AI Engineering

Oct 17, 2026 · Artificial Intelligence

UHP Protocol: Same Model, 2.1x Cost Difference Across Harnesses

The article introduces UHP (Unified Harness Protocol), a standard HTTP contract that abstracts AI agent harnesses like Codex and Claude Code, enabling seamless switching; benchmarks show identical models on the same task vary up to 2.1x in cost and 3.2x in latency depending on harness, while HarnessRouter reduces integration points from O(n²) to one.