OpenAI confirmed GPT-6 (internal codename Spud) for global launch on April 14, 2026. Pre-training finished March 17 and post-training wrapped ahead of the announcement. OpenAI claims GPT-6 beats GPT-5.4 by more than 40% on coding, reasoning, and agent tasks, with HumanEval past 95%, MATH around 85%, and agent task completion rising from 62% to 87%. The context window doubles to two million tokens, roughly 1.5 million words per conversation. A two-tier inference framework separates fast response generation (System-1) from slow logic verification (System-2). OpenAI claims this pushes hallucination rates below 0.1%, though independent verification is still pending. Pricing is $2.5 per million input tokens and $12 per million output tokens — materially cheaper than Anthropic's Opus 4.7 at $5/$25 and likely to pressure coding-assistant pricing across the stack.