Agentic Engineering: WTF Happened in December 2025?

**Perplexity** launched **Computer**, an orchestration-first agent platform featuring multi-model routing, usage-based pricing, and parallel asynchronous sub-agents for distributed workflows. **Andrej Karpathy** claims a "phase change" in coding agents since December, highlighting sustained long-horizon task completion. **OpenAI** released **GPT-5.3-Codex** with ~25% speed improvements and strong benchmark performance, while **Claude Code** celebrates its first year with ecosystem integrations and scaling challenges. This marks a significant shift in coding workflows and agent-based software development.