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Claude Opus 4.5 vs Grok 4.3

Claude Opus 4.5 leads Grok 4.3 on coding, 44.0 to 37.4 on the Vibe Coding Index, and Grok 4.3 costs 10.0x less per output token ($2.50 vs $25.00 per million). Updated October 21, 2026; 75 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace Grok 4.3
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
60
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
15
vs boards won of 75 shared

Claude Opus 4.5 or Grok 4.3: which to pick

Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for output tokens 10.0x cheaper ($2.50 vs $25.00 per million) and a lower cost per solved task ($0.31 against $1.37).

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
75
Claude Opus 4.5 only
33
Grok 4.3 only
29
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Opus 4.5 44.0 from 3 benchmarks, Grok 4.3 37.4 from 3 benchmarks.
Widest category
Agentic work, 17.5 points apart on average over 6 shared benchmarks.
Widest single gap
SAGE (Vals AI): Claude Opus 4.5 52.1% against Grok 4.3 19.7%, 32.4 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against Grok 4.3 $2.50 per million output tokens, 10.0x apart.
Context window
Claude Opus 4.5 takes 200K tokens, Grok 4.3 1M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Opus 4.5BarsGrok 4.3Ties
Coding91
Intelligence10
Agentic work51
Reasoning36
Math33
Knowledge102
Web design80
General212
All shared boards6015
CodingLike-for-likeSix of these boards feed the Vibe Coding Index91
Coding benchmarks for Claude Opus 4.5 and Grok 4.3
BenchmarkClaude Opus 4.5Grok 4.3Leader
SWE-bench Verified79.2%Not measuredOnly Claude Opus 4.5 measured
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Multilingual70.7%Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev14941358Claude Opus 4.5
AA Coding IndexNot measured42.2Only Grok 4.3 measured
LiveCodeBench (Vals AI)83.7%84.5%Grok 4.3
SWE-bench Verified (Vals AI)76.4%71.4%Claude Opus 4.5
Vibe Code Bench (Vals AI)20.6%19.4%Claude Opus 4.5
Code migration (Vals AI)Not measured6.8%Only Grok 4.3 measured
ProgramBench (Vals AI)Not measured0.0%Only Grok 4.3 measured
Terminal-Bench 2.1 (Vals AI)Not measured42.0%Only Grok 4.3 measured
SkillsBench (Vals AI)Not measured40.6%Only Grok 4.3 measured
LiveCodeBench (Artificial Analysis run)87.1%Not measuredOnly Claude Opus 4.5 measured
SciCodeNot measured48.3%Only Grok 4.3 measured
Terminal-Bench Hard (Artificial Analysis run)47.0%37.9%Claude Opus 4.5
Terminal-Bench63.1%Not measuredOnly Claude Opus 4.5 measured
GSO-Bench26.5%Not measuredOnly Claude Opus 4.5 measured
WeirdML63.7%49.9%Claude Opus 4.5
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
ALE-BenchNot measured944.2Only Grok 4.3 measured
LMArena Text: coding15031415Claude Opus 4.5
LMArena Text: software and IT14831416Claude Opus 4.5
LMArena WebDev: React14781353Claude Opus 4.5
LMArena WebDev: HTML15101367Claude Opus 4.5
LMArena WebDev: from an imageNot measured1375Only Grok 4.3 measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Claude Opus 4.5 and Grok 4.3
BenchmarkClaude Opus 4.5Grok 4.3Leader
AA Intelligence Index29.124.9Claude Opus 4.5
Epoch Capabilities Index150.1Not measuredOnly Claude Opus 4.5 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index51
Agentic work benchmarks for Claude Opus 4.5 and Grok 4.3
BenchmarkClaude Opus 4.5Grok 4.3Leader
AA Agentic IndexNot measured15.5Only Grok 4.3 measured
Design Arena: agents building web apps11591126Claude Opus 4.5
Design Arena: agents building full-stack apps11561006Claude Opus 4.5
Design Arena: agents building mobile apps11891059Claude Opus 4.5
Design Arena: agents building Android apps1175961Claude Opus 4.5
Design Arena: agents building Godot gamesNot measured914Only Grok 4.3 measured
