xAI
xAI builds the Grok family of models with real-time knowledge from X (Twitter), strong reasoning capabilities, and the Grok Imagine image generator.
9 models from xAI on Railwail
Access every xAI model through Railwail's OpenAI-compatible API.
9 models available
Grok 4
xAI's flagship reasoning model with vision and tool use. 256k context, strong at complex reasoning and STEM tasks.
Grok 4.20 Reasoning
xAI's Grok 4.20 reasoning snapshot. Runs an extended thinking pass before answering for multi-step analysis, math and STEM, with a 1M token context window and strong agentic tool calling.
Grok 4.3
xAI's May 2026 flagship. 1M context, vision, always-on reasoning, real-time X/web retrieval via DeepSearch.
Grok 2 Vision
xAI's vision-capable Grok 2 snapshot. Image-in, text-out with strong multilingual instruction following.
Grok 4.1 Fast
xAI's cost-efficient high-throughput model. 2M context, optional reasoning, optimized for agentic loops and real-time apps.
Grok 4.20 (Non-Reasoning)
xAI's Grok 4.20 standard snapshot. Skips the extended thinking pass for lower-latency answers on tasks that do not need deep deliberation. 1M token context window.
Grok 4.20 Multi-Agent
xAI's Grok 4.20 multi-agent snapshot. Coordinates several specialized agents under one call to handle multi-step workflows that mix research, tool use and synthesis. 1M token context window.
Grok Build 0.1
xAI's Grok coding-focused model. Tuned for code generation and software development tasks with a 256k token context window for working over large codebases.
Grok Imagine Video
xAI video with native audio and lip-sync, up to 15s
Frequently asked questions
How is xAI pricing handled on Railwail?
Are there rate limits when using xAI via Railwail?
Which regions does xAI support through Railwail?
Is there a sandbox or free tier to test xAI models?
Start building with xAI today
Free credits on sign-up. No credit card required. Access xAI and 27+ other providers through a single API.