xAI

Grok 4.3

CTX1M

78Quality

Reasoning · Vision · Tools

Input$1.25/M

Output$2.50/M

xAI's Grok for chat, coding, agentic tools, and lower hallucination risk

PaidProprietary872/1040

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xAITextUncommon

Grok 4.3

xAI's Grok for chat, coding, agentic tools, and lower hallucination risk

grok-4.3

Type: Text
Quality: 78 · Top 22% on the Epoch Capabilities Index
Context window: 1,000,000 tokens
Max output: 30,000 tokens
Input price: $1.25 / 1M tokens
Output price: $2.50 / 1M tokens
Cache read: $0.20 / 1M tokens
Cache write: —
Released: Apr 17, 2026
Knowledge cutoff: —
Takes in: Text, Image, PDF
Puts out: Text
Reasoning: Yes
Tool calling: Yes
Structured output: Yes
File attachments: Yes
Access: Paid
License: Proprietary
Rarity: Uncommon
Set number: 872/1040

Open xAI docs Quality 78 Where to run it 31 Evolution 2/5 Meet its creature Battle Gemini 3.5 Flash Lite

Weights aren’t public. Use is governed by xAI’s terms. Specs from models.dev, last changed Oct 18, 2026. Official source: docs.x.ai.

How good is it?

Public leaderboard scores for Grok 4.3, refreshed daily from Epoch AI and LMArena.

Top 22% of the 277 models on the Epoch Capabilities Index: #63.

Quality is the share of a leaderboard’s models this one beats, from 0 to 100. Chat models are rated on Epoch AI’s Capabilities Index when it lists them, otherwise on LMArena; image and video models on LMArena’s image and video arenas.

Leaderboards

Epoch Capabilities Index#63 of 277
One number fitted from dozens of hard benchmarks, from science questions to agentic coding.149.0 index
Listed as Grok 4.3 Beta
LMArena Text#158 of 416
People compare two anonymous answers and vote for the better one.1,397 rating
LMArena Text · Coding#154 of 411
The text arena’s coding prompts only.1,415 rating
LMArena Text · Math#178 of 400
The text arena’s math prompts only.1,387 rating
LMArena Text · Creative writing#133 of 414
The text arena’s creative writing prompts only.1,380 rating
LMArena WebDev#111 of 144
Each model builds a web app from the same prompt; people pick the better one.1,358 rating
LMArena Vision#78 of 165
Questions about images, voted by people.1,229 rating

Benchmarks Epoch AI runs

Scores from Epoch AI and LMArena, licensed CC BY 4.0. Boards list models under their own names, so a close match is shown with the name it was scored under. Credits

Where to run it

31 providers sell Grok 4.3 through an API. Prices are per million tokens, cheapest first.

Cheapest302.AI$1.25 in · $2.50 out
From the labxAI$1.25 in · $2.50 out

API providers

Provider	Input	Output	Context
302.AICheapest paid`grok-4.3`	$1.25	$2.50	1M
Abacus`grok-4.3`	$1.25	$2.50	1M
AIHubMix`grok-4.3`	$1.25	$2.50	1M
Amazon Bedrock`xai.grok-4.3`	$1.25	$2.50	1M
Auriko`grok-4.3`	$1.25	$2.50	1M
Cloudflare AI Gateway`xai/grok-4.3`	$1.25	$2.50	1M
CrossModel`x-ai/grok-4.3`	$1.25	$2.50	1M
DaoXE`grok-4.3`	$1.25	$2.50	1M
DevPass (LLM Gateway)`grok-4-3`	$1.25	$2.50	1M
Eden AI`xai/grok-4.3`	$1.25	$2.50	1M

Show 21 more providers

Provider	Input	Output	Context
FastRouter`x-ai/grok-4.3`	$1.25	$2.50	1M
FrogBot`grok-4-3`	$1.25	$2.50	1M
Impossibl`xai/grok-4.3`	$1.25	$2.50	1M
Kilo Gateway`x-ai/grok-4.3`	$1.25	$2.50	1M
LLM Gateway`xai/grok-4-3`	$1.25	$2.50	1M
Merge Gateway`xai/grok-4.3`	$1.25	$2.50	1M
NanoGPT`x-ai/grok-4.3`	$1.25	$2.50	1M
OCI Generative AI`xai.grok-4.3`	$1.25	$2.50	1M
Ofox`x-ai/grok-4.3`	$1.25	$2.50	1M
OpenRouter`x-ai/grok-4.3`	$1.25	$2.50	1M
Opper`grok-4.3`	$1.25	$2.50	1M
OrcaRouter`grok/grok-4.3`	$1.25	$2.50	1M
Requesty`grok-4.3`	$1.25	$2.50	1M
Standard Compute`x-ai/grok-4.3`	$1.25	$2.50	1M
Tempr Gateway`xai/grok-4.3`	$1.25	$2.50	1M
Vercel AI Gateway`spacexai/grok-4.3`	$1.25	$2.50	1M
Vertex`xai/grok-4.3`	$1.25	$2.50	200K
xAIOfficial`grok-4.3`	$1.25	$2.50	1M
ZenMux`x-ai/grok-4.3`	$1.25	$2.50	1M
Venice AI`grok-4-3`	$1.42	$2.83	1M
AnyAPI`xai/grok-4.3`	—	—	1M

From models.dev and Hugging Face, checked daily. Resellers’ listings can lag behind their price pages, so confirm with the provider before you commit.

Face off

Current text models from other labs at a similar output price.

Grok 4.3

Grok 4.3

How good is it?

Leaderboards

Benchmarks Epoch AI runs

Where to run it

API providers

Face off

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