Grok 4.3: Grok Build is now installed in Railway sandboxes https://t.co/cfNLseOCit

XAI released Grok 4.3 on April 17, 2026, with the Grok Build now installed in Railway sandboxes. The model has achieved a score of 8 on the GDP.pdf benchmark and ranks #57 on the LM Arena leaderboard with 37,636 votes.

xAI /providers/xai Grok 4.3 Is Grok 4.3 out yet? Yes. How we confirmed it Released via official access April 17, 2026 at 12:00 AM UTC Waiting for xAI's next model? One click creates your free account or signs you into an existing one and turns on alerts for xAI releases. There's no password to set, and you can unsubscribe any time. Benchmarks GDP.pdf Grok 4.3 High · via Epoch AI · captured Jul 3, 2026 · source https://epoch.ai/benchmarks/gdp-pdf 8 LM Arena 57 grok-4.3 · via LM Arena · 37,636 votes · captured Jul 3, 2026 · source https://lmarena.ai/leaderboard 1443.88 Sourced metrics mirrored with attribution — not community sentiment. Data from Epoch AI, “AI Benchmarking Hub” https://epoch.ai/benchmarks CC BY 4.0 . Vibe rating How this model actually feels to use, rated by the people here. No vibe ratings yet. Be the first. Sign in /signin to rate this model. Model Pulse How is this model behaving today? One check-in per person per day: the running record of “did they nerf it”. Resets at midnight UTC. No check-ins yet today. Be the first to log how this model is behaving. Sign in /signin Community consensus An AI summary of the public comments here. Not a sourced fact. Not enough public feedback yet to summarize. Add a comment to help build the picture. Compare Grok 4.3 with another model → /compare?models=grok-4-3 Also waiting on: ChatGPT 5.6 /models/chatgpt-5-6 , Gemini 3.5 Pro /models/gemini-3-5-pro , Claude Fable 5.1 /models/claude-fable-5-1 , Claude Mythos 5.1 /models/claude-mythos-5-1 Comments Missing a model, or wishing OutYet did something it doesn't? Tell us what to build /submit .