The AI race has shifted from developing larger models to perfecting the "harness" that surrounds them, according to a dev.to post. This harness, encompassing prompts, tools, and control flow, has become the new battleground for Big Tech companies like Anthropic, OpenAI, and Google. Differentiation now stems from how effectively these harnesses enable models to perform tasks, rather than inherent model superiority. Companies are investing in their harness ecosystems to create user lock-in and offer distinct functionalities, with Anthropic focusing on open protocols and reusable skills, while OpenAI emphasizes tool execution and an SDK for agentic loops. AI
IMPACT Focus on agent harnesses signals a shift towards more complex AI applications and potential for vendor lock-in.
RANK_REASON The item is an analysis of industry trends and strategies rather than a direct announcement of a new product or research.
- Agentic AI Foundation
- Anthropic
- Claude
- Claude Agent SDK
- Claude Code SDK
- GPT-5.6
- Linux Foundation
- LM Evaluation Harness
- MCP
- Microsoft
- OpenAI
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