Continuously monitoring 311 active endpoints

LLM API outputs are unstable over time.

LLM APIs are opaque black boxes, even for open-weight models. TrackLLM continuously monitors them for undisclosed changes — cheaply — with logprob tracking (LT) where logprobs are exposed, and black-box border input tracking (B3IT) where they aren't. Small changes are fine, but they should be disclosed.

Endpoints monitored
959
311 active · 648 retired · 1,891 in the catalog
Models tracked
277
across 55 orgs
Providers
82
205 serving variants
Queries logged
15.6M
since Jun 2025
Changes detected
234
79 LT · 155 B3IT

Inria IRISA CNRS SequoIAQ
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Latest changes

how far each endpoint moved from its baseline All 234 changes →
7 Oct
Probe-prompt outputs shifted (total variation 0.26)
B3IT
6 Oct
Probe-prompt outputs shifted (total variation 0.22)
B3IT
4 Oct
Probe-prompt outputs shifted (total variation 0.27)
B3IT
4 Oct
Probe-prompt outputs shifted (total variation 0.24)
B3IT
3 Oct
Probe-prompt outputs shifted (total variation 0.23)
B3IT
3 Oct
Probe-prompt outputs shifted (total variation 0.48)
B3IT
3 Oct
Probe-prompt outputs shifted (total variation 0.22)
B3IT
3 Oct
Probe-prompt outputs shifted (total variation 0.28)
B3IT
2 Oct
Probe-prompt outputs shifted (total variation 0.40)
B3IT
1 Oct
Logprob averages moved 0.73 nats from baseline
LT
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Providers

detected changes per endpoint-year of LT monitoring All 82 providers →
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Endpoints

959 endpoints monitored, of 1,891 in the catalog · 234 changes across 182 endpoints All endpoints →
Endpoint Status Changes Methods Last change Drift from baseline
deepseek-v4-flash-0731streamlake/fp8changed 3 LTB3IT 9 Sep
hy3atlas-cloud/fp8changed 3 B3IT 28 Aug
claude-sonnet-4.5claude-on-awschanged 2 B3IT 9 Sep
deepseek-v4-flashparasail/fp8changed 2 B3IT 3 Oct
glm-5.2gmicloud/fp8changed 2 LTB3IT 29 Aug
glm-5.3-flashcloudflarechanged 2 B3IT 4 Oct
glm-5.3-flashdigitaloceanchanged 2 B3IT 3 Oct
gpt-4o-2024-05-13azurechanged 2 LT 21 May
gpt-4o-miniazurechanged 2 LTB3IT 23 May
hy3gmicloud/bf16changed 2 B3IT 27 Aug
More…

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}
}