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SpaceXAI Grok 4.3

  • xAI
  • Released April 30, 2026
  • No public weights listed
  • 1M context

As of October 20, 2026, SpaceXAI Grok 4.3 ranks #72 of 213 models overall with 24.9 on the Artificial Analysis Intelligence Index. Its strongest category is reasoning, where it ranks #31 of 203. SpaceXAI Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens. It was released on April 30, 2026.

Its output price ranks 212 of 349 priced models, counting from the cheapest.

  • Coding index 22.5 Thin, 1 benchmark
  • Cost per solved task $0.31 One SWE-bench Verified task, solved
  • Output, per million tokens $2.50 212 of 349 from the cheapest
  • Input, per million tokens $1.25 OpenRouter list price
  • Context window 1M Tokens per request

About and specs

Grok 4.3 is a reasoning model from SpaceXAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual...

API model id x-ai/grok-4.3
  • Tool callingListed
  • Structured outputsListed
  • JSON modeListed
  • Reasoning modeListed
  • Web searchNot listed
Takes in
Text, Images, Files
Gives back
Text
Context window
1M tokens
Max output
900K tokens
Knowledge cutoff
Not published
Cached input $/Mtok
$0.20
Cache write $/Mtok
No cache write price listed
Reasoning $/Mtok
Not priced apart
Web search, per request
$0.005
Tokenizer
Grok
Requests moderated
No
Withdrawn on
No date announced
Parameters
Not published
Downloads, all time
No public weights
Training compute
No estimate published
Output speed
Not measured
Time to first token
Not measured
Speed on OpenRouter
58 tokens/s via xAI, 30-minute median
First token on OpenRouter
1.3 s via xAI, 30-minute median

Benchmarks: 104 of 190 measured

The tick on a coding bar is the median of every model measured on it. Outside coding, the place is this model's rank on that board. A board that never ran the model says so.

Where it stands

Full leaderboard
#72of 213 overall 24.9AA Intelligence Index

Measured in 6 of 6 categories. A place counts only the models measured on that board.

Coding index

22.5
  • Aider polyglot Not measured
  • SWE-bench Verified Not measured
  • LiveBench coding Not measured
  • LMArena WebDev Elo, scaled from 1200 to 1900 1358 Elo 23 of 100

The index averages only the coding benchmarks that have a result; the others are skipped, never filled in. How it is weighted

Other public boards

All rankings

Coding17 of 34 boards

11 more coding boards

Not measured on SWE-bench Lite, SWE-bench (full test set), SWE-bench Multimodal, SWE-bench Multilingual, Terminal-Bench 4 (Vals AI), IOI (Vals AI), SWE-bench Multimodal (Vals AI), Vibe Code Bench 1-100 (Vals AI), CyberBench (Vals AI), LiveCodeBench (Artificial Analysis run), Terminal-Bench, DeepSWE, FrontierCode, FrontierSWE, GSO-Bench, MirrorCode, Cybench

Intelligence1 of 2 boards

Not measured on Epoch Capabilities Index

Agentic work16 of 39 boards

10 more agentic work boards

Not measured on Design Arena: spreadsheets, LiveBench research, LiveBench browser, LiveBench long agentic, SREBench (Vals AI), Harvey's Legal Agent Benchmark (Vals AI), BioMysteryBench (Vals AI), Terminal-Bench-Science (Vals AI), Vals Science Index, Time Horizon Index (Vals AI), CUA-bench (Vals AI), Robo-bench (Vals AI), APEX-Agents, METR time horizons, Remote Labor Index, GDPval, OSWorld 2.0, BALROG, DeepResearch Bench, PostTrainBench, TheAgentCompany, OSWorld, SpireClimb

Reasoning11 of 21 boards

5 more reasoning boards

Not measured on LiveBench reasoning, MysteryMechanism (Vals AI), ARC-AGI, ARC-AGI-2, Humanity's Last Exam, SimpleBench, Mystery game puzzles, EBR-bench, VPCT, BIG-Bench Hard

Math6 of 13 boards

Not measured on AIME, MATH 500 (Vals AI), MGSM (Vals AI), AA Math Index, AIME 2025 (Artificial Analysis run), MATH level 5, GSM8K

