> xAI has 18 models on The Model Index, from Grok-1 (Nov 2023) to Grok 4.7 (21 Sep 2026). Its strongest is Grok 4.7, with an estimated index score of ~178 (GPT-4 = 100). 2 have open weights. [Models](https://themodelindex.org/models/) /[Labs](https://themodelindex.org/labs/) / xAI Lab · 18 models · since Nov 2023 # xAI xAI has 18 models on The Model Index, from Grok-1 (Nov 2023) to Grok 4.7 (21 Sep 2026). Its strongest is Grok 4.7, with an estimated index score of ~178 (GPT-4 = 100). 2 have open weights. 18 models tracked 2 open · 16 closed ~178 index score of Grok 4.7 estimate · not yet independently tested 21 Sep 2026 latest release Grok 4.7 6 current versions 12 replaced by newer ones ## Every model · newest first | | MODEL | RELEASED | WEIGHTS | INDEX SCORE | INPUT $/M | OUTPUT $/M | CONTEXT | | --- | --- | --- | --- | --- | --- | --- | --- | | | [Grok 4.7](https://themodelindex.org/models/grok-4-7/) | 21 Sep 2026 | CLOSED | ~178 | $2.0 | $6.0 | 500K | | 19 | [Grok 4.6 replaced](https://themodelindex.org/models/grok-4-6/) | 12 Aug 2026 | CLOSED | 170 | $2.0 | $6.0 | 500K | | 36 | [Grok 4.5 replaced](https://themodelindex.org/models/grok-4-5/) | 8 Jul 2026 | CLOSED | 163 | $2.0 | $6.0 | 500K | | | [Grok Build 0.1](https://themodelindex.org/models/grok-build-0-1/) | 20 May 2026 | CLOSED | not scored yet | $1.0 | $2.0 | 256K | | 56 | [Grok 4.3](https://themodelindex.org/models/grok-4-3/) | 17 Apr 2026 | CLOSED | 151 | – | – | – | | 42 | [Grok 4.20 replaced](https://themodelindex.org/models/grok-4-20/) | 17 Feb 2026 | CLOSED | 158 | $1.25 | $2.5 | 2M | | | [Grok 4.1 Fast](https://themodelindex.org/models/grok-4-1-fast/) | 19 Nov 2025 | CLOSED | not scored yet | – | – | – | | | [Grok 4.1 replaced](https://themodelindex.org/models/grok-4-1/) | 17 Nov 2025 | CLOSED | not scored yet | – | – | – | | 79 | [Grok 4 Fast replaced](https://themodelindex.org/models/grok-4-fast/) | 19 Sep 2025 | CLOSED | 143 | – | – | – | | | [Grok Code Fast 1](https://themodelindex.org/models/grok-code-fast-1/) | 28 Aug 2025 | CLOSED | not scored yet | – | – | – | | | [Grok 2.5 replaced](https://themodelindex.org/models/grok-2-5/) | 23 Aug 2025 | OPEN | not scored yet | – | – | – | | 64 | [Grok 4 replaced](https://themodelindex.org/models/grok-4/) | 9 Jul 2025 | CLOSED | 147 | – | – | – | | 110 | [Grok-3 mini](https://themodelindex.org/models/grok-3-mini/) | 9 Apr 2025 | CLOSED | 132 | – | – | – | | | [Grok 3 replaced](https://themodelindex.org/models/grok-3/) | 17 Feb 2025 | CLOSED | not scored yet | – | – | – | | 152 | [Grok-2 (Dec 2024) replaced](https://themodelindex.org/models/grok-2-dec-2024/) | 12 Dec 2024 | CLOSED | 112 | – | – | – | | | [Grok-2 replaced](https://themodelindex.org/models/grok-2/) | 13 Aug 2024 | CLOSED | not scored yet | – | – | – | | | [Grok-1.5 replaced](https://themodelindex.org/models/grok-1-5/) | 28 Mar 2024 | CLOSED | not scored yet | – | – | – | | | [Grok-1 replaced](https://themodelindex.org/models/grok-1/) | 4 Nov 2023 | OPEN | not scored yet | – | – | – | Index score is fitted from independent evaluations and scaled so GPT-4 = 100; a striped bar is an estimate for a model not yet independently tested. Prices are list prices per million tokens. ## Release history · 17 announcements [The Race →](https://themodelindex.org/race/) | DATE | RELEASE | KIND | SOURCE | | --- | --- | --- | --- | | 21 Sep 2026 | Grok 4.7 | Flagship | [x.ai ↗](https://x.ai/news/grok-4-7) | | 12 Aug 2026 | Grok 4.6 | Flagship | [x.ai ↗](https://x.ai/news/grok-4-6) | | 8 Jul 2026 | Grok 4.5 | Flagship | [x.ai ↗](https://x.ai/news/grok-4-5) | | 20 May 2026 | Grok Build 0.1 (coding) | Reasoning | [x.ai ↗](https://x.ai/news/grok-build-0-1) | | 17 Apr 2026 | Grok 4.3 (beta; API/GA 04-30) | Flagship | [docs.x.ai ↗](https://docs.x.ai/developers/models/grok-4.3) | | 17 Feb 2026 | Grok 4.20 (beta; GA/API 03-10) | Flagship | [docs.x.ai ↗](https://docs.x.ai/developers/models/grok-4.20) | | 19 Nov 2025 | Grok 4.1 Fast (+ Agent Tools API) | Small / fast | [x.ai ↗](https://x.ai/news/grok-4-1-fast) | | 17 Nov 2025 | Grok 4.1 | Flagship | [x.ai ↗](https://x.ai/news/grok-4-1) | | 19 Sep 2025 | Grok 4 Fast | Small / fast | [x.ai ↗](https://x.ai/news/grok-4-fast) | | 28 Aug 2025 | Grok Code Fast 1 | Small / fast | [x.ai ↗](https://x.ai/news/grok-code-fast-1) | | 23 Aug 2025 | Grok 2.5 open weights | Open weights | [techcrunch.com ↗](https://techcrunch.com/2025/08/24/elon-musk-says-xai-has-open-sourced-grok-2-5/) | | 9 Jul 2025 | Grok 4 (+ Heavy) | Flagship | [x.ai ↗](https://x.ai/news/grok-4) | | 17 Feb 2025 | Grok 3 (+ Grok 3 mini) | Flagship | [x.ai ↗](https://x.ai/news/grok-3) | | 13 Aug 2024 | Grok-2 | Flagship | [x.ai ↗](https://x.ai/news/grok-2) | | 28 Mar 2024 | Grok-1.5 | Flagship | [x.ai ↗](https://x.ai/news/grok-1.5) | | 17 Mar 2024 | Grok-1 open weights | Open weights | [x.ai ↗](https://x.ai/news/grok-os) | | 4 Nov 2023 | Grok-1 | Flagship | [en.wikipedia.org ↗](https://en.wikipedia.org/wiki/Grok_(chatbot)) | Dates come from each lab's own announcement, linked where one exists. --- Source: https://themodelindex.org/labs/xai/ · The Model Index · data as of 2026-10-01