Grok 4.3

Apr 2026
Grok 4.3
Compare in
on
$0.21per task?
$1.25 / $2.50per 1M in / outcache $0.20
188 tok/sfirst token in 18 s?
1Mcontext

Rankingat high effort?

Full ranking →
1GPT-6 Astra96.32Gemini 3.8 Flash95.33Grok 4.694.94Gemini 3.1 Pro Preview94.14Muse Spark 1.394.1
···
33GPT-5.290.334Grok 4.390.135Qwen3.7 Plus90

Strong at

S
Tool calling#9 of 242Knowledge#28 of 318Instructions#3 of 245
A
Reasoning#56 of 334Science#34 of 312
B
Long context#101 of 273Vision#34 of 124
C
Coding#75 of 132Agents & work tasks#89 of 175

History

8 versions
8890929496Jul 25Oct 25Jan 26Apr 26Jul 26Release dateGPQA Diamond44.20 · Mar4.20 · Apr4.34.54.6
8890929496Jul 25Jan 26Jul 26Release dateGPQA Diamond44.20 · Mar4.20 · Apr4.34.54.6

Benchmarks

in Chat & Knowledge
AA Intelligence Index 4.3.224.9#85
AA Omniscience Index18#28
AA Omniscience · Accuracy34.8#61
AA Omniscience · Hallucination Rate25.8#22
Humanity's Last Exam37.2#56
GPQA Diamond90.1#34
AA-LCR (long context) 1.173#101
IFBench (instructions)81.3#3
CritPt (physics)8#69
GDP.pdf · AA all-pass5.8#80
MLCR-AA10#41
GPQA Diamond · Epoch88.8#38
OTIS Mock AIME 2024 202593.3#38
FrontierMath Tiers 1–3 (v2)42.8#50
FrontierMath Tier 4 (v2)14.6#46
SimpleQA Verified v133.2#53
Chess Puzzles18#56

FAQ

How much does Grok 4.3 cost?›

$1.25 per 1M input tokens and $2.50 per 1M output tokens; cached input $0.20 per 1M. A typical benchmark task costs about $0.21 at high effort.

Is Grok 4.3 free to use?›

There is no free API; the cheapest paid price is $1.25 per 1M input tokens.

How good is Grok 4.3, and what is it best at?›

#56 of 334 in Chat & Knowledge, #75 of 132 in Coding, #106 of 133 in Agents & Tool Use, #52 of 195 in Writing & Language, #34 of 124 in Vision & Documents. Strongest at: Tool calling, Reasoning, Science, Knowledge, Instructions.

Is Grok 4.3 better than Grok 4.20?›

On GPQA Diamond, Grok 4.3 scores 90.1 vs 91.1 — lower.

How can I use Grok 4.3?›

Through the API of AWS Bedrock, xAI.

What is the context window of Grok 4.3?›

1M tokens, with up to 900K output tokens.

When was Grok 4.3 released? Is there a newer version?›

Released 2026-04-17. It has been superseded by Grok 4.6.

Is Grok 4.3 open source?›

No, Grok 4.3 is a closed model available through an API. The closest open-weights option here is Kimi K3.

Can Grok 4.3 read images?›

It accepts text and images, PDF files as input.

What is Grok 4.3?›

Grok 4.3 is a closed language model from xAI, released Apr 2026, the successor to Grok 4.20.

What are the best alternatives to Grok 4.3?›

GPT-5.6 Luna (cheaper), Qwen3.8 Flash (better), Kimi K3 (open weights).