Knowledge12 of 17 boards

6 more knowledge boards

Not measured on MedQA (Vals AI), MMLU Pro (Artificial Analysis run), MMLU, GeoBench, AI2 Reasoning Challenge

Web design8 of 9 boards

2 more web design boards

Not measured on LiveBench design

General32 of 46 boards

26 more general boards

Not measured on Vals Index, LiveBench data analysis, Fiction.LiveBench, Creative writing (Lech Mazur), CL-bench, Surface Evolver Bench, Furniture assembly, ExploitBench, HellaSwag, WinoGrande, PIQA, CL-bench Life, LMArena Vision: captioning, LMArena Document

Image generation0 of 5 boards

Not measured on Design Arena: images, Design Arena: graphic design, Design Arena: logos, LMArena Text to Image, LMArena Image Edit

Public boards shown as published (Vals AI, Artificial Analysis, Design Arena) and kept out of the coding index. Each links to its source on the benchmark page.

All 190 benchmarks as a table
Benchmark results for SpaceXAI Grok 4.3
BenchmarkResultIndex weight
Aider polyglotCoding Not measured 35%
SWE-bench VerifiedCoding Not measured 30%
SWE-bench LiteCoding Not measured Not in index
SWE-bench (full test set)Coding Not measured Not in index
SWE-bench MultimodalCoding Not measured Not in index
SWE-bench MultilingualCoding Not measured Not in index
LiveBench codingCoding Not measured 20%
LMArena WebDevCoding 1358 15%
Vals IndexGeneral Not measured Not in index
GPQA DiamondReasoning 91.4% Not in index
AIMEMath Not measured Not in index
MMLU ProKnowledge 85.8% Not in index
AA Intelligence IndexIntelligence 24.9 Not in index
AA Coding IndexCoding 42.2 Not in index
AA Agentic IndexAgentic work 15.5 Not in index
Design Arena: websitesWeb design 1196 Not in index
Design Arena: UI componentsWeb design 1193 Not in index
Design Arena: game devWeb design 1174 Not in index
Design Arena: data vizWeb design 1179 Not in index
Design Arena: 3DWeb design 1125 Not in index
Design Arena: all code categoriesWeb design 1187 Not in index
Design Arena: SVGWeb design 1081 Not in index
Design Arena: ASCII artWeb design 1126 Not in index
Design Arena: agents building web appsAgentic work 1126 Not in index
Design Arena: agents building full-stack appsAgentic work 1006 Not in index
Design Arena: agents building mobile appsAgentic work 1057 Not in index
Design Arena: agents building Android appsAgentic work 977 Not in index
Design Arena: agents building Godot gamesAgentic work 914 Not in index
Design Arena: agents building gamesAgentic work 1007 Not in index
Design Arena: HTML slidesAgentic work 1008 Not in index
Design Arena: PowerPoint slidesAgentic work 1011 Not in index
Design Arena: spreadsheetsAgentic work Not measured Not in index
Design Arena: imagesImage generation Not measured Not in index
Design Arena: graphic designImage generation Not measured Not in index
Design Arena: logosImage generation Not measured Not in index
LiveBench reasoningReasoning Not measured Not in index
LiveBench data analysisGeneral Not measured Not in index
LiveBench researchAgentic work Not measured Not in index
LiveBench browserAgentic work Not measured Not in index
LiveBench long agenticAgentic work Not measured Not in index
LiveBench designWeb design Not measured Not in index
LiveCodeBench (Vals AI)Coding 84.5% Not in index
SWE-bench Verified (Vals AI)Coding 71.4% Not in index
Terminal-Bench 4 (Vals AI)Coding Not measured Not in index
Vibe Code Bench (Vals AI)Coding 19.4% Not in index
Code migration (Vals AI)Coding 6.8% Not in index
ProgramBench (Vals AI)Coding 0.0% Not in index
SREBench (Vals AI)Agentic work Not measured Not in index
IOI (Vals AI)Coding Not measured Not in index
