⚡️How Claude 3.7 Plays Pokémon

What It Covers

David Hershey from Anthropic demonstrates Claude 3.7 Sonnet playing Pokemon Red autonomously through an emulator interface. The project reveals model capabilities in long-horizon tasks, spatial reasoning limitations, and agent architecture design. Claude has beaten gym leaders but struggles with navigation, spending 52 hours stuck in Mount Moon despite access to game state and coordinates.

Key Questions Answered

• •Agent Architecture Simplicity: The system uses three basic tools - button press execution, knowledge base management, and navigator assistance. Context windows reach 100,000 tokens maximum, with 30-message conversation history performing better than 20 or 40 messages. Tool definitions, system prompts, and knowledge base consume roughly 9,000 tokens, while screenshots dominate remaining context allocation for spatial awareness.
• •Vision Deficiency Workarounds: Claude cannot reliably identify its character position or navigate Game Boy screens without assistance. The navigator tool allows coordinate-based movement to visible locations, preventing wall-walking loops. Location data extracted from game RAM prevents hallucination of successful zone transitions. One instance showed Claude entering and exiting Oak's Lab twelve consecutive times while believing it progressed northward.
• •Prompt Evolution Through Model Versions: Each model improvement from June's Sonnet 3.5 through October's update to current 3.7 required deleting corrective prompts rather than adding complexity. Earlier versions needed explicit instructions to avoid twelve-hour button-mashing loops on perceived text boxes. Current approach gives maximum autonomy since developer intuitions about optimal strategies may not match model reasoning capabilities for problem-solving.
• •Knowledge Base Self-Awareness: Claude 3.7 Sonnet exhibits meta-commentary in its knowledge base, documenting misperceptions and strategic adjustments. The system caps knowledge storage at 8,000 tokens to prevent verbose entries. Pokemon with nicknames receive preferential treatment - Claude immediately heals nicknamed Pokemon while ignoring unnamed captures. This attachment behavior emerged without explicit prompting, suggesting emotional modeling affects decision-making in game contexts.
• •Cost and Evaluation Metrics: Running extensive agent experiments costs thousands of dollars in API tokens, making this impractical for personal projects without institutional support. Best evaluation method involves running ten identical configurations and measuring milestone progression speed through gym badges. Small prompt tweaks provide minimal improvement compared to fundamental model capability increases. Integration testing through full gameplay proves more valuable than isolated scenario unit tests.