Sources & verification notes

Grok 4.3

• Exact identifier & access

  Identity and lifecycle apply to this exact identifier and serving surface.

  • Grok 4.3 ↗xAI · provider-authored · checked Sep 23, 2026

• First availability

  Effective May 5, 2026. Checked Sep 23, 2026.

  Official @SpaceXAI post (read via X's oEmbed endpoint), 16:39 UTC May 5, 2026. The xAI release notes have no Grok 4.3 entry; the docs models page archived 2026-04-28 does not list grok-4.3.

  • SpaceXAI on X: Grok 4.3 is now live on the xAI API ↗xAI · provider-authored · checked Sep 23, 2026

• First availability

  Effective Apr 30, 2026. Checked Sep 24, 2026.

  OpenRouter listed Grok 4.3 on the xAI API on April 30, 2026, and VentureBeat reported it available to all API users the next morning; the May 5 post came later.

  • Grok 4.3 - API Pricing & Benchmarks ↗OpenRouter · host-authored · checked Sep 24, 2026
  • xAI launches Grok 4.3 at an aggressively low price and a new fast, powerful voice cloning suite ↗VentureBeat · independent-authored · checked Sep 24, 2026

• Availability status

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  • API Pricing ↗xAI · provider-authored · checked Sep 23, 2026

• Capabilities & limits

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  Text and image input, text output; configurable reasoning none/low/medium/high/xhigh, default low.

  • Grok 4.3 ↗xAI · provider-authored · checked Sep 23, 2026

• Capabilities & limits

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  • Grok 4.3 ↗xAI · provider-authored · checked Sep 23, 2026

• Input price

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  USD per 1M tokens for prompts below 200k tokens.

  • API Pricing ↗xAI · provider-authored · checked Sep 23, 2026

• Output price

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  USD per 1M tokens for prompts below 200k tokens.

  • API Pricing ↗xAI · provider-authored · checked Sep 23, 2026

• Model card

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  • Grok 4.3 ↗xAI · provider-authored · checked Sep 23, 2026

• Official announcement

  Effective May 5, 2026. Checked Sep 23, 2026.

  No x.ai/news launch post for Grok 4.3 was found (x.ai/news/grok-4-3 returns 404); this is xAI's official X post.

  • SpaceXAI on X: Grok 4.3 is now live on the xAI API ↗xAI · provider-authored · checked Sep 23, 2026

• Full rate card

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  • Grok 4.3 ↗xAI · provider-authored · checked Sep 23, 2026
  • API Pricing ↗xAI · provider-authored · checked Sep 23, 2026

• License

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Not verified. These sources establish the identifier, not this missing fact.

  • Grok 4.3 ↗xAI · provider-authored · checked Sep 23, 2026