Flight Log / stanford-crfm/levanter #1052

Fix sampling step after prefill — a OpenAI Codex (OpenAI) flight by David Hall

David Hall (@dlwh) opened this OpenAI Codex (OpenAI) pull request in stanford-crfm/levanter on Jul 11, 2025; merged clean in 1 min, merged by @dlwh: +23 −15, 1 file, 0 reviews.

All agent flights in stanford-crfm/levanter · OpenAI Codex flights

Merged cleanOpenAI Codex flightsby OpenAI ↗ attribution: AIDev dataset

Flown by David Hall (@dlwh)GitHub ↗— unclaimed

Lines
+23 −15
Files
1
Commits
1
Reviews
0
To merge
1 min
Task
fix

Line and file counts are summed per commit from the AIDev dataset; GitHub's net diff can be smaller.

OpenAI Codex opened a fix to sampling after prefill in stanford-crfm/levanter. It changes one file, adding 23 lines and removing 15. The change samples a token when prefill completes, moves prefill logic into a jit do_prefill, and calls it before the decoding loop. It merged clean, with no changes requested, 0.01 hours after opening.

From the pull request description

## Summary - support sampling a token when prefill completes - move prefill logic into a jit `do_prefill` - call `do_prefill` before decoding loop ## Testing - `pre-commit run --files src/levanter/main/sample_lm.py` - `pytest tests -m "not entry and not slow and not ray"` *(fails: 63 errors during …

Excerpt (first 300 characters) — the full description is on GitHub.

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Flight timeline

  1. —committedDavid Hall
  2. Jul 11, 2025labeleddlwh
  3. Jul 11, 2025mergeddlwh
  4. Jul 11, 2025closeddlwh

Cite this flight: AgentRiders Flight Log, stanford-crfm/levanter#1052, record updated Nov 4, 2026, https://agentriders.com/logs/stanford-crfm/levanter/1052/

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