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Claude Opus 4.6 vs Grok 4.3

Claude Opus 4.6 leads Grok 4.3 on coding, 57.2 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; 86 benchmarks have a result for both.

Replace Claude Opus 4.6 Replace Grok 4.3
Claude Opus 4.6Anthropic
Coding
57.2
Overall
66.0
Output $/M
$25.00
80
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
6
vs boards won of 86 shared

Claude Opus 4.6 or Grok 4.3: which to pick

Pick Claude Opus 4.6 for coding: it scores 57.2 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 $1.56).

Model AClaude Opus 4.6Anthropic57.2/1004 independent benchmarks$1.56 per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
86
Claude Opus 4.6 only
24
Grok 4.3 only
18
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 4.6 57.2 from 4 benchmarks, Grok 4.3 37.4 from 3 benchmarks.
Widest category
Agentic work, 23.7 points apart on average over 7 shared benchmarks.
Widest single gap
Vending-Bench 2: Claude Opus 4.6 $8,018 against Grok 4.3 $35, 49.9 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against Grok 4.3 $2.50 per million output tokens, 10.0x apart.
Context window
Both take 1M tokens.

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 4.6BarsGrok 4.3Ties
Coding110
Intelligence10
Agentic work61
Reasoning92
Math60
Knowledge102
Web design80
General291
All shared boards806
CodingLike-for-likeSix of these boards feed the Vibe Coding Index110
Coding benchmarks for Claude Opus 4.6 and Grok 4.3
BenchmarkClaude Opus 4.6Grok 4.3Leader
SWE-bench Verified75.6%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev15471358Claude Opus 4.6
AA Coding IndexNot measured42.2Only Grok 4.3 measured
LiveCodeBench (Vals AI)84.7%84.5%Claude Opus 4.6
SWE-bench Verified (Vals AI)78.2%71.4%Claude Opus 4.6
Vibe Code Bench (Vals AI)57.6%19.4%Claude Opus 4.6
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
SciCodeNot measured48.3%Only Grok 4.3 measured
Terminal-Bench Hard (Artificial Analysis run)48.5%37.9%Claude Opus 4.6
Terminal-Bench79.8%Not measuredOnly Claude Opus 4.6 measured
FrontierCode26.6%Not measuredOnly Claude Opus 4.6 measured
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%49.9%Claude Opus 4.6
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
ALE-BenchNot measured944.2Only Grok 4.3 measured
LMArena Text: coding15341415Claude Opus 4.6
LMArena Text: software and IT15271416Claude Opus 4.6
LMArena WebDev: React15391353Claude Opus 4.6
LMArena WebDev: HTML15591367Claude Opus 4.6
LMArena WebDev: from an image15431375Claude Opus 4.6
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Claude Opus 4.6 and Grok 4.3
BenchmarkClaude Opus 4.6Grok 4.3Leader
AA Intelligence Index31.924.9Claude Opus 4.6
Epoch Capabilities Index155.7Not measuredOnly Claude Opus 4.6 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index61
Agentic work benchmarks for Claude Opus 4.6 and Grok 4.3
BenchmarkClaude Opus 4.6Grok 4.3Leader
AA Agentic IndexNot measured15.5Only Grok 4.3 measured
Design Arena: agents building web apps12061126Claude Opus 4.6
Design Arena: agents building full-stack apps12201006Claude Opus 4.6
Design Arena: agents building mobile apps12071059Claude Opus 4.6
Design Arena: agents building Android apps1196961Claude Opus 4.6
Design Arena: agents building Godot gamesNot measured914Only Grok 4.3 measured
Design Arena: agents building games12121007Claude Opus 4.6
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 Telecom92.1%97.7%Grok 4.3
APEX-Agents46.3%Not measuredOnly Claude Opus 4.6 measured
METR time horizons78.9%Not measuredOnly Claude Opus 4.6 measured
Remote Labor Index4.2%Not measuredOnly Claude Opus 4.6 measured
DeepResearch Bench55.3%Not measuredOnly Claude Opus 4.6 measured
Vending-Bench 2$8,018$35Claude Opus 4.6
LMArena SearchNot measured1166Only Grok 4.3 measured
