Issues

• catboost.utils.quantize() loads the whole dataset as raw floats before quantizing (regression since 1.2.3)

  catboost/catboost#3234 · Filter by author cryptothree opened on Oct 27, 2026

• CPU training: three speedups with bit-identical models

  catboost/catboost#3222 · Filter by author ArceniyVarlamov opened on Oct 24, 2026

• Pool mutates feature_tags defaults and breaks reuse for validation data

  catboost/catboost#3221 · Filter by author akshitkhokhani opened on Oct 20, 2026

• AUC returns 0 (not NaN or an error) when the evaluation set has a single class

  objectives and metrics
  Bug

  catboost/catboost#3218 · Filter by author gopain185 opened on Oct 17, 2026

• failed download titanic from storage.mds.yandex.net

  catboost/catboost#3215 · Filter by author shaul-chamoula opened on Oct 11, 2026
  1

• Support Python 3.15

  python
  Feature

  catboost/catboost#3213 · Filter by author andrey-khropov opened on Oct 10, 2026
  1

  

• CatBoostClassifier.score broadcasts single-column labels and reports incorrect accuracy

  python
  catboost/catboost#3211 · Filter by author parlorsky opened on Oct 7, 2026

• Python tests fail with Polars 2.0: get_categories was removed

  in progresspython
  Task

  catboost/catboost#3206 · Filter by author CheeseCakeyy opened on Oct 6, 2026
  

• unexpected model_shrink_rate default change

  catboost/catboost#3205 · Filter by author sergandri opened on Oct 2, 2026

• Add Node package tests to CI

  ciNode_js
  Task

  catboost/catboost#3196 · Filter by author andrey-khropov opened on Sep 17, 2026
  1

• Add Rust package tests to CI

  ciinferenceRust
  Task

  catboost/catboost#3195 · Filter by author andrey-khropov opened on Sep 17, 2026

• [CMake build cache] Select the most recent revision from those available in history

  ci
  Feature

  catboost/catboost#3191 · Filter by author andrey-khropov opened on Sep 10, 2026
  

• Add a parameter to set k-folds and train similarly to K-fold cross-validation for Ordered Boosting

  Feature

  catboost/catboost#3188 · Filter by author asdsadsaasd12312132 opened on Sep 7, 2026
  2

• [Suggestion] Plain + Ordered Boosting mode

  Feature

  catboost/catboost#3187 · Filter by author asdsadsaasd12312132 opened on Sep 5, 2026

• Add tests for models exported as code to CI

  citests
  Task

  catboost/catboost#3173 · Filter by author andrey-khropov opened on Aug 23, 2026

• [Generated C++ code applier] support C++ standards < 20 for models with categorical features

  inference
  catboost/catboost#3172 · Filter by author andrey-khropov opened on Aug 23, 2026
  1

• n_features_in_ is 0 for models restored via load_model, pickle, or deepcopy

  catboost/catboost#3145 · Filter by author stohirov opened on Jul 19, 2026
  1

• JSON model loader silently accepts malformed leaf_values (count not a multiple of 2^depth), producing a wrong ApproxDimension

  catboost/catboost#3137 · Filter by author FuturMix opened on Jul 16, 2026

• shrink(1) changes multiclass predictions instead of preserving the first tree (CatBoostClassifier 1.2.8 and 1.2.10)

  catboost/catboost#3136 · Filter by author eseglo opened on Jul 15, 2026
  1

• deadlock on a machine with a mixed-core ARM64 CPU

  LinuxNeed Research
  Bug

  catboost/catboost#3126 · Filter by author andrey-khropov opened on Jul 9, 2026
  4

• Python wheels missing license file

  python
  catboost/catboost#3118 · Filter by author david-cortes opened on Jun 18, 2026
  1

• Applicability of CatBoost on small dataset (n=96) for environmental geochemical modeling

  catboost/catboost#3117 · Filter by author tulipabiflora2006 opened on Jun 12, 2026
  4

• get_feature_names functionality was broken for R

  R
  catboost/catboost#3116 · Filter by author anatolix opened on Jun 11, 2026

• [GPU] Histogram launch divides by zero on an empty grid (host SIGFPE)

  catboost/catboost#3114 · Filter by author jeffdaily opened on Jun 10, 2026

• [GPU] Optimal-leaf-value kernel (MAE/MAPE/Quantile) bounds by object count instead of leaf count

  catboost/catboost#3113 · Filter by author jeffdaily opened on Jun 10, 2026