xAI (SpaceXSI)

What xAI does

SpaceX's Form 10-Q describes its AI segment as a vertically integrated AI platform. It spans the Grok frontier language model, AI solutions for consumers and enterprises, the X platform, and AI computing infrastructure.4

• For consumers, Grok is an AI assistant on the web and in mobile apps, with chat, Grok Imagine for images and video, voice conversations, file analysis, connectors to email, files, and calendar, and Grok Bot. Paid SuperGrok plans raise usage limits, and Business and Enterprise plans add team workspaces and organization controls.82
• For developers, xAI's API offers Grok models for code, text, voice, image, and video. Its quickstart uses the OpenAI client library pointed at api.x.ai.1
• For organizations, xAI launched Grok Business and Grok Enterprise on December 30, 2025. xAI says customer data in these plans is not used for training.39
• xAI also sells computing capacity. SpaceX's 10-Q says that in 2026 the AI segment entered into cloud services arrangements that give customers continuous access to reserved compute capacity. On May 6, 2026, xAI announced that Anthropic would get access to its Colossus 1 supercomputer.442
• xAI sells to governments under the name xAI for Government, launched on July 14, 2025. SpaceX's draft registration statement defines "xAI Gov" as its offering that gives government customers access to Grok models and related tools.306
• Grokipedia is an online encyclopedia whose footer reads "© 2026 SpaceXAI". The site says its articles are written and fact-checked by Grok and corrected by readers. On October 11, 2026, it was labeled version 0.3.93
• SpaceX's March 2026 draft registration statement says it is developing Macrohard, an agentic AI platform. It calls Macrohard a joint AI project with Tesla, built to emulate digital workflows and help people operate computers.6

Grok models over time

On October 11, 2026, xAI's API models page listed these text models: grok-4.7, grok-4.6, grok-4.5, grok-4.3, the Grok 4.20 variants, and grok-build-0.1. It also listed Grok Imagine image and video models and a speech-to-speech voice model.15

• Grok launched on November 3, 2023, running on Grok-1. On March 17, 2024, xAI published the Grok-1 base model weights and architecture under Apache 2.0. It describes the model as a 314-billion-parameter mixture-of-experts model.218
• Grok-1.5, announced March 28, 2024, extended the context window to 128,000 tokens. Grok-1.5V, previewed April 12, 2024, added image understanding. With it, xAI released the RealWorldQA benchmark under a CC BY-ND 4.0 license.2223
• On August 13, 2024, Grok-2 and Grok-2 mini went into beta on X. In December 2024 the API gained grok-2-1212 and grok-2-vision-1212. Grok 2 weights went on Hugging Face in August 2025 under the xAI Community License Agreement.24269912
• Grok 3 and Grok 3 mini arrived on February 19, 2025, adding a "Think" reasoning mode, the DeepSearch research agent, and a 1-million-token context window. The Grok 3 models became generally available on the API in April 2025.2720
• Grok 4 and Grok 4 Heavy were released on July 9, 2025, with native tool use and real-time search. Grok 4 Heavy runs several lines of reasoning in parallel, and the Grok 4 API had a 256,000-token context window.28
• Several models followed in late 2025: grok-code-fast-1 for agentic coding (August 28), Grok 4 Fast with a 2-million-token context (September 19), Grok 4.1 for conversation (November 17), and Grok 4.1 Fast for tool calling (November 19).31323536
• Grok 4.20 and Grok 4.20 Multi-agent went live in March 2026, both with a 1-million-token context window. The multi-agent version, still in beta, runs 4 or 16 cooperating agents for in-depth research. Its system card is dated April 7, 2026.20908775
• xAI's documentation lists grok-4.3 with a 1-million-token context window and text and image input. It describes the model as fast and reliable, with strong tool calling and instruction following. The documentation gives no release date.89
• Grok 4.5 was released on July 16, 2026. xAI says it was trained alongside Cursor on tens of thousands of NVIDIA GB300 GPUs. SpaceX's second-quarter results say it incorporates SpaceX's 1.5-trillion-parameter V9 foundation model.5296
• Grok 4.6 (August 12, 2026) and Grok 4.7 (September 21, 2026) followed. Both have a 500,000-token context window, accept text and images, produce text, and support low, medium, high, and xhigh reasoning effort. Grok 4.7 has a pretraining data cutoff of June 2026.59669178
• Grok 4.7 Fast is the same model as Grok 4.7. The release notes say it is offered only in Cursor and Grok Build, not on the public API.20
• On May 15, 2026, xAI retired several older API models: grok-3, grok-4-0709, the Grok 4 Fast and Grok 4.1 Fast models, grok-code-fast-1, and grok-imagine-image-pro. Requests to those names now go to grok-4.3, grok-build-0.1, or grok-imagine-image-quality.88

