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Codex
Codex 5.5 XH
Beam Deflection Studio-CODEX-5.5-XH.html
Beam Deflection Studio
Structural mechanics-HTML / JSMedium
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Build an inspectable beam deflection studio with load cases, reactions, shear, moment, and deflection views.
identical sandbox - vite - node 20 - 1 attempt
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Claude Code
Opus 4.8 max thinking
beam-deflection-studio.html
3
latest notes
8
lab reports
2
failure cases
Desk
Important items
Latest
Why workflow notes should trigger retests before headline takes
Product-level workflow changes can alter real usefulness even when the underlying model story appears mostly unchanged.
April 14, 2026
Latest
Context claims only matter when they survive repo-scale tasks
Long-context positioning is useful only if the system maintains structure, scope control, and reviewer trust on actual engineering work.
April 10, 2026
Lab
Public result: same product brief, Claude Code and Codex branches
A public GitHub comparison where the same competitive-intelligence app prompts produced separate Claude Code and Codex implementations.
Low reviewer burden
Failure
Failure case: over-editing after only partial repository understanding
Do not reward broad patches built on shallow repository evidence.
April 4, 2026
Same prompt
Public comparisons
Credited source results visitors can inspect directly: original prompts, generated outputs, and raw code links.
Public Same-Prompt App BuildCredit preserved
FGV same-prompt app buildA public GitHub comparison where the same competitive-intelligence app prompts produced separate Claude Code and Codex implementations.
Public Same-Prompt CLI BuildCredit preserved
SWE-AF same-prompt todo CLIA public benchmark folder with generated Node.js todo CLI implementations from Claude Code and Codex using the same prompt.