Model Selection ComparisonsComparison

Claude vs Codex coding-agent behavior differences

March 27, 2026eric provencher

eric provencher contrasts Codex’s test-running workflow with Claude’s more deliberative style, reflecting how developers choose agents based on execution vs reasoning preferences in day-to-day coding.

Codex:
Writes unit tests and runs them
Claude:
"Good. Now let me trace through all the test cases mentally to make sure they pass"
eric provencher
coding agentsworkflowclaudecodex

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