Design Arena: agents building gamesNot measured1007Only Grok 4.3 measured
Design Arena: HTML slidesNot measured1008Only Grok 4.3 measured
Design Arena: PowerPoint slidesNot measured1013Only Grok 4.3 measured
Finance Agent (Vals AI)Not measured37.7%Only Grok 4.3 measured
Tax Agent Bench (Vals AI)Not measured6.2%Only Grok 4.3 measured
Legal Research Bench (Vals AI)Not measured15.4%Only Grok 4.3 measured
Excel Modeling Benchmark (Vals AI)Not measured18.4%Only Grok 4.3 measured
τ²-Bench Telecom89.5%97.7%Grok 4.3
METR time horizons75.0%Not measuredOnly Claude Opus 4.5 measured
Remote Labor Index3.8%Not measuredOnly Claude Opus 4.5 measured
GDPval45.5%Not measuredOnly Claude Opus 4.5 measured
BALROG43.5%Not measuredOnly Claude Opus 4.5 measured
DeepResearch Bench54.8%Not measuredOnly Claude Opus 4.5 measured
OSWorld66.3%Not measuredOnly Claude Opus 4.5 measured
Vending-Bench 2$4,967$35Claude Opus 4.5
LMArena SearchNot measured1166Only Grok 4.3 measured
Berkeley Function Calling Leaderboard (BFCL)77.5%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index36
Reasoning benchmarks for Claude Opus 4.5 and Grok 4.3
BenchmarkClaude Opus 4.5Grok 4.3Leader
GPQA Diamond85.9%91.4%Grok 4.3
MMMU Pro (Vals AI)83.0%83.1%Grok 4.3
GPQA Diamond (Artificial Analysis run)86.6%90.1%Grok 4.3
Humanity's Last Exam (Artificial Analysis run)30.1%37.2%Grok 4.3
GPQA Diamond (Epoch AI run)86.0%88.8%Grok 4.3
ARC-AGI80.0%Not measuredOnly Claude Opus 4.5 measured
ARC-AGI-237.6%Not measuredOnly Claude Opus 4.5 measured
SimpleBench62.0%Not measuredOnly Claude Opus 4.5 measured
Chess puzzles14.0%18.0%Grok 4.3
Mystery game puzzles22.0%Not measuredOnly Claude Opus 4.5 measured
EBR-bench14.3%Not measuredOnly Claude Opus 4.5 measured
VPCT40.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: hard prompts14761396Claude Opus 4.5
LMArena Text: expert14871384Claude Opus 4.5
LMArena Text: hard prompts in English14821402Claude Opus 4.5
LMArena Vision: diagramsNot measured1241Only Grok 4.3 measured
LMArena Vision: homeworkNot measured1241Only Grok 4.3 measured
Kagi LLM Benchmark80.2%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index33
Math benchmarks for Claude Opus 4.5 and Grok 4.3
BenchmarkClaude Opus 4.5Grok 4.3Leader
AIME95.4%Not measuredOnly Claude Opus 4.5 measured
MGSM (Vals AI)95.2%Not measuredOnly Claude Opus 4.5 measured
AA Math Index91.3Not measuredOnly Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)91.3%Not measuredOnly Claude Opus 4.5 measured
OTIS Mock AIME86.1%93.3%Grok 4.3
FrontierMath, tiers 1 to 334.4%42.8%Grok 4.3
FrontierMath, tier 44.9%14.6%Grok 4.3
ProofBench36.0%11.0%Claude Opus 4.5
LMArena Text: math14631387Claude Opus 4.5
LMArena Text: mathematical work14681396Claude Opus 4.5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index102
Knowledge benchmarks for Claude Opus 4.5 and Grok 4.3
BenchmarkClaude Opus 4.5Grok 4.3Leader
MMLU Pro87.3%85.8%Claude Opus 4.5
LegalBench (Vals AI)84.6%84.5%Claude Opus 4.5
CaseLaw (Vals AI)62.6%79.3%Grok 4.3
CorpFin (Vals AI)65.1%68.5%Grok 4.3
TaxEval (Vals AI)74.9%70.8%Claude Opus 4.5
MortgageTax (Vals AI)68.7%48.3%Claude Opus 4.5
MedQA (Vals AI)95.9%Not measuredOnly Claude Opus 4.5 measured
MedCode (Vals AI)49.2%38.1%Claude Opus 4.5
MMLU Pro (Artificial Analysis run)89.5%Not measuredOnly Claude Opus 4.5 measured
SimpleQA Verified45.7%33.2%Claude Opus 4.5
GeoBench75.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: science14541399Claude Opus 4.5
LMArena Text: medicine and healthcare14441384Claude Opus 4.5
LMArena Text: legal and government14591386Claude Opus 4.5
LMArena Text: business and finance14481381Claude Opus 4.5
FACTS Benchmark Suite43.9%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 4.5 and Grok 4.3
BenchmarkClaude Opus 4.5Grok 4.3Leader
Design Arena: websites12471196Claude Opus 4.5
Design Arena: UI components12381192Claude Opus 4.5
