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Grok 4.3

Available · Language, Multimodal, Reasoning

Grok 4.3 is a language model in xAI's Grok line that takes text and images and returns text, rolled out as a beta in the Grok apps on 17 April 2026 and also offered on the xAI API and on Amazon Bedrock. xAI describes it as a newly pre-trained model at the scale of Grok 4.20 with an improved architecture. [1]entry of 2026-04-17, Grok 4.3 Beta [2] [3] Primary source

Timeline of Grok 4.3 →

Claims and evidence

  • Released Rolled out as Grok 4.3 Beta to SuperGrok and Premium+ subscribers in the Grok apps. No primary source checked gives the date of its API launch. Primary source[1]entry of 2026-04-17, Grok 4.3 Beta
  • Status AvailableListed as a current API model with pricing when checked on 2026-10-01; not named in any xAI retirement guide. Primary source[2]Details [4]Text API Pricing
  • Successor of Grok 4.20 EditorialEditorial link along the main Grok line: the release note describes Grok 4.3 as a new pre-trained model at the scale of Grok 4.20 with an improved architecture, but does not call it a successor. Primary source[1]entry of 2026-04-17, Grok 4.3 Beta
  • Change · Architecture xAI describes it as a newly pre-trained model at the same scale as Grok 4.20, with an improved architecture.Compared with Grok 4.20 Primary source[1]entry of 2026-04-17, Grok 4.3 Beta
  • Change · Training data xAI gives a knowledge cutoff of December 2025.Compared with Grok 4.20 Primary source[1]entry of 2026-04-17, Grok 4.3 Beta
  • Change · Reasoning Offered on the API as one model with configurable reasoning effort, including no reasoning, where Grok 4.20 has separate reasoning and non-reasoning model ids.Compared with Grok 4.20 Primary source[2] [4]Text API Pricing
  • Change · Tool use In the Grok apps the model can use a computer to write and run code and create files such as presentations, documents and spreadsheets.Compared with Grok 4.20 Primary source[1]entry of 2026-04-17, Grok 4.3 Beta
  • Input text, image Primary source[2]At a glance: Modalities
  • Output text Primary source[2]At a glance: Modalities
  • Context window 1,000,000 tokensAPI figure; requests above 200K prompt tokens are billed at a higher rate. Primary source[2]At a glance: Context window [5]Reasoning workloads
  • Parameters Not disclosedNot disclosed by xAI; the grok.com release note only says Grok 4.3 matches the scale of Grok 4.20. No claim madeNo source
  • Access consumer app, API, cloud partner Primary source[1]entry of 2026-04-17 [2] [3] [6]Enable Grok models in Model Garden

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