OpenAI has been buzzing with activity lately, first by open-sourcing the gpt-oss model series and subsequently launching the highly anticipated GPT-5. This new model not only embodies the ethos of being "the smartest, fastest, and most useful AI to date" but also marks a complete overhaul of its core functionalities. GPT-5 boasts built-in "thinking" capabilities and is now accessible to all users, including those who opt for the free tier.