Design Arena: game dev12291174Claude Opus 4.5
Design Arena: data viz12431179Claude Opus 4.5
Design Arena: 3D12141125Claude Opus 4.5
Design Arena: all code categories12421187Claude Opus 4.5
Design Arena: SVG11811081Claude Opus 4.5
Design Arena: ASCII art11901125Claude Opus 4.5
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index212
General benchmarks for Claude Opus 4.5 and Grok 4.3
BenchmarkClaude Opus 4.5Grok 4.3Leader
Public Benefits Bench (Vals AI)Not measured51.7%Only Grok 4.3 measured
SAGE (Vals AI)52.1%19.7%Claude Opus 4.5
MedScribe (Vals AI)85.3%74.4%Claude Opus 4.5
Vals Multimodal IndexNot measured43.3%Only Grok 4.3 measured
IFBench58.0%83.3%Grok 4.3
Long context reasoning (AA-LCR)77.3%75.0%Claude Opus 4.5
DTBench89.9%90.7%Grok 4.3
LMCA44.5%38.3%Claude Opus 4.5
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.5 measured
LMArena Text14511397Claude Opus 4.5
LMArena Text: instruction following14781366Claude Opus 4.5
LMArena Text: creative writing14451380Claude Opus 4.5
LMArena VisionNot measured1229Only Grok 4.3 measured
LMArena Text: English14611404Claude Opus 4.5
LMArena Text: non-English14381385Claude Opus 4.5
LMArena Text: Chinese14701422Claude Opus 4.5
LMArena Text: German14491395Claude Opus 4.5
LMArena Text: Japanese14171379Claude Opus 4.5
LMArena Text: Korean14241354Claude Opus 4.5
LMArena Text: French14711411Claude Opus 4.5
LMArena Text: Spanish14571399Claude Opus 4.5
LMArena Text: Russian14471399Claude Opus 4.5
LMArena Text: Polish14391398Claude Opus 4.5
LMArena Text: multi-turn14661406Claude Opus 4.5
LMArena Text: longer queries14791393Claude Opus 4.5
LMArena Text: writing and language14521385Claude Opus 4.5
LMArena Text: entertainment and media14341370Claude Opus 4.5
LMArena Vision: EnglishNot measured1235Only Grok 4.3 measured
LMArena Vision: ChineseNot measured1257Only Grok 4.3 measured
LMArena Vision: reading textNot measured1235Only Grok 4.3 measured
LMArena Vision: humorNot measured1222Only Grok 4.3 measured
LMArena Vision: recognizing thingsNot measured1217Only Grok 4.3 measured
LMArena Vision: creative writingNot measured1237Only Grok 4.3 measured
LMArena Document1462Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.5 and Grok 4.3
BenchmarkClaude Opus 4.5Grok 4.3Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Opus 4.5$0.018Fits in one request
Grok 4.3$0.0025Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request
Grok 4.3$0.070Fits in one request

Grok 4.3 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds the context window
Grok 4.3$0.275Fits in one request

Grok 4.3 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Opus 4.5 and Grok 4.3
SpecificationAnthropic Claude Opus 4.5SpaceXAI Grok 4.3
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 24, 2025April 30, 2026
Context window200K1M
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$2.50
Coding index44.037.4
Independent measurements behind it33
Cost per solved task$1.37$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than Grok 4.3 for coding?

Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for output tokens 10.0x cheaper ($2.50 vs $25.00 per million) and a lower cost per solved task ($0.31 against $1.37).

Which is cheaper, Claude Opus 4.5 or Grok 4.3?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, Claude Opus 4.5 costs $1.37 and Grok 4.3 $0.31.

Which has the bigger context window, Claude Opus 4.5 or Grok 4.3?

Grok 4.3, with 1M tokens against 200K.

How many benchmarks is the Claude Opus 4.5 vs Grok 4.3 comparison based on?

75 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.5's coding index rests on 3 independent benchmarks and Grok 4.3's on 3. Where only one model has a result, the page says so instead of naming a winner.

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