Apps, API, and where Grok is available

• The Grok assistant runs on grok.com and in iOS and Android apps. Signing in keeps conversations, settings, and subscriptions in sync across them.82
• xAI's help pages name the plans: a no-subscription tier, SuperGrok, SuperGrok Heavy, and X Premium, including X Premium+. Linking an X account lets xAI apply X subscription benefits. X handles X Premium subscriptions, and SpaceXAI does not oversee X's service operations. Companions are offered only in the iOS app.83
• Grok is also built into X, including the "@grok" bot and a "Grok Explain" feature. xAI publishes their system prompts on GitHub. Grok 4.5 reached grok.com, X, and the iOS and Android apps on July 22, 2026.7953
• xAI says Grok runs in Tesla vehicles using the same voice technology as its Voice Agent API. There it can check vehicle status, look up directions, and control navigation.38
• The API offers chat and Responses endpoints, function calling, structured outputs, a Batch API, Files and Collections storage, and server-side tools such as web search, X search, code execution, and remote MCP servers.12036
• A US regional endpoint, us.api.x.ai, serves grok-4.7 and grok-4.6. xAI says it keeps request handling, inference, safety moderation, and retained request data in the United States, but files, collections, and server-side tools are not covered.81
• Grok 4.5 through 4.7 are offered in Cursor on every plan tier. They are also reachable through model gateways including OpenRouter, Vercel, Cloudflare, Snowflake, and Databricks Mosaic.767778
• Grok is also available on cloud platforms. xAI announced Databricks Agent Bricks on June 18, 2026, noting Amazon Bedrock in the same post, and Google's Gemini Enterprise Agent Platform for Grok 4.6 on August 21, 2026.4961
• Grok works inside Microsoft Word, Excel, PowerPoint, and Outlook through Microsoft 365 add-ins (Grok for Word was announced June 18, 2026). A Google Workspace add-on for Docs, Sheets, and Slides was announced July 24, 2026.485354
• Grok Enterprise adds single sign-on, directory sync (SCIM), and audit and security controls. An add-on called Enterprise Vault provides a dedicated data plane, application-level encryption, and customer-managed encryption keys.39

Grok Imagine and Grok Voice

• On December 9, 2024, xAI released Aurora on X. It is an image generation model that xAI describes as an autoregressive mixture-of-experts network.25
• The Grok Imagine API launched on January 28, 2026. It makes video with native audio from images or text and edits existing video. It is also offered through partners including fal, ComfyUI, Invideo, Flora, and HeyGen.40
• Imagine Video 1.5 came in three steps: an API preview on June 3, 2026; general release on June 16, 2026, with Video 1.5 Fast on grok.com/imagine and the mobile apps; and on July 31, 2026, image and voice references, text-to-video, and native 1080p output.464756
• Imagine Image 2.0 was released on August 7, 2026, as Quality Mode on grok.com/imagine and the mobile apps, and as grok-imagine-image-2.0 on the API. The older grok-imagine-image-quality model retires on November 2, 2026.5720
• xAI's Imagine documentation lists videos of up to 15 seconds, and up to 14 reference images and 3 voice references on grok-imagine-video-1.5. It says generated media is subject to content policy review and is not used for training.85
• The Grok Voice Agent API launched on December 17, 2025. It follows the OpenAI Realtime API specification and has an official LiveKit plugin. On October 11, 2026, the alias grok-voice-latest pointed to grok-voice-think-fast-2.0.388620
• Text-to-Speech became generally available in March 2026 and Speech to Text in April 2026. grok-voice-transcribe-2.0 became the default speech-to-text model in September 2026, and version 1.0 reached end of life on October 2, 2026. The documentation says speech to text supports more than 38 languages.2086
• Custom Voices, announced April 30, 2026, clones a voice from a short recording. Speakers verify by reading a passphrase, and xAI says people cannot clone pre-existing recordings or someone else's voice.41
• The Voice Agent Builder, a no-code tool for setting up phone and web voice agents on Grok Voice, entered beta on July 1, 2026.50

