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Mercury 2.5 Preview is Inception Labs' latest diffusion-based LLM (dLLM), generating and refining tokens in parallel rather than sequentially to reach 1,100+ tokens/second with a 260K-token context window. It delivers a 10+ point intelligence jump over Mercury 2 (comparable to cost-optimized frontier models like Claude Haiku 4.5 and Gemini 3.5 Flash-Lite) with tunable reasoning, parallel tool calls, and schema-aligned JSON output, and this preview targets latency-sensitive search agents, voice pipelines, and coding subagents.

GPT-6 Luna is the fast, low-cost tier of OpenAI's GPT-6 series (1.05M-token context, text, image, and file input, $0.10/$0.50 per million input/output tokens), released September 22, 2026 below GPT-6 Sol and the flagship GPT-6 Astra. It is built for high-volume tasks with a clear goal, such as summarization, extraction, classification, quick questions, and lightweight agentic steps.