OpenAI officially launches GPT-5 with enhanced analytical reasoning, programming capabilities, and safety features while pursuing a $500 billion valuation. This milestone follows months of speculation and builds upon the foundation established by the 2023 GPT-4 release. The company asserts that interactions with GPT-5 now resemble conversations with field experts. CEO Sam Altman likened the experience to using the first Retina Display iPhone, noting it became irreplaceable after just one day of use. Though the "LIVE5TREAM" title hinted at the launch, the final reveal came after months of anticipation and an early GitHub leak. Unlike previous confusing model designations (o3, o4-mini, o3-mini-high), the straightforward GPT-5 moniker reflects OpenAI's simplified approach. GPT-5 integrates three models and a real-time routing system within a single chat interface. Simple queries receive instant responses while complex questions trigger "compute time" - extended processing periods for deeper analysis. When daily limits are reached, the gpt-5-mini or gpt-5-nano models automatically engage to maintain continuous interaction. Under the hood, coding capabilities show significant advancement. Demonstrations revealed GPT-5 constructing complete French learning web apps in seconds and achieving top scores on programming benchmarks like SWE-Bench and Aider Polyglot. Writing quality has also improved with more concise output and a 400,000-token context window. A key innovation is the model's uncertainty handling. Instead of generating false information when lacking knowledge, GPT-5 employs "safe completion" - delivering high-level guidance without fabricating facts. All users will now access GPT-5 by default with tiered plans offering increased limits. The Pro version unlocks extended reasoning time while API pricing starts at $1.25 per million input tokens, with cost-effective mini and nano options available for budget-sensitive applications.