Here are the models they use [0]. They best they do is Claude 2, hard pass.
[0] https://docs.gitlab.com/ee/user/ai_features.html#language-mo...
[0] https://docs.gitlab.com/ee/user/ai_features.html#language-mo...
You can follow the migration to Claude 3 in this public epic: https://gitlab.com/groups/gitlab-org/-/epics/13297