Reading up on DeepSeek V4 Pro

Harness Handbook provides a behavior‑level manual that maps agent harness actions to verifiable code, enabling understanding, auditing, and safe modification.

OpenRouter's Fusion, which synthesizes outputs from multiple language models via a judge model, outperformed individual frontier models including GPT-5.5 and Claude Opus 4.8 on deep research tasks, with a budget panel achieving near-frontier performance at half the cost.