Terminal-Bench 2.1 (Vals AI)Coding 42.0% Not in index
SWE-bench Multimodal (Vals AI)Coding Not measured Not in index
Vibe Code Bench 1-100 (Vals AI)Coding Not measured Not in index
SkillsBench (Vals AI)Coding 40.6% Not in index
CyberBench (Vals AI)Coding Not measured Not in index
Finance Agent (Vals AI)Agentic work 37.7% Not in index
Tax Agent Bench (Vals AI)Agentic work 6.2% Not in index
Legal Research Bench (Vals AI)Agentic work 15.4% Not in index
Harvey's Legal Agent Benchmark (Vals AI)Agentic work Not measured Not in index
Excel Modeling Benchmark (Vals AI)Agentic work 18.4% Not in index
BioMysteryBench (Vals AI)Agentic work Not measured Not in index
Terminal-Bench-Science (Vals AI)Agentic work Not measured Not in index
Vals Science IndexAgentic work Not measured Not in index
Time Horizon Index (Vals AI)Agentic work Not measured Not in index
CUA-bench (Vals AI)Agentic work Not measured Not in index
Robo-bench (Vals AI)Agentic work Not measured Not in index
Public Benefits Bench (Vals AI)General 51.7% Not in index
MysteryMechanism (Vals AI)Reasoning Not measured Not in index
MMMU Pro (Vals AI)Reasoning 83.1% Not in index
MATH 500 (Vals AI)Math Not measured Not in index
MGSM (Vals AI)Math Not measured Not in index
SAGE (Vals AI)General 19.7% Not in index
LegalBench (Vals AI)Knowledge 84.5% Not in index
CaseLaw (Vals AI)Knowledge 79.3% Not in index
CorpFin (Vals AI)Knowledge 68.5% Not in index
TaxEval (Vals AI)Knowledge 70.8% Not in index
MortgageTax (Vals AI)Knowledge 48.3% Not in index
MedQA (Vals AI)Knowledge Not measured Not in index
MedCode (Vals AI)Knowledge 38.1% Not in index
MedScribe (Vals AI)General 74.4% Not in index
Vals Multimodal IndexGeneral 43.3% Not in index
AA Math IndexMath Not measured Not in index
GPQA Diamond (Artificial Analysis run)Reasoning 90.1% Not in index
Humanity's Last Exam (Artificial Analysis run)Reasoning 37.2% Not in index
MMLU Pro (Artificial Analysis run)Knowledge Not measured Not in index
LiveCodeBench (Artificial Analysis run)Coding Not measured Not in index
SciCodeCoding 48.3% Not in index
Terminal-Bench Hard (Artificial Analysis run)Coding 37.9% Not in index
IFBenchGeneral 83.3% Not in index
Long context reasoning (AA-LCR)General 75.0% Not in index
τ²-Bench TelecomAgentic work 97.7% Not in index
AIME 2025 (Artificial Analysis run)Math Not measured Not in index
Terminal-BenchCoding Not measured Not in index
DeepSWECoding Not measured Not in index
FrontierCodeCoding Not measured Not in index
FrontierSWECoding Not measured Not in index
GSO-BenchCoding Not measured Not in index
WeirdMLCoding 49.9% Not in index
MirrorCodeCoding Not measured Not in index
APEX-AgentsAgentic work Not measured Not in index
METR time horizonsAgentic work Not measured Not in index
Remote Labor IndexAgentic work Not measured Not in index
GDPvalAgentic work Not measured Not in index
OSWorld 2.0Agentic work Not measured Not in index
BALROGAgentic work Not measured Not in index
DeepResearch BenchAgentic work Not measured Not in index
PostTrainBenchAgentic work Not measured Not in index
GPQA Diamond (Epoch AI run)Reasoning 88.8% Not in index
ARC-AGIReasoning Not measured Not in index
ARC-AGI-2Reasoning Not measured Not in index
Humanity's Last ExamReasoning Not measured Not in index
SimpleBenchReasoning Not measured Not in index
Chess puzzlesReasoning 18.0% Not in index
Mystery game puzzlesReasoning Not measured Not in index
EBR-benchReasoning Not measured Not in index
OTIS Mock AIMEMath 93.3% Not in index
FrontierMath, tiers 1 to 3Math 42.8% Not in index
FrontierMath, tier 4Math 14.6% Not in index
