large context window

xAI has released Grok 4.6, a text-and-image model featuring a 500K token context window. The model is priced at $2.00 per million input tokens and $6.00 per million output tokens, and is available now through OpenRouter's API.

OpenAI has released GPT-5.5 Pro, a high-capability model with a 1,050,000 token context window (922K input, 128K output) priced at $30 per million input tokens and $180 per million output tokens. The model supports text and image inputs and is optimized for deep reasoning, agentic coding, and multi-step workflows.