9 models · on the curve since 2023

xAI

Value position · the site’s read Mixed

xAI’s models live on the commoditising output layer, so its edge has to come from elsewhere. The durable bets are distribution through X and compute at Colossus scale.

What would change this readGrok opens a sustained quality lead the other labs cannot close, or X stops being a distribution advantage.

Recent cadence
4 in last 12 mo
3 the year before
Landmark density
4 / 9
defining releases
Weights
Closed / API
Grok 4.5 flagship

Founded 2023Bay Area, USA

The substrate underneath figures as of Aug 2026

Trains and serves on

It owns roughly a gigawatt and rents it out. COLOSSUS in Memphis and COLOSSUS II across Tennessee and Mississippi together carry about 1.0 GW, built in clusters of 110,000 GB200 and GB300 processors; Grok-5 is being trained there. It is also a compute SELLER: cloud agreements signed with Anthropic in May 2026 cover about 325,000 NVIDIA GPUs at $1.25B a month through 2029.

ConcentrationEvery processor in both COLOSSUS sites is NVIDIA silicon, so the entire AI segment rests on one chip vendor until the Tesla and Intel Terafab effort produces hardware.

Flagship, per million tokens

$2.00 in $6.00 out

grok-4.5, prompts to 200k

Weights
Partial and stale. Grok-1 weights are Apache 2.0 and Grok-2 sits under a custom community licence; everything from Grok-3 onward is closed, and a promised Grok-3 weights release has not happened.
Where you buy it
api.x.ai · Grok apps and X · Oracle Cloud Infrastructure · Azure AI Foundry · AWS Bedrock
Structure
No longer a standalone company. xAI was acquired by Space Exploration Technologies Corp in February 2026 and is now its AI segment; the group listed on Nasdaq as SPCX in June 2026 and rebranded the unit SpaceXAI in July. Dual-class stock gives Elon Musk about 82% of voting power, Class B holders elect 51% of the board, and SPCX takes the Nasdaq controlled-company exemptions.
Raised
About $17B privately before a $10B round at a $200B valuation (Sep 2025) and a $20B Series E (Jan 2026); the June 2026 SpaceX IPO raised roughly $74.4B net, with AI compute named first among its uses
Revenue
The AI segment turned over $818M in the quarter to 31 Mar 2026 and lost $2.47B from operations on it, against $7.7B of segment capex in the same quarter.
People
Over 22,000 across SpaceX (31 Mar 2026); the AI unit is not broken out

Biggest single dependencyOne individual holds roughly 82% of the voting power of a newly public company whose AI segment lost $2.47B on $818M of revenue in a single quarter, and every processor it trains on comes from a single vendor.

The revenue figure is not Grok revenue. The AI segment as defined in the prospectus includes X, and the company states that in 2023 and 2024 substantially all segment revenue was X advertising, subscriptions and data licensing; no Grok-only figure is disclosed. No price trajectory is shown because there was nothing to compare against — xAI had no public API and no list price two years ago. The $250B acquisition and $1.25T combined valuations are press-reported; the acquisition itself is confirmed in the filing.

On the durability curve frontier era
2023202420252026 Grok-1Grok 4.5 ARCHITECTURE the substrate · compounds  → OUTPUT per model · commoditises  → CROSSOVER the durability thesis  → DURABLE VALUE-CAPTURE ↑ the margin a release keeps · not raw capability TIME · FRONTIER MODEL RELEASES →
Output · value a model keeps Architecture · the compounding substrate xAI release

Hover any point to read the release. The y-axis is qualitative; only the x-axis carries dates.

When to reach for them practical read
Live context
Reach for Grok when the task wants real-time signal from X (Grok-1, Nov 2023).
Frontier reasoning
Pick Grok 4 for a top reasoning model trained at Colossus scale (Jul 2025).
The landmark releases 4 of 9 models
  1. Jul 2026 Grok 4.5 Latest Described by Musk as an Opus-class model; trained partly on real coding-session data Current
  2. Jul 2025 Grok 4 Reasoning flagship, benchmark leader ReasoningFlagship
  3. Feb 2025 Grok-3 Colossus-trained flagship ColossusFlagship
  4. Nov 2023 Grok-1 First Grok, launched inside X On XFirst Grok
Full release logall 9, newest first
  1. 2026
  2. Jul Grok 4.5 ◆ Described by Musk as an Opus-class model; trained partly on real coding-session data Current
  3. Apr Grok 4.3 Beta Latest beta BetaCurrent
  4. Feb Grok 4.2 Beta Beta release Beta
  5. 2025
  6. Nov Grok 4.1 Broad rollout upgrade Upgrade
  7. Jul Grok 4 ◆ Reasoning flagship, benchmark leader ReasoningFlagship
  8. Feb Grok-3 ◆ Colossus-trained flagship ColossusFlagship
  9. 2024
  10. Aug Grok-2 Added image generation Image
  11. May Grok-1.5 Longer context and reasoning ReasoningLong ctx
  12. 2023
  13. Nov Grok-1 ◆ First Grok, launched inside X On XFirst Grok
Where they sit on weights versus the field
Open weights
DeepSeek Moonshot AI Zhipu (Z.ai)
Mixed
Google Meta Mistral AI Alibaba (Qwen)
Closed / API
OpenAI Anthropic xAI
The durability take on xAI from the archive
The SpaceX IPO Is Not What You Think You're Buying The filing will not just price rockets. It will reveal which layer public investors actually own. Read → Right Company, Wrong Vector A pick is a number. A position is a vector. The post-mortem language we have only knows how to blame the company. Read → The Model Is Not the Moat If frontier capability keeps centralising, the durable edge shifts outward into trust, workflow fit, and the surrounding package. Read →
About xAI at a glance
Founded
2023
HQ
Bay Area, USA
Leadership
Elon Musk
Owner
SpaceX (acq. 2026)
Flagship
Grok 4.5
Weights
Closed / API
Entity
SpaceX AI segment (Nasdaq: SPCX)
Infrastructure
Colossus, Memphis
Also builds
Grok in X

Founded March 2023 by Elon Musk, headquartered in the San Francisco Bay Area with its Colossus supercluster in Memphis. It builds the Grok models, tightly integrated with X, and was acquired by SpaceX in an all-stock deal in February 2026.

The frontier chart → Read the archive →