Grok 4.3

Grok 4.3 is a reasoning model from xAI, now listed by OpenRouter under the name SpaceXAI, that suits people who want a one million token context at a low output price. xAI's model page lists $1.25 per million input tokens and $2.50 per million output tokens for prompts under 200,000 tokens, and $2.50 and $5.00 for the whole request once a prompt reaches 200,000 tokens, with cached input at $0.20 or $0.40. OpenRouter shows the same two price tiers on its cheapest route as listed on 5 November 2026, a context of 1,000,000 tokens, text, image and file input, and text output, with a listing date of 30 April 2026. The catch is age: xAI's page also lists Grok 4.5, 4.6 and 4.7, and recommends Grok 4.7 for code and chat, though it does not say which model replaces 4.3. The page does not mark 4.3 deprecated. Figures come from xAI's docs and the OpenRouter model list. We have not run it ourselves. We would use it for long-context reading jobs where price matters, and compare Grok 4.7 for hard coding tasks.