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End of preview. Expand in Data Studio
cutoff-probe
Author: Dmitriy Semenkevich (dimhold)
This dataset measures where 7 Claude models actually stop knowing package releases: 552 npm and PyPI releases dated by the registries, 12 per month from 2023-01 to 2026-10, plus 200 versions that do not exist as a control.
Headline, from the repository README: "The 5.5 generation (the 4 models stated as Jun 2026, fable-5-1 included) falls to half of its 2024 level 6 to 9 months before the stated date: the last month at or above half is 2025-09 to 2025-12." False recognition of versions that do not exist: "0 of 400 for opus-5-5 and sonnet-5-5, at most 20 of 392 (5.1%) for haiku-4-5."
This is a mirror. The canonical home is the Zenodo record and the GitHub repository; verdicts, limitations and every table live there.
- Paper: https://dimhold.by/papers/cutoff-probe/
- Code and full write up: https://github.com/dimhold/cutoff-probe
- DOI: https://doi.org/10.5281/zenodo.23544586
Files
| path | what it is |
|---|---|
out/calls.jsonl |
the journal: every model call with prompt, reply, usage and cost, 1243 rows including the failed ones ("ok": false) |
battery.json |
the battery: 552 real releases and 200 nonexistent versions with per package metadata |
out/stats.json |
machine readable output of analyze.py |
stats.md |
all tables |
context-check.json |
what the CLI put in front of the prompt, quoted by 2 models (account email and run path redacted) |
out/*.log |
harness console logs |
Not mirrored here: data/releases.json (the raw version lists taken from the npm and PyPI registries) and prior/ (vendor documentation snapshots and Semantic Scholar responses). Both are third party material; get them from the GitHub repository.
How it was produced
Calls went through Claude Code CLI 2.1.302 with tools and MCP servers disabled, from an empty directory, in batches of 20 shuffled real and nonexistent versions, identical for every model. The model in each response envelope was checked against the requested one. A reply counts as correct when the model says it knows the version and names a month at most 1 away from the registry. Rows with "ok": false are failed calls and are skipped by the analysis. Timestamps are local machine time, GMT+3. The scripts that turn the journal into every number are in the GitHub repository.
Licence
MIT, code and data alike. Package names, versions and publication dates inside the battery and the prompts are facts from the public npm and PyPI registries. Third party registry metadata and vendor pages stay under their owners' terms (see LICENSE in the repository).
Citation
@misc{semenkevich2026cutoffprobe,
author = {Semenkevich, Dmitriy},
title = {cutoff-probe: where does a model's knowledge of package releases actually stop?},
year = {2026},
doi = {10.5281/zenodo.23544586},
url = {https://doi.org/10.5281/zenodo.23544586}
}
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