anthropic

31 models, with 5 monitored endpoints (4 actively tracked, 1 no longer) across 3 providers. 3 of them show at least one detected change — the model version is nominally fixed, so the movement is in how it is served.

31
Models
5
Monitored endpoints
4
Actively tracked
4
Changes total
3
Providers

Models

Model Monitored endpoints Providers Changes Endpoints changed Last change
claude-sonnet-4.5 2 2 2 1/2 2026-09-09
claude-sonnet-4.6 2 2 1 1/2 2026-08-28
claude-haiku-4.5 retired
7 not selected · 1 retired
1 1 1 1/1 2026-02-25
claude-fable-5 untrackable
6 untrackable
0 0 — 0/0 —
claude-fable-5.1 untrackable
4 untrackable
0 0 — 0/0 —
claude-fable-5.1:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-fable-5:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-haiku-4.5:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-haiku-5.5 untrackable
10 untrackable
0 0 — 0/0 —
claude-haiku-5.5:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-opus-4.1 too expensive
1 too expensive
0 0 — 0/0 —
claude-opus-4.1:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-opus-4.5 not selected
4 not selected · 2 too expensive
0 0 — 0/0 —
claude-opus-4.5:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-opus-4.6 too expensive
3 too expensive · 3 not selected
0 0 — 0/0 —
claude-opus-4.6:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-opus-4.7 untrackable
8 untrackable
0 0 — 0/0 —
claude-opus-4.7:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-opus-4.8 untrackable
9 untrackable · 2 too expensive
0 0 — 0/0 —
claude-opus-4.8:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-opus-5 untrackable
9 untrackable · 2 too expensive
0 0 — 0/0 —
claude-opus-5.5 untrackable
9 untrackable · 2 too expensive
0 0 — 0/0 —
claude-opus-5.5:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-opus-5:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-sonnet-4 not selected
2 not selected
0 0 — 0/0 —
claude-sonnet-4.5:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-sonnet-4.6:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-sonnet-5 untrackable
10 untrackable
0 0 — 0/0 —
claude-sonnet-5.5 untrackable
6 untrackable · 2 too expensive
0 0 — 0/0 —
claude-sonnet-5.5:batch untrackable
1 untrackable
0 0 — 0/0 —
claude-sonnet-5:batch untrackable
1 untrackable
0 0 — 0/0 —
31 models · monitored since 2026-01-15

Timothée Chauvin, Erwan Le Merrer, François Taïani, Gilles Tredan (2026), "Log Probability Tracking of LLM APIs". ICLR 2026. https://arxiv.org/abs/2512.03816

Timothée Chauvin, Clément Lalanne, Erwan Le Merrer, Jean-Michel Loubes, François Taïani, Gilles Tredan (2026), "Token-Efficient Change Detection in LLM APIs". ICML 2026. https://arxiv.org/abs/2602.11083

@inproceedings{
chauvin2026log,
title={Log Probability Tracking of {LLM} {API}s},
author={Timothee Chauvin and Erwan Le Merrer and Francois Taiani and Gilles Tredan},
booktitle={The Fourteenth International Conference on Learning Representations},
year={2026},
url={https://openreview.net/forum?id=hFxivbAgVP}
}

@inproceedings{
chauvin2026tokenefficient,
title={Token-Efficient Change Detection in {LLM} {API}s},
author={Timothee Chauvin and Cl{\'e}ment Lalanne and Erwan Le Merrer and Jean-Michel Loubes and Francois Taiani and Gilles Tredan},
booktitle={Forty-third International Conference on Machine Learning},
year={2026},
url={https://openreview.net/forum?id=7cMlZZYZT0}
}