OpenAI’s push into advertising is gaining momentum, but early signs suggest that its first wave of ChatGPT ads may not yet be delivering clear results for brands. As the company experiments with monetizing its massive user base, advertisers are finding it difficult to measure whether these new formats are actually working. OpenAI has begun testing ads inside ChatGPT, initially rolling them out to a limited group of advertisers and users on free and lower-cost tiers. These ads are designed to appear alongside conversations, often tied to the context of what users are asking. I think the floodgates have already opened. I’m seeing ads on literally every single prompt now in ChatGPT (for a free account I have). Wow. https://t.co/IhM0mjBZfm pic.twitter.com/t37BRfiS84 However, according to reports, many of the first advertisers involved in these trials are struggling to prove the effectiveness of their campaigns.…