Coding and agent products

• grok-code-fast-1, announced August 28, 2025, was a reasoning model for agentic coding. It was initially released quietly under the codename "sonic" and was offered through partners including GitHub Copilot, Cursor, Cline, and Windsurf.31
• Grok Build, a coding agent that runs in the terminal, launched in early beta on May 25, 2026, for SuperGrok and X Premium Plus subscribers. It has a plan review mode, parallel subagents, and support for AGENTS.md files, plugins, hooks, skills, and MCP servers. It can also run without a screen in scripts, and other apps can use it through the Agent Client Protocol.44
• xAI released Grok Build's source code on July 15, 2026. The repository puts xAI's own code under Apache 2.0, ships prebuilt binaries for macOS, Linux, and Windows, and does not accept outside contributions.5111
• The model behind Grok Build, grok-build-0.1, went into early access in May 2026 and into a public API beta on May 29, 2026. Since May 15, 2026, requests to grok-code-fast-1 have gone to it.204588
• Grok also builds apps, games, websites, and dashboards from a description inside a chat. This started as Build Mode for SuperGrok Heavy on July 28, 2026, and opened to every plan on web, iOS, and Android on August 19, 2026. Published apps get a grok.me address.5560
• Grok Bot entered beta on August 11, 2026. Each Bot has its own cloud computer, signs in to the tools a team uses, and asks for approval when needed. The help pages list apps for macOS, Windows, Linux, iPhone, iPad, and Android. Grok Bot uses Cursor accounts and sign-in.5884
• On August 26, 2026, Grok Bot was added to SuperGrok and Cursor plans. An X connector followed on August 29, 2026, and an enterprise version with access, network, and audit controls on September 3, 2026.626365
• Team Bots, shared Bots with their own context, plugins, credentials, and memory, entered public beta on Teams and Enterprise plans on September 28, 2026.68
• Cursor announced a model-training partnership with SpaceX on April 21, 2026, to use SpaceXAI's Colossus infrastructure. xAI's model cards say Grok 4.5, 4.6, and 4.7 received extra training on anonymized Cursor workflow data.947678

