The blog post presents evidence suggesting that the model being served (gpt-5.6-luna) may not correspond with the model requested (gpt-6-astra) during API interactions with OpenAI's Codex. The author details specific server responses, request behaviors, and their observations over a significant period, implying that server-side decisions affect which model is served regardless of user choices or client-side settings. This raises concerns about transparency and accuracy in API responses.