OpenAI, Anthropic, Google, and others roll out agent and model updates

OpenAI's GPT-6.1 Sol Ultrafast is rolling out in the API, Codex, and ChatGPT Work, running up to 8x faster than Sol Standard at $12/$60 per million tokens. StepFun's Step 5 Preview, a 600B-parameter MoE model with 27B active parameters, is now on OpenRouter, and JetBrains released the open 12B MoE coding model Mellum2.1 under Apache 2.0.