Safety, policies, and data use

• xAI published a draft Risk Management Framework on February 20, 2025, and a Risk Management Framework on August 20, 2025. Both focus on two kinds of risk: malicious use and loss of control. The 2025 framework sorts the model behaviors it checks into abuse potential, concerning tendencies, and dual-use capabilities.6970
• Its Frontier Artificial Intelligence Framework, last updated December 30, 2025, says it complies with California's Transparency in Frontier Artificial Intelligence Act. It covers public transparency, third-party review, and information security.71
• xAI has published safety model cards for Grok 4 (August 20, 2025), Grok 4 Fast (September 19, 2025), and Grok 4.1 (November 17, 2025), and a Grok 4.20 system card (April 7, 2026). The 2026 cards for Grok 4.5, 4.6, and 4.7 are dated July 14, August 12, and September 21, 2026.72737475767778
• The 2026 model cards say use of the models is subject to SpaceXAI's Acceptable Use Policy and its Consumer and Enterprise Terms of Service. They also say the models are not meant to make high-stakes decisions on their own in medicine, law, finance, or safety-critical systems without human oversight and expert checks.7678
• The Grok 4.1 model card describes input filters that reject certain sensitive requests, such as those involving biological or chemical weapons, self-harm, or child sexual abuse material. For Grok 4.7, xAI announced a new safeguard stack and invite-only red-team access for selected cybersecurity partners.7466
• xAI publishes system prompts for its consumer Grok products and some API models in the xai-org/grok-prompts repository, licensed under AGPL-3.0.7973
• xAI's API security FAQ says requests and responses are stored encrypted for 30 days so abuse can be checked, are not used for training, and are then deleted. It says xAI never trains on API inputs or outputs without explicit permission. Teams can turn on Zero Data Retention, and xAI says it is SOC 2 Type 2 compliant.80
• In September 2026 the API added a safety_identifier field. Apps can use it to tie policy violations to the individual people using the app.20
• On September 1, 2026, xAI published an outside evaluation of Grok 4.6 by LatchBio. It tested whether the model can tell routine biology work from requests that hide a biosecurity hazard, and whether it can carry out pathogen surveillance work.64

Colossus and compute infrastructure

• SpaceX's March 2026 draft registration statement names three data centers. COLOSSUS is the flagship, on Paul R. Lowry Road in Memphis, Tennessee. MACROHARD is on Tulane Road in Memphis. MACROHARDRR in Southaven, Mississippi, is described as the next phase of expansion.6
• The same filing says the initial COLOSSUS cluster came online in 122 days inside the shell of a former factory, and the initial MACROHARD cluster came online in 91 days.6
• The filing says COLOSSUS and MACROHARD together provide 0.7 gigawatts of compute power. It puts the AI segment's nameplate compute draw at 0.8 gigawatts for 2025, up from 0.3 gigawatts in 2024, and says its data centers rely significantly on natural gas and gas turbines.6
• SpaceX's second-quarter 2026 results say it expanded compute capacity to 1.4 gigawatts and continued building out Colossus II.96
• xAI says Grok 3 was trained on its Colossus supercluster. For Grok 4, xAI says it used Colossus, a 200,000-GPU cluster, to run reinforcement learning at pretraining scale.2728
• In May 2026 xAI described Colossus 1 as having more than 220,000 NVIDIA GPUs, including H100, H200, and GB200 chips. The same announcement said xAI and Anthropic had discussed working together on computing in orbit.42
• SpaceX's draft registration statement describes plans for orbital AI compute: satellites acting as data centers in orbit, powered by sunlight. It also describes TERAFAB, a chip manufacturing effort with Tesla announced in March 2026.6
• On November 19, 2025, xAI announced a partnership with Saudi Arabia and HUMAIN. The partners plan to design, build, and run new GPU data centers in Saudi Arabia.37

Corporate structure and governance

• X.AI Corp. is a Nevada corporation incorporated in 2023. Its SEC Form D filings list its principal place of business at 1450 Page Mill Road, Palo Alto, California.98
• X.AI Holdings Corp., a Nevada corporation, filed a Form D in January 2026 at the same Palo Alto address. It named Elon Musk as an executive officer and director and Jared Birchall as an executive officer.5
• On March 28, 2025, xAI acquired X Holdings Corp. and X.AI Corp. through share exchanges. On February 2, 2026, SpaceX acquired X.AI Holdings Corp., which became a wholly owned subsidiary. SpaceX accounts for this as a merger of companies under common control.4
• SpaceX's March 2026 draft registration statement defines "xAI" as X.AI Holdings LLC, or before the merger, X.AI Holdings Corp., together with its subsidiaries.6
• xAI's 2026 model cards say SpaceXAI is a doing-business-as name of XAI LLC. The footer of its website reads SpaceXAI LLC.787
• On August 14, 2026, a SpaceX subsidiary merged with Anysphere, Inc. (Cursor), which became a wholly owned SpaceX subsidiary. xAI says Cursor became part of SpaceXSI that day, and the two companies' support teams began merging.9767
• SpaceX's draft registration statement says the Irish Data Protection Commission opened a large-scale inquiry into GDPR compliance involving Grok within the X platform. It also says the Federal Trade Commission has undertaken an inquiry into the AI segment's chatbots, and that the segment faces ongoing litigation, including putative class actions.6

