GitHub quietly released Raptor mini, a fine-tuned GPT-5-mini model for Copilot with a 264k context window and 64k output capacity. Analysis of debug logs reveals it's optimized for multi-file workspace tasks, tool calling, and code editing within VS Code. The model appears to be a testbed for next-generation Copilot capabilities, offering developers better handling of large codebases and complex refactoring tasks compared to existing models.