Neither model has a result on the other 21 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index92
Reasoning benchmarks for Claude Opus 4.6 and Grok 4.3
BenchmarkClaude Opus 4.6Grok 4.3Leader
GPQA Diamond89.7%91.4%Grok 4.3
MMMU Pro (Vals AI)83.9%83.1%Claude Opus 4.6
GPQA Diamond (Artificial Analysis run)89.6%90.1%Grok 4.3
Humanity's Last Exam (Artificial Analysis run)39.9%37.2%Claude Opus 4.6
GPQA Diamond (Epoch AI run)90.5%88.8%Claude Opus 4.6
ARC-AGI94.0%Not measuredOnly Claude Opus 4.6 measured
ARC-AGI-269.2%Not measuredOnly Claude Opus 4.6 measured
SimpleBench67.6%Not measuredOnly Claude Opus 4.6 measured
Chess puzzles21.0%18.0%Claude Opus 4.6
Mystery game puzzles25.0%Not measuredOnly Claude Opus 4.6 measured
EBR-bench12.7%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts15251396Claude Opus 4.6
LMArena Text: expert15441384Claude Opus 4.6
LMArena Text: hard prompts in English15301402Claude Opus 4.6
LMArena Vision: diagrams13401241Claude Opus 4.6
LMArena Vision: homework13371241Claude Opus 4.6
Kagi LLM Benchmark83.6%Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 4.6 and Grok 4.3
BenchmarkClaude Opus 4.6Grok 4.3Leader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
OTIS Mock AIME94.4%93.3%Claude Opus 4.6
FrontierMath, tiers 1 to 366.0%42.8%Claude Opus 4.6
FrontierMath, tier 426.8%14.6%Claude Opus 4.6
ProofBench50.0%11.0%Claude Opus 4.6
LMArena Text: math15181387Claude Opus 4.6
LMArena Text: mathematical work15251396Claude Opus 4.6
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index102
Knowledge benchmarks for Claude Opus 4.6 and Grok 4.3
BenchmarkClaude Opus 4.6Grok 4.3Leader
MMLU Pro89.1%85.8%Claude Opus 4.6
LegalBench (Vals AI)85.3%84.5%Claude Opus 4.6
CaseLaw (Vals AI)62.1%79.3%Grok 4.3
CorpFin (Vals AI)67.0%68.5%Grok 4.3
TaxEval (Vals AI)76.0%70.8%Claude Opus 4.6
MortgageTax (Vals AI)68.5%48.3%Claude Opus 4.6
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%38.1%Claude Opus 4.6
SimpleQA Verified47.0%33.2%Claude Opus 4.6
LMArena Text: science15191399Claude Opus 4.6
LMArena Text: medicine and healthcare15041384Claude Opus 4.6
LMArena Text: legal and government15121386Claude Opus 4.6
LMArena Text: business and finance14971381Claude Opus 4.6
FACTS Benchmark Suite41.5%Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 4.6 and Grok 4.3
BenchmarkClaude Opus 4.6Grok 4.3Leader
Design Arena: websites12911196Claude Opus 4.6
Design Arena: UI components12841192Claude Opus 4.6
Design Arena: game dev12781174Claude Opus 4.6
Design Arena: data viz12791179Claude Opus 4.6
Design Arena: 3D12741125Claude Opus 4.6
Design Arena: all code categories12891187Claude Opus 4.6
Design Arena: SVG12281081Claude Opus 4.6
Design Arena: ASCII art12551125Claude Opus 4.6
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index291
General benchmarks for Claude Opus 4.6 and Grok 4.3
BenchmarkClaude Opus 4.6Grok 4.3Leader
Public Benefits Bench (Vals AI)Not measured51.7%Only Grok 4.3 measured
SAGE (Vals AI)51.6%19.7%Claude Opus 4.6
MedScribe (Vals AI)86.7%74.4%Claude Opus 4.6
Vals Multimodal IndexNot measured43.3%Only Grok 4.3 measured
IFBench53.1%83.3%Grok 4.3
Long context reasoning (AA-LCR)78.0%75.0%Claude Opus 4.6
DTBench91.2%90.7%Claude Opus 4.6
LMCA55.8%38.3%Claude Opus 4.6
CL-bench20.7%Not measuredOnly Claude Opus 4.6 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.6 measured
CL-bench Life17.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text15011397Claude Opus 4.6
LMArena Text: instruction following15211366Claude Opus 4.6
LMArena Text: creative writing15051380Claude Opus 4.6
LMArena Vision13161229Claude Opus 4.6
LMArena Text: English15111404Claude Opus 4.6
LMArena Text: non-English14881385Claude Opus 4.6
LMArena Text: Chinese15511422Claude Opus 4.6
LMArena Text: German15001395