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xAIGrok 4.3

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Grok 4.3 is an xAI frontier model for enterprise agents with configurable reasoning and a one-million-token context window.

Token context
1,000K tokens
Inputs
Text, Image
Outputs
Text
Released
Jun 17, 2026

Providers & Pricing

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ProviderInput / 1MOutput / 1MCache read / 1MCache write / 1MObservedEvidence
$1.25$2.50$0.20—Sep 3, 2026Provider-reported

Benchmarks

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LiveBench2026-06-2569.27percent11,1841,270grok-4.3average per caseRecomputedwinner eligibleThird-party benchmark
LMArena Agent Arenaagent-2026-08-31-011508720696-10.76score—62,791Grok 4.3 (High); 95% CI [-11.82702616, -9.69707800]; sessions 62791; observations 1645971; rank 50unknownOriginal sourcewinner eligibleThird-party benchmark
LMArena Agent Arenaagent-2026-08-31-011508720696-18.81score—82,745Grok 4.3; 95% CI [-20.43612107, -17.19188295]; sessions 82745; observations 1299547; rank 55unknownOriginal sourcewinner eligibleThird-party benchmark
LMArena Search Arenasearch-2026-08-24-0115087206961,164.80rating—91,483grok-4.3; 95% CI [1159.64698972, 1169.95391272]; votes 91483; rank 23unknownOriginal sourcewinner eligibleThird-party benchmark
LMArena Text Arenatext-2026-09-01-0115087206961,397.97rating—65,024grok-4.3; 95% CI [1394.22069381, 1401.72787538]; votes 65024; rank 141unknownOriginal sourcewinner eligibleThird-party benchmark
LMArena Vision Arenavision-2026-08-27-0115087206961,227.77rating—20,787grok-4.3; 95% CI [1221.16111143, 1234.37137614]; votes 20787; rank 65unknownOriginal sourcewinner eligibleThird-party benchmark
ToneBench2026-08-28-10-task-cd9819ab6e4d74.91points5,15450Grok 4.3 (high)average per caseOriginal sourcewinner eligibleThird-party benchmark
ToneBench2026-08-28-10-task-cd9819ab6e4d72.84points2,25350Grok 4.3average per caseOriginal sourcewinner eligibleThird-party benchmark

At a Glance

Model Facts

Identity

Status
active
Developer ID
grok-4.3
Released
Jun 17, 2026
Version
Grok 4.3
License
Unknown

Capacity

Token context
1,000K tokens
Maximum output
Unknown
Total parameters
Unknown
Active parameters
Unknown
Knowledge cutoff
Not reported

Interface and Access

Inputs
Text, Image
Outputs
Text
API available
Yes
Open weights
No
Self-hostable
No
Reasoning
Yes
Vision
Yes
Tool calling
Yes
Capabilities
chat, generation, reasoning, structured outputs, tools

This page represents one developer model product. Dated API snapshots, serving endpoints, pricing, regions, quantizations, and service tiers attach as versioned aliases or provider details and never create duplicate public model records.

Version Lineage

PredecessorUnknown
SuccessorsUnknown
Aliasesgrok-4.3, grok-4.3-latest

Explicit Unknowns

  • Maximum output
  • Architecture
  • Tokenizer
  • Knowledge cutoff

Primary Evidence

Sources and Observation Date

Grok 4.3 | SpaceXAI DocsxAI · observed Sep 3, 2026Grok Build 0.1 API pricingxAI · observed Sep 3, 2026Xai catalogXai · observed Sep 4, 2026

Comparable Peers

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Questions

Grok 4.3 FAQs

What is Grok 4.3?+

Grok 4.3 is an xAI frontier model for enterprise agents with configurable reasoning and a one-million-token context window. It is developed by xAI and its current sourced lifecycle status is active.

What inputs and outputs does Grok 4.3 support?+

Grok 4.3's current record lists Text and Image as input and Text as output.

How much context does Grok 4.3 support?+

The current record lists a 1,000K-token context window and does not report a maximum output length.

Is Grok 4.3 available through an API?+

Grok 4.3 is marked as API-available. The directly sourced provider records currently include Xai.

How much does Grok 4.3 cost through an API?+

The lowest directly sourced prices currently attached to Grok 4.3 are $1.25 per million input tokens through Xai and $2.50 per million output tokens through Xai. Prices are provider-specific and should be checked against each cited observation date.

What capabilities and tasks does Grok 4.3 support?+

Grok 4.3's recorded capabilities are chat, generation, reasoning, structured outputs, and tools. Its supported tasks are image, reasoning, and text.

Can Grok 4.3 be self-hosted?+

Grok 4.3 is not marked as an open-weight model. Self-hosting is marked as unsupported, with no license recorded.

Does Grok 4.3 have related versions or aliases?+

No predecessor is recorded. No successor is recorded. Recorded aliases are grok-4.3 and grok-4.3-latest.

Which models can Grok 4.3 be compared with?+

The current compatible peer set includes GPT-5.6 Sol, Claude Fable 5.1, Gemini 3.1 Pro, DeepSeek V4 Pro, and Grok 4.6. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →

How current is the Model Markets record for Grok 4.3?+

Grok 4.3 was last verified Sep 3, 2026 from xAI's primary source, “Grok 4.3 | SpaceXAI Docs.” The evidence is classified as official fact.

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