Unverified50% confidenceFactExact time

Claude Code and OpenAI Codex are both essentially a combination of a language model plus an execution harness, where the model proposes actions, the harness executes them, and results are fed back to the model in a loop until the model no longer requests any tool calls.

1

Sources

50%

Confidence

Long-term

Relevance

10/9/2026

First Seen

Sources

Inside the Agent Loop: How Claude Code and OpenAI Codex Actually Work

Related Entities

Claude Codeproduct Codexproduct Anthropiccompany OpenAIcompany

Related Claims

UnverifiedThe approach of focusing deeply on programming use cases, building a data flywheel, and training the next-generation model was originally validated by Anthropic with Claude Code, and subsequently replicated by OpenAI through Codex.76% similar UnverifiedCoding agents such as Codex and Claude Code are essentially software frameworks (Agent Harnesses) built around models, with the reasoning model serving as the engine that drives the system.73% similar

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