exhibit expected visual glitches and rough animations typical of raw zero-shot generative builds, the video convincingly demonstrates playable, interactive game prototypes generated via GPT-6 Astra. _Described by gemini-3.8-flash on 2026-09-29 from the video's audio and frames._ ## How AI was used to make it AI made most of it of this video (Subject built by AI). - GPT-6 Astra generated code and 3D meshes in Blender and Unreal Engine 5 for multiple playable game prototypes Tools: GPT-6 Astra, OpenAI Codex (Classified by gemini-3.8-flash from our description; high confidence. Overview: https://postcutoff.com/ai-video/) ## Related - 2026-09-03: [OpenAI releases GPT-6 Astra, its first GPT-6 model](https://postcutoff.com/e/2026-09-03-gpt-6-astra/) ## More videos on this - 2026-09-03: [GPT-6 Astra builds an Unreal Engine world of Astra-powered people who start talking to each other](https://postcutoff.com/v/mattshumer-gpt-6-astra-unreal-agents-world-x/), Matt Shumer (@mattshumer_), X, made by AI, 11,808,885 views as of 8 November 2026. - 2026-09-29: ["Build what you think you look like": Claude Sonnet 5.5 vs GPT-6 Astra](https://postcutoff.com/v/siyabuilt-sonnet-5-5-vs-gpt-6-astra-what-you-look-like-x/), Siya (@siyabuilt), X, made by AI, 7,259,229 views as of 27 October 2026. - 2026-09-04: [Did OpenAI actually build AGI? GPT-6 Astra first look](https://postcutoff.com/v/fireship-did-openai-actually-build-agi-gpt-6-astra-first-look/), Fireship, YouTube, review, 4,260,544 views as of 8 November 2026. - 2026-09-03: [Introducing GPT-6 Astra: the most intelligent and aligned model in the world.](https://postcutoff.com/v/gpt-6-astra-introducing/), OpenAI, YouTube, official, 3,769,024 views as of 8 November 2026. What else happened that month, day by day: https://postcutoff.com/timeline/2026/09/