Government work

• On July 14, 2025, xAI launched xAI for Government, starting with U.S. government customers. It offers Grok models including Grok 4, Deep Search, and tool use, and is available to federal agencies through the GSA schedule. xAI also announced a contract with the Department of Defense the same day.30
• In the same announcement, xAI said it planned to offer custom models for national security and critical science, engineers with U.S. government clearances, and models for classified or restricted environments.30
• On September 25, 2025, GSA announced a OneGov agreement with xAI covering Grok 4 and Grok 4 Fast. It runs for 18 months, through March 2027, and includes dedicated xAI engineers, training, and a path to FedRAMP and DoD Impact Level-aligned enterprise subscriptions.3433
• SpaceX's draft registration statement says its business is subject to the Department of War's Cybersecurity Maturity Model Certification requirements.6
• Under the November 19, 2025 Saudi Arabia partnership, xAI said Grok would roll out across the country and be built into HUMAIN ONE, HUMAIN's agent platform, for government, business, and public use.37
• On December 22, 2025, xAI announced that the U.S. Department of War had selected its Frontier AI systems for the department's GenAI.mil suite, through a partnership with the department's Chief Digital and Artificial Intelligence Office (CDAO).29

Recent updates (July to October 2026)

• July 15–16, 2026: xAI released Grok Build's source code and launched Grok 4.5 in Grok Build, Cursor, and the API. On July 22, 2026, Grok 4.5 reached grok.com, X, and the mobile apps.515253
• July 24–31, 2026: xAI released the Google Workspace add-on (July 24), Build Mode (July 28), and reference-based video generation in Imagine Video 1.5 (July 31).545556
• August 7, 2026: xAI released Imagine Image 2.0 as Quality Mode in the Grok apps and as grok-imagine-image-2.0 on the API.57
• August 11–12, 2026: Grok Bot entered beta, and Grok 4.6 was released with a focus on long-running agents.5859
• August 14, 2026: SpaceX completed its acquisition of Cursor (Anysphere, Inc.).9795
• August 19–29, 2026: Grok's app building opened to every plan (August 19), Grok 4.6 came to Google's Gemini Enterprise Agent Platform (August 21), Grok Bot was added to more plans (August 26), and Grok Bot gained an X connector (August 29).60616263
• September 1–3, 2026: xAI published LatchBio's biosecurity evaluation of Grok 4.6 and launched Grok Bot for Enterprise.6465
• September 2026: The API added the safety_identifier field, and grok-voice-transcribe-2.0 became the default speech-to-text model.20
• September 21, 2026: Grok 4.7 was released, with a model card. Grok 4.7 Fast was offered only in Cursor and Grok Build. The model card says xAI plans to bring Grok 4.7 to its web and mobile apps and to X later.667820
• September 28, 2026: Team Bots entered public beta.68
• October 2, 2026: grok-voice-transcribe-1.0 reached end of life. On November 2, 2026, grok-imagine-image-quality is scheduled to retire.20
• October 11, 2026: xAI's developer documentation was titled SpaceXSI Docs and opened with "Get started with SpaceX Super Intelligence."1

Models and products lineup

Newest first. Status is as the official source describes it; “Legacy” and “Retired” entries stay listed for history.

