Grok 3

Claims and evidence

• Released 19 February 2025The post says Grok 3 is now available to X Premium and Premium+ users on X and grok.com, as a beta; it also says the rollout to users would take place over the coming days. ● Primary source[1]closing section
• Retired 15 May 2026Effective 12:00 PM PT on the xAI API. ● Primary source[3]first paragraph
• Generally available on the xAI API 3 April 2025 ● Primary source[2]April 2025, Apr 3 [4]Our path of progress, 2025: Grok 3 API

• Status RetiredRetired from the xAI API; requests to grok-3 are served by grok-4.3. ● Primary source[3]list of retired models
• Replaced by Grok 4.3grok-3 redirects to grok-4.3 with reasoning effort none. ● Primary source[3]Recommended Replacements

• Successor of Grok-2 (December 2024 revision) EditorialEditorial link along the main Grok line: the announcement names no predecessor model, and the December 2024 Grok-2 was the current flagship before it. ● Primary source[1]

• Change · Context length Context window of 1 million tokens, which xAI called eight times larger than its previous models; the grok-3 API model page listed 131,072 tokens.Compared with Grok-2 (December 2024 revision) ● Primary source[1]Pretraining on a Massive Scale [5]At a glance
• Change · Reasoning Adds a beta reasoning mode, Grok 3 (Think), trained with large-scale reinforcement learning to think for seconds to minutes before answering.Compared with Grok-2 (December 2024 revision) ● Primary source[1]Thinking Harder: Test-time Compute and Reasoning
• Change · Other xAI says it trained Grok 3 on its Colossus supercluster with ten times the compute of earlier leading models.Compared with Grok-2 (December 2024 revision) ● Primary source[1]Pretraining on a Massive Scale
• Change · Tool use Launched together with DeepSearch, an xAI agent that searches for information and writes a summary report.Compared with Grok-2 (December 2024 revision) ● Primary source[1]

• Input textAs listed for the API model grok-3 (drawn as icons: text to text). The announcement also reports image and video understanding evaluations, which are not reflected here. ◐ Archived primary[5]At a glance, Modalities
• Output text ◐ Archived primary[5]At a glance, Modalities
• Feature Reasoning modeGrok 3 (Think), a beta reasoning mode at launch, switched on with the Think button. ● Primary source[1]Thinking Harder: Test-time Compute and Reasoning
• Context window 1 million tokens tokensThe xAI API model page listed a context window of 131,072 tokens for grok-3 (src.xai.grok-3-api-model-page). ● Primary source[1]Pretraining on a Massive Scale
• Parameters Not disclosedNot disclosed by xAI. No claim madeNo source
• Access consumer app, API ● Primary source[1]closing section [2]April 2025, Apr 3

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