Claude Opus 5.5 turns graphite into gravity

Summary This video is an official demonstration by Anthropic showcasing an interactive "Sketch to Physics" concept built with Claude. It demonstrates taking a 2D pencil sketch of a trebuchet and block tower, parsing its dimensions, converting it into an interactive 3D physics simulation, and letting the user experiment with launch physics in real time.

What is shown

• 00:00 – 00:16: A pencil sketch of a trebuchet on a desk is scanned ("Read" phase), identifying structural components (wheels, frame, arm, pivot, counterweight, cup, projectile ball, path, and block tower) and extracting dimensions (e.g., 155 mm base, 70 mm and 93 mm arm segments, 243 mm tower height).
• 00:17 – 00:27: The 2D sketch elements lift off the page and reconstruct into an articulated 3D wooden and paper model ("Lift" phase).
• 00:28 – 00:37: The model simulates an initial throw with a 0.48 kg counterweight that falls short, computes alternative trajectory paths for different masses (0.48 kg, 0.68 kg, 0.95 kg), and adjusts to 0.68 kg.
• 00:38 – 00:44: The trebuchet fires the ball into the tower, toppling the blocks, followed by a slow-motion (0.25×) telemetry replay showing launch velocity (1.65 m/s at 32°) and impact velocity (2.35 m/s).
• 00:45 – 01:21: The user enters an interactive "Build it yourself" sandbox, adjusting counterweights, pulling the arm back to various angles (e.g., 18°, 83°), toggling flight paths, and firing projectiles to test physics collisions.
• 01:22 – 01:24: Closing screen displaying the Claude logo.

Claims & numbers

• Trebuchet and tower sketch dimensions: Base length 155 mm, axle height 46 mm, arm lengths 70 mm and 93 mm, block width 40 mm, block height 61 mm, total tower height 243 mm (shown on-screen at 00:15–00:16).
• Counterweight simulations: 0.48 kg (labeled "short"), 0.68 kg (optimal hit), and 0.95 kg (overshoot) (shown on-screen at 00:35).
• Telemetry data: Launch speed of 1.65 m/s at an angle of 32°, resulting in an impact velocity of 2.35 m/s (shown on-screen at 00:42).

Notable quotes

• None (the video contains only instrumental background music and visual UI elements; there is no spoken narration).

Assessment This is an official Anthropic concept demo highlighting multimodal understanding and interactive code/simulation generation. While the rendering presents an aesthetic, highly polished 3D environment, it showcases genuine physics modeling, trajectory calculation, and interactive browser-based UI controls generated from hand-drawn input.

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