ProofBenchMath 11.0% Not in index
MATH level 5Math Not measured Not in index
GSM8KMath Not measured Not in index
SimpleQA VerifiedKnowledge 33.2% Not in index
MMLUKnowledge Not measured Not in index
GeoBenchKnowledge Not measured Not in index
DTBenchGeneral 90.7% Not in index
LMCAGeneral 38.3% Not in index
Fiction.LiveBenchGeneral Not measured Not in index
Creative writing (Lech Mazur)General Not measured Not in index
CL-benchGeneral Not measured Not in index
Surface Evolver BenchGeneral Not measured Not in index
Furniture assemblyGeneral Not measured Not in index
ExploitBenchGeneral Not measured Not in index
CybenchCoding Not measured Not in index
TheAgentCompanyAgentic work Not measured Not in index
OSWorldAgentic work Not measured Not in index
SpireClimbAgentic work Not measured Not in index
VPCTReasoning Not measured Not in index
BIG-Bench HardReasoning Not measured Not in index
AI2 Reasoning ChallengeKnowledge Not measured Not in index
HellaSwagGeneral Not measured Not in index
WinoGrandeGeneral Not measured Not in index
PIQAGeneral Not measured Not in index
CL-bench LifeGeneral Not measured Not in index
ALE-BenchCoding 944.2 Not in index
Vending-Bench 2Agentic work $35 Not in index
Epoch Capabilities IndexIntelligence Not measured Not in index
LMArena TextGeneral 1397 Not in index
LMArena Text: codingCoding 1415 Not in index
LMArena Text: hard promptsReasoning 1397 Not in index
LMArena Text: mathMath 1387 Not in index
LMArena Text: instruction followingGeneral 1366 Not in index
LMArena Text: creative writingGeneral 1380 Not in index
LMArena VisionGeneral 1229 Not in index
LMArena Text: EnglishGeneral 1404 Not in index
LMArena Text: non-EnglishGeneral 1385 Not in index
LMArena Text: ChineseGeneral 1421 Not in index
LMArena Text: GermanGeneral 1395 Not in index
LMArena Text: JapaneseGeneral 1379 Not in index
LMArena Text: KoreanGeneral 1355 Not in index
LMArena Text: FrenchGeneral 1412 Not in index
LMArena Text: SpanishGeneral 1399 Not in index
LMArena Text: RussianGeneral 1399 Not in index
LMArena Text: PolishGeneral 1398 Not in index
LMArena Text: multi-turnGeneral 1406 Not in index
LMArena Text: longer queriesGeneral 1393 Not in index
LMArena Text: expertReasoning 1385 Not in index
LMArena Text: hard prompts in EnglishReasoning 1402 Not in index
LMArena Text: software and ITCoding 1416 Not in index
LMArena Text: mathematical workMath 1397 Not in index
LMArena Text: scienceKnowledge 1399 Not in index
LMArena Text: medicine and healthcareKnowledge 1384 Not in index
LMArena Text: legal and governmentKnowledge 1386 Not in index
LMArena Text: business and financeKnowledge 1381 Not in index
LMArena Text: writing and languageGeneral 1385 Not in index
LMArena Text: entertainment and mediaGeneral 1371 Not in index
LMArena WebDev: ReactCoding 1353 Not in index
LMArena WebDev: HTMLCoding 1367 Not in index
LMArena WebDev: from an imageCoding 1375 Not in index
LMArena Vision: EnglishGeneral 1235 Not in index
LMArena Vision: ChineseGeneral 1257 Not in index
LMArena Vision: reading textGeneral 1235 Not in index
LMArena Vision: diagramsReasoning 1241 Not in index
LMArena Vision: homeworkReasoning 1241 Not in index
LMArena Vision: humorGeneral 1222 Not in index
LMArena Vision: captioningGeneral Not measured Not in index
LMArena Vision: recognizing thingsGeneral 1217 Not in index
LMArena Vision: creative writingGeneral 1237 Not in index
LMArena SearchAgentic work 1166 Not in index
LMArena DocumentGeneral Not measured Not in index
LMArena Text to ImageImage generation Not measured Not in index
LMArena Image EditImage generation Not measured Not in index

