Grok 4.8
Soft rollout expected week of November 10, 2026
A 2.5 trillion parameter model on a rebuilt C++ stack. Musk says a fast version will handle most Grok Bot requests.
History
Grok timeline: every model, launch and milestone
Updated · First published · GrokShelf
Grok went from an idea Elon Musk registered in March 2023 to a family of models, apps and always-on agents. This timeline lists 53 dated moments: 16 model releases, the products built on them and the company changes around them, each with its source. The newest model you can use today is Grok 4.7.
4years of Grok
16model releases
53dated events
Grok 4.7current flagship
Up next
The full timeline
2026 23 events
Grok 4.8 finishes pre-training
Musk says Grok 4.8 is in reinforcement learning, with a soft rollout to Grok Bot users planned that week.
Watermark on API text
Text from current Grok models on the API carries an invisible watermark by default.
Grok Voice 3.0
Ranks first on Artificial Analysis' speech-to-speech index, at the same price as 2.0.
The X Subscription
Grok, Grok Bot, Cursor and X Premium on one plan.
SpaceX Super Intelligence (SpaceXSI)
Musk announces the new name; x.ai and the official accounts switch over the next week.
Grok 4.7
xAI's most powerful model for coding and knowledge work, now the flagship.
Musk's roadmap: 4.8, 4.9, then Grok 5
Musk says Grok 4.8 is a 2.5 trillion parameter model finishing training, with Grok 4.9 and Grok 5 to follow.
Grok Bot on more plans
Grok Bot comes to SuperGrok, Cursor Pro and all Cursor Teams plans.
Grok 4.6
A 500k token context window and four reasoning settings, built for long-running agents.
Grok Bot
Always-on agents with their own computer that work inside your tools and keep going 24/7.
Grok 4.5
xAI's smartest model for coding, agentic tasks and knowledge work, reaching all Grok apps a week later.
Grok Build
A coding agent that runs in your terminal, in early beta for SuperGrok and X Premium+.
Grok 4.20 on the API
Grok 4.20 and Grok 4.20 Multi-agent go live for developers.
SpaceX acquires xAI
An all-stock deal valuing xAI at $250 billion and SpaceX at $1 trillion.
2025 15 events
Grok 4.1 Fast and Agent Tools API
A tool-calling model and server-side tools for building agents on the API.
Musk outlines Grok 5
At the Baron Capital conference, Musk describes Grok 5 as a 6 trillion parameter model due in early 2026, with about a 10% chance of human-level intelligence.
Grokipedia
xAI launches Grokipedia, an online encyclopedia written with Grok.
Grok 2.5 weights released
xAI publishes Grok 2.5 weights under a source-available license with commercial limits.
Grok 4 and Grok 4 Heavy
Grok 4 ships with native tool use and real-time search, plus a SuperGrok Heavy plan for Grok 4 Heavy.
xAI merges with X
xAI acquires X in an all-stock deal valuing xAI at about $80 billion and X at about $33 billion.
Grok 3
Grok 3 launches with Think mode for reasoning and DeepSearch, trained on Colossus.
2024 11 events
Series C: $6 billion
Backers include a16z, BlackRock, Fidelity, Morgan Stanley, Sequoia Capital and Valor Equity Partners.
Grok for everyone on X
A faster Grok with better multilingual support becomes available to every X user, not only paid tiers.
Aurora image generation
A new autoregressive image model, code-named Aurora, comes to Grok on X.
Colossus is fully operational
xAI's Memphis supercomputer, built in 122 days, is fully running.
xAI API public beta
Developers can build on Grok models, with $25 of free API credits a month during the beta.
Series B: $6 billion
xAI raises $6 billion to bring its first products to market and build infrastructure.
Grok-1.5 reaches X Premium users
Grok-1.5 becomes the model behind Grok on X.
Grok-1.5 Vision preview
xAI's first multimodal model, reading documents, diagrams and photos.
Grok-1 weights released
xAI open-sources Grok-1: a 314 billion parameter Mixture-of-Experts model under the Apache 2.0 license.
2023 4 events
Grok opens to X Premium+
Grok rolls out to X Premium+ subscribers in the US, then more countries.
Grok is announced
xAI introduces Grok, an assistant modeled after the Hitchhiker's Guide to the Galaxy, with real-time knowledge from X. Early access opens to a small group of X Premium+ users.
xAI is announced
Musk announces xAI with a stated goal to "understand the true nature of the universe".
X.AI Corp is incorporated
Elon Musk registers X.AI Corp in Nevada, months before the company is public.
How this timeline is dated
Dates come from xAI's own news posts where they exist, otherwise from the linked source. When only the month is public, the entry shows the month. Announced means previewed or stated publicly; Launched means people could use it. Musk's plans are shown as his statements, not as release dates. For prices and context windows of current models, see the Grok API pricing guide; for the latest changes, follow Grok news.