Timeline

1. Mar 2023

   X.AI Corp. began operations.4

2. Nov 3, 2023

   xAI announced Grok, powered by Grok-1, in early access in the United States.21

3. Mar 17, 2024

   xAI published the Grok-1 base model weights and architecture under Apache 2.0.8

4. Mar 28, 2024

   xAI announced Grok-1.5 with a 128,000-token context window.22

5. Apr 12, 2024

   xAI previewed Grok-1.5V, which added image understanding.23

6. Aug 13, 2024

   Grok-2 and Grok-2 mini were released in beta on X.24

7. Nov 2024

   The xAI API launched in public beta.20

8. Dec 9, 2024

   xAI released the Aurora image generation model on X.25

9. Dec 12, 2024

   xAI made an updated Grok-2 available to everyone on X and added grok-2-1212 to the API.26

10. Feb 19, 2025

    xAI released Grok 3 and Grok 3 mini in beta, with Think mode and DeepSearch.27

11. Feb 20, 2025

    xAI published a draft Risk Management Framework.69

12. Mar 28, 2025

    xAI acquired X Holdings Corp. and X.AI Corp., which became its wholly owned subsidiaries.4

13. Jul 9, 2025

    xAI released Grok 4 and Grok 4 Heavy.28

14. Jul 14, 2025

    xAI launched xAI for Government and announced a contract with the Department of Defense.30

15. Aug 20, 2025

    xAI published its Risk Management Framework and the Grok 4 model card.7072

16. Aug 22, 2025

    xAI published Grok 2 weights on Hugging Face.9912

17. Aug 28, 2025

    xAI released grok-code-fast-1 for agentic coding.31

18. Sep 19, 2025

    xAI released Grok 4 Fast with a 2-million-token context window.32

19. Sep 25, 2025

    GSA announced a OneGov agreement making Grok 4 and Grok 4 Fast available to federal agencies.3433

20. Nov 17, 2025

    xAI released Grok 4.1 on grok.com, X, and the mobile apps.35

21. Nov 19, 2025

    xAI launched Grok 4.1 Fast and the Agent Tools API, and announced its Saudi Arabia partnership with HUMAIN.3637

22. Dec 17, 2025

    xAI launched the Grok Voice Agent API.38

23. Dec 30, 2025

    xAI launched Grok Business and Grok Enterprise and updated its Frontier Artificial Intelligence Framework.3971

24. Jan 28, 2026

    xAI launched the Grok Imagine API for video and image generation.40

25. Feb 2, 2026

    SpaceX completed its acquisition of xAI, which became a wholly owned subsidiary.74

26. Mar 2026

    Grok 4.20 and Grok 4.20 Multi-agent went live on the API.20

27. Apr 21, 2026

    Cursor announced a model-training partnership with SpaceX using Colossus.94

28. May 6, 2026

    xAI announced that Anthropic would get access to its Colossus 1 supercomputer.42

29. May 15, 2026

    xAI retired grok-3, grok-4-0709, the Grok 4 Fast and 4.1 Fast models, and grok-code-fast-1 from its API.88

30. May 25, 2026

    xAI launched Grok Build, a terminal coding agent, in early beta.44

31. Jun 16, 2026

    xAI released Grok Imagine Video 1.5 on the API and in the Grok apps.47

32. Jul 16, 2026

    xAI released Grok 4.5, trained alongside Cursor.52

33. Aug 11, 2026

    xAI launched Grok Bot in beta.58

34. Aug 12, 2026

    xAI released Grok 4.6.59

35. Aug 14, 2026

    SpaceX completed its acquisition of Cursor (Anysphere, Inc.).9795

36. Sep 3, 2026

    xAI made Grok Bot available to enterprises.65

37. Sep 21, 2026

    xAI released Grok 4.7 and its model card.6678

38. Sep 28, 2026

    xAI launched Team Bots in public beta.68

39. Oct 2, 2026

    The grok-voice-transcribe-1.0 speech-to-text model reached end of life.20

Leadership

Titles as the official source lists them.

• Elon Musk

  Executive Officer and Director (X.AI Holdings Corp.)5

• Jared Birchall

  Executive Officer (X.AI Holdings Corp.); Corporate Secretary (X.AI Corp.)598

• Bret Johnsen

  Chief Financial Officer (Space Exploration Technologies Corp., xAI's parent)97