How do you choose between Claude Code, Codex, and other coding agent harnesses for your software factory?

Coding agent harnesses such as Claude Code, Codex CLI, OpenCode, and Warp Agent should be selected by workflow rather than adopted as a single organization-wide standard, because a harness governs context, tools, permissions, sandboxing, instruction files, output formats, and automation behavior around a model. The proposed evaluation framework scores candidates on task fit, model and inference options, non-interactive operation, permission defaults, cost visibility, repository instruction support, CI authentication, and team familiarity. Suggested defaults include read-only Codex runs for low-risk triage, benchmark-tested tools for implementation, Claude Code for large refactors and frontend work, Codex for repeatable migrations and structured-output tasks, and model-agnostic or self-hosted options for regulated or high-volume workloads. Teams are encouraged to run controlled internal comparisons on completed real-world tasks, measure cost, latency, review effort, and downstream defects, retain human review gates, and repeat evaluations as models evolve. The discussion positions Warp Factories as a multi-harness control plane that can orchestrate version-controlled agent workflows across Claude Code, Codex, and Warp Agent while providing consistent governance, auditing, benchmarking, and performance metrics.

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