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model-research/findings/2026-04-26-04-gpt5-defaults-to-delegation-claude.md
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Rodin 6af8a6ee10 refactor(findings): split ALL-FINDINGS.md into per-experiment files
Break the monolithic 3249-line findings file into 29 individual files,
one per experiment. Each file is named YYYY-MM-DD-NN-slug.md for easy
chronological sorting and discovery.

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2026-05-06 07:15:50 -07:00

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# Finding 4: GPT-5 defaults to delegation; Claude defaults to doing the work
**Date:** 2026-04-26
**Task:** PR review delegation to sub-agents
**How we used them:** Both spawned as sub-agents from main session with
same task description, same pr-review skill file, same Gitea credentials.
Difference: GPT-5 got model override to gpt5, Sonnet used default model.
Both got full skill instructions.
- GPT-5 first attempt: spawned sub-sub-agents and timed out
- GPT-5 with "do it yourself, no sub-agents" + step-by-step: worked
- Even with constraints, GPT-5 sometimes dumps raw tool output instead of
synthesizing — needs explicit output format instructions
- Claude (Sonnet/Opus) given the same kind of task does the work directly
- **Takeaway:** GPT interprets complex task descriptions as delegation
opportunities. Claude interprets them as work to do. For GPT: explicit
single-actor instructions + output format. For Claude: can give broader
mandate. Same skill file, very different behavior.