What it costs

A list price says what a token costs. The cost per solved task says what a working answer costs, which is the number that decides.

Output price against the market

Grok 4.3 pricing
$0.0112Dashed line: median $1.80, log scale$600.00
$2.50 per million output tokens is cheaper than 36% of the 344 paid models in the catalog.

Cost per solved task

How it is computed
$0.22one attempt, Vals AI 71.4%tasks solved $0.31per solved task

Nearly as good as Grok 4.3, for less

What the boards say about its runs

Beside a result, many boards publish what the run cost, how long it took, the tokens it spent or the votes behind a rating. Each figure as its board printed it, one board per row.

What each board publishes about the runs behind SpaceXAI: Grok 4.3's results
BoardResultWhat the run costAlso published
SWE-bench Verified (Vals AI) 71.4% $0.22 per test Duration, as printed 1m 58s
Vibe Code Bench (Vals AI) 19.4% $1.28 per test Duration, as printed 9m 49s
Code migration (Vals AI) 6.8% $0.42 per test Duration, as printed 3m 00s
ProgramBench (Vals AI) 0.0% $0.36 per test Duration, as printed 3m 56s
Terminal-Bench 2.1 (Vals AI) 42.0% $0.98 per test Duration, as printed 7m 51s
SkillsBench (Vals AI) 40.6% $0.42 per test Duration, as printed 4m 37s
Finance Agent (Vals AI) 37.7% $0.85 per test Duration, as printed 10m 15s
Tax Agent Bench (Vals AI) 6.2% $0.12 per test Duration, as printed 1m 38s
Legal Research Bench (Vals AI) 15.4% $0.20 per test Duration, as printed 1m 25s
Excel Modeling Benchmark (Vals AI) 18.4% $0.63 per test Duration, as printed 4m 32s
Public Benefits Bench (Vals AI) 51.7% $0.26 per test Nothing else
Vals Multimodal Index 43.3% $0.50 per test Duration, as printed 5m 39s
73 more boards
What each board publishes about the runs behind SpaceXAI: Grok 4.3's results, continued
WeirdML 49.9% $0.0903 per run Median lines of code 141
ProofBench 11.0% $0.2441 per test Time per proof 27m 23s
ALE-Bench 944.2 $0.0558 per problem Tokens per problem 24,066
LMArena WebDev 1358 Elo Not published Votes 14,954 · Interval (±) ±6.2
GPQA Diamond 91.4% Not published Latency, as printed 12m 20s
MMLU Pro 85.8% Not published Latency, as printed 10m 37s
Design Arena: websites 1196 Elo Not published Battles 21,528
Design Arena: UI components 1193 Elo Not published Battles 3,955
Design Arena: game dev 1174 Elo Not published Battles 7,327
Design Arena: data viz 1179 Elo Not published Battles 3,200
Design Arena: 3D 1125 Elo Not published Battles 11,695
Design Arena: all code categories 1187 Elo Not published Battles 41,076
Design Arena: SVG 1081 Elo Not published Battles 3,416
Design Arena: ASCII art 1126 Elo Not published Battles 600
Design Arena: agents building web apps 1126 Elo Not published Battles 6,416
Design Arena: agents building full-stack apps 1006 Elo Not published Battles 3,448
Design Arena: agents building mobile apps 1057 Elo Not published Battles 1,616
Design Arena: agents building Android apps 977 Elo Not published Battles 1,812
Design Arena: agents building Godot games 914 Elo Not published Battles 314
Design Arena: agents building games 1007 Elo Not published Battles 1,917
Design Arena: HTML slides 1008 Elo Not published Battles 1,937
Design Arena: PowerPoint slides 1011 Elo Not published Battles 896
LiveCodeBench (Vals AI) 84.5% Not published Latency, as printed 54m 09s
MMMU Pro (Vals AI) 83.1% Not published Latency, as printed 2m 31s
SAGE (Vals AI) 19.7% Not published Latency, as printed 1m 36s
LegalBench (Vals AI) 84.5% Not published Latency, as printed 5m 48s
CaseLaw (Vals AI) 79.3% Not published Latency, as printed 43 s
CorpFin (Vals AI) 68.5% Not published Latency, as printed 36 s
TaxEval (Vals AI) 70.8% Not published Latency, as printed 6m 32s
MortgageTax (Vals AI) 48.3% Not published Latency, as printed 7m 23s
MedCode (Vals AI) 38.1% Not published Latency, as printed 44 s
MedScribe (Vals AI) 74.4% Not published Latency, as printed 1m 40s
LMArena Text 1397 Elo Not published Votes 71,347 · Interval (±) ±3.6
LMArena Text: coding 1415 Elo Not published Votes 19,950 · Interval (±) ±5.6
LMArena Text: hard prompts 1397 Elo Not published Votes 47,680 · Interval (±) ±4.3
LMArena Text: math 1387 Elo Not published Votes 3,416 · Interval (±) ±10.7
LMArena Text: instruction following 1366 Elo Not published Votes 25,136 · Interval (±) ±5.2
LMArena Text: creative writing 1380 Elo Not published Votes 13,226 · Interval (±) ±6.5
LMArena Vision 1229 Elo Not published Votes 27,901 · Interval (±) ±5.8
LMArena Text: English 1404 Elo Not published Votes 32,785 · Interval (±) ±4.7
LMArena Text: non-English 1385 Elo Not published Votes 38,561 · Interval (±) ±4.5
LMArena Text: Chinese 1421 Elo Not published Votes 4,520 · Interval (±) ±9.5
LMArena Text: German 1395 Elo Not published Votes 1,043 · Interval (±) ±19.2
LMArena Text: Japanese 1379 Elo Not published Votes 854 · Interval (±) ±22.2
LMArena Text: Korean 1355 Elo Not published Votes 1,130 · Interval (±) ±19.1
LMArena Text: French 1412 Elo Not published Votes 2,581 · Interval (±) ±13.7
LMArena Text: Spanish 1399 Elo Not published Votes 2,009 · Interval (±) ±14.5
LMArena Text: Russian 1399 Elo Not published Votes 7,507 · Interval (±) ±7.6
LMArena Text: Polish 1398 Elo Not published Votes 1,201 · Interval (±) ±17.5
LMArena Text: multi-turn 1406 Elo Not published Votes 12,856 · Interval (±) ±6.5
LMArena Text: longer queries 1393 Elo Not published Votes 33,219 · Interval (±) ±4.9
LMArena Text: expert 1385 Elo Not published Votes 7,539 · Interval (±) ±7.8
LMArena Text: hard prompts in English 1402 Elo Not published Votes 22,457 · Interval (±) ±5.4
LMArena Text: software and IT 1416 Elo Not published Votes 28,538 · Interval (±) ±5.0
LMArena Text: mathematical work 1397 Elo Not published Votes 3,938 · Interval (±) ±10.2
LMArena Text: science 1399 Elo Not published Votes 11,796 · Interval (±) ±6.5
LMArena Text: medicine and healthcare 1384 Elo Not published Votes 5,323 · Interval (±) ±9.1
LMArena Text: legal and government 1386 Elo Not published Votes 5,796 · Interval (±) ±8.7
LMArena Text: business and finance 1381 Elo Not published Votes 14,233 · Interval (±) ±6.2
LMArena Text: writing and language 1385 Elo Not published Votes 18,665 · Interval (±) ±5.7
LMArena Text: entertainment and media 1371 Elo Not published Votes 17,244 · Interval (±) ±5.9
LMArena WebDev: React 1353 Elo Not published Votes 11,475 · Interval (±) ±6.9
LMArena WebDev: HTML 1367 Elo Not published Votes 1,769 · Interval (±) ±15.4
LMArena WebDev: from an image 1375 Elo Not published Votes 5,868 · Interval (±) ±9.7
LMArena Vision: English 1235 Elo Not published Votes 11,160 · Interval (±) ±8.1
LMArena Vision: Chinese 1257 Elo Not published Votes 1,650 · Interval (±) ±17.2
LMArena Vision: reading text 1235 Elo Not published Votes 19,659 · Interval (±) ±5.8
LMArena Vision: diagrams 1241 Elo Not published Votes 7,408 · Interval (±) ±8.3
LMArena Vision: homework 1241 Elo Not published Votes 3,560 · Interval (±) ±10.6
LMArena Vision: humor 1222 Elo Not published Votes 1,069 · Interval (±) ±18.9
LMArena Vision: recognizing things 1217 Elo Not published Votes 142 · Interval (±) ±44.7
LMArena Vision: creative writing 1237 Elo Not published Votes 2,011 · Interval (±) ±14.1
LMArena Search 1166 Elo Not published Votes 128,393 · Interval (±) ±4.7

On these lists

Compare with models of a similar score

All 135 comparisons for Grok 4.3