Dev Preference Score
88.4
Claude Code vs 64.2 Codex
Iterations to Green
2 vs 5
Claude: 2.5x faster loop
Context Compaction Loss
4.2% vs 28.6%
Prompt caching + tree-sitter
Est. Task Cost (USD)
$0.18 vs $0.34
47% lower token overhead
✦ Claude Code (Agentic CLI)
PASSED (2 iters)
◈ OpenAI Codex (Snippet Pipeline)
MANUAL ASSIST (5 iters)
Full Architectural Comparison Matrix
Empirical Breakdown
| Evaluation Metric | Claude Code (Terminal Agent) | OpenAI Codex (Completion) | Delta / Impact |
|---|---|---|---|
| Context Compaction Loss | 4.2% | 28.6% | -24.4% token context degradation |
| AST Diff Rejection Rate | 2.1% | 16.4% | 7.8x higher diff merge accuracy |
| Test-Driven Auto-Correction | Automated sub-agent rollback | Human manual inspection required | Autonomous test-green cycle |
| Survey Developer Satisfaction | 88.4 / 100 | 64.2 / 100 | Calibrated to 75.2% preference ratio |