Major model leaks: Opus 4.8, GPT-5.6, DeepSeek V4 Pro, Claude Sonnet 4.8

Ongoing leaks and releases; DeepSeek discount permanent. GPT-5.6 leak details (code names Iris/Ember/Beacon Alpha, multi-step reasoning, agentic workflows) and Claude Sonnet 4.8 leak with a June showdown against GPT-5.6 and Gemini 3.5 Pro. DeepSWE benchmark controversy adds context to current model performance.