[hypnagogic]

The ongoing model anchoring/grounding issue likely affects all GPT-4 checkpoints/variants, but is most prominent with the latest "gpt-4-turbo-2024-04-09" variant due to its most recent cutoff date, might imply deeper issues with the current model architecture, or at least how it's been updated:

See the issue: https://github.com/openai/openai-python/issues/1310

See also the original thread on OpenAI's developer forums (https://community.openai.com/t/gpt-4-turbo-2024-04-09-will-t...) for multiple confirmations on this issue.

Basically, without a separate declaration of the model variant in use in system message, even the latest gpt-4-turbo-2024-09 variant over the API might hallucinate being GPT-3 and its cutoff date being in 2021.

A test code snippet is included in the GitHub issue to A/B test the problem yourself with a reference question.