Grok 4.3 can create Slides

We are taking another small step today towards making Grok truly useful. For him to succeed he must exist in an environment where success is in the set of possible outcomes. The team is working to provide him access to same tools, context, and signals that we have in our lives.

Grok 4.20 Multi-Agent ⚡ Faster than a single agent 🎯 More accurate than four separate single agents The first steps in multi-threading of LLMs.

Grok 4.20: Multi-agent & Predictions

Single Agent - 4.20

Building Grok to 10x the productivity of everyone

One Team 🚀 x.ai/news/xai-joins-spacex

Introducing Grok Imagine 1.0, our biggest leap yet. 1.0 unlocks 10-second videos, 720p resolution, and dramatically better audio. Imagine has generated 1.245 billion videos in the last 30 days alone. Try it now: grok.com/imagine

Very old checkpoint from October

Mystery Model Revealed: the #1 model on Prediction Arena is an early Grok 4.20 checkpoint by @xai It made 10% returns on Prediction Arena in the last 2 weeks For context, the average return across all contracts on @Kalshi is -22% 🥈 is Opus 4.5 by @AnthropicAI with -2% 🥉 is GLM 4.7 by @Zai_org with -2% All models are still trading live at predictionarena.ai

🏆 In October, we invited external teams to submit to ForecastBench, our AI forecasting benchmark. The challenge? Beat superforecasters—using any tools available (scaffolding, ensembling, etc). The result? External submissions are now the most accurate models on our leaderboard—though superforecasters still hold #1. @xai's model (grok-4-fast) is the leading external submission, at #2. One of Cassi's entries takes the #3 spot Here's what changed. 🧵

No holiday party is complete without robot cage matches @xai

Was great judging at the @xAI coding competition, 420 contestants across 150 projects. So many talented engineers. Congrats to the winners, enjoy your trips to see the Starship launch!

4.20 is going to be a great model

We are hiring & rapidly grow post-training at xAI! The team is at the frontier of RLHF, agents, and reasoning efficiency—in just a few months, we climbed from nothing to #2-3 @arena, #1 Search Arena & other tool use benchmarks, #1-2 in creative writing, and are Pareto-optimal on intelligence-per-dollar @ArtificialAnlys. We are expanding work on new posttraining x reasoning recipes, code, multimodality, evals, and economic productivity. We are the smallest post-training team at a frontier lab, so you are guaranteed to be on the critical path. The structure is flat. Politics in territory claims do not exist. Compensation is competitive (& I will fight for you). Compute per capita is glorious. DM me if interested.

Coming back on here with some very happy (and belated!) news from @tylervstorm and I. I guess when they told us becoming co-founders is like getting married, we took it to heart.

Grok predicted the future 🔮

Exceptional humans are the ultimate progress multiplier If you are an exceptional builder with a passion for scaling winning teams join our new Talent Engineering Team

Grok4 Fast won at Search Arena! Showing how strong a lightweight model can be when it has good tools. Also, it is #8 on the standard Text Arena, best of its class, much ahead of Gemini-2.5-Flash #17 or O4-mini #25. The post-training team really cooked!