Introducing GPT-6 Astra for developers

Summary
Charlie Guo, Developer Experience Engineer at OpenAI, presents GPT-6 Astra, highlighting its capabilities for developers and knowledge workers. The video demonstrates the model’s updated computer-use agent capabilities, high-complexity creative coding and 3D scene generation, and new developer API features including asynchronous tool calling and steering.

What is shown

• [00:05] Charlie Guo introduces GPT-6 Astra as OpenAI’s newest frontier model.
• [00:35] Overview of Computer Use capabilities in ChatGPT, Codex, and via API.
• [00:59] Computer use demo: Charlie uploads a photo of his desk and prompts Astra to use the desktop art software Krita to paint the scene in the style of Van Gogh with the Golden Gate Bridge in the background.
• [01:06 - 01:22] Accelerated playback (marked 28x speed) showing the model navigating Krita’s canvas, layers, and brushes to produce an illustration.
• [01:37] Model comparison dashboard (“Model Observatory”) displaying output quality differences between GPT-5.5, GPT-5.6 Sol, and GPT-6 Astra across web apps (Waveform Studio, Watchmaker Landing Page, Codex Pet Arena, Golden Gate Experience).
• [01:54 - 02:02] Showcase of 3D models and render scenes built by Astra (water lilies in a pond, space fleet shipyard, pelican on a bicycle, cityscapes, and a Dyson sphere).
• [02:27] Explanation and code snippets for two new Responses API features: asynchronous tool calling (async: true) and live steering (response.steer).
• [02:45 - 03:02] Interactive demonstration of steering in a 3D Three.js Japanese garden generator: the user sends “Actually, let’s make the trees red” mid-generation, and Astra incorporates the change without restarting the task.

Claims & numbers

• Charlie Guo claims GPT-6 Astra is “the best model in the world for tasks where raw intelligence matters.”
• The presenter claims Astra is “more accurate and more efficient when using a computer” than prior models.
• The Krita painting generation is shown running at 28x playback speed.
• The presenter states that Astra is available in ChatGPT, Codex, and the OpenAI API.

Notable quotes

• [00:05] “GPT-6 Astra is here. It’s our latest frontier model, and the best model in the world for tasks where raw intelligence matters.”
• [00:13] “From my own projects, Astra feels like working with an experienced collaborator. I’m able to hand it bigger, less well-defined tasks with minimal hand-holding.”
• [02:25] “That’s why we’re bringing asynchronous tool calling and steering to the Responses API.”

Assessment
This is an official OpenAI developer announcement video showcasing feature additions such as computer use, 3D web rendering, and new API primitives. Demonstrations include real interface workflows, though longer agent tasks (such as the Krita drawing session) are edited with time compression (labeled 28x speed) and the 3D renders are presented as pre-rendered showcase clips.

Described by gemini-3.8-flash on 2026-09-29 from the video’s audio and frames.