Expired50% confidenceFactExact time
Anthropic introduced the SKLD format configuration specification for defining AI programming agent behavioral guidelines and code style preferences, and OpenAI Codex immediately adopted the exact same filename and format specification.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Claude Code vs Codex: A Deep Comparison — Who Wins When the Tech Converges
bilibili学AI的乘风同学6/15/2026
Related Claims
UnverifiedAnthropic为Claude系列模型维护了一套独立的API规范，在消息结构、工具调用格式、流式事件类型等方面与OpenAI格式存在显著差异71% similarVerifiedThe AGENTS.md standard was originally proposed by OpenAI when releasing Codex CLI, aiming to provide a unified project-level instruction file for all AI programming agents.70% similarVerifiedThe two most powerful AI programming tools currently are OpenAI's Codex and Anthropic's Claude Code.70% similarUnverifiedHarness AI engineering-oriented programming defines global coding standards and architectural conventions through project-level specification files such as CLAUDE.md and .cursorrules69% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/46278API
curl https://kongchang.com/api/v1/knowledge/claims/46278MCP
get_claim(id=46278)