OpenAI's recent release of GPT-4o, their new flagship model, presents a mixed picture regarding its benefits and drawbacks. While the model is claimed to offer improved speed, reduced verbosity, enhanced performance in non-English languages, and cost-effectiveness compared to GPT-4-turbo, early user feedback indicates some challenges. Users have reported issues with hard coding problems and instruction following, leading some to revert to previous versions due to specific regressions in JSON serialization and specialized formats. Despite these initial setbacks, GPT-4o's potential speed and cost advantages warrant cautious consideration for upgrades, with the necessity of closely monitoring use cases and being ready to roll back if needed. As more developers experiment with GPT-4o, further insights into its capabilities and limitations will emerge.