OpenAI launches GPT-5 API

OpenAI launched the GPT-5 API, making its most powerful model available to developers and enterprise customers for the first time. The API supports text generation, code generation, image understanding, and function calling. GPT-5 represents a significant capability jump over GPT-4, with improved reasoning, longer context windows, and better instruction following. Pricing has not been reduced from GPT-4 levels, reflecting the increased compute costs of running the larger model. The launch intensifies competition with Anthropic's Claude Opus 4.6 and Google's Gemini Ultra, which have been gaining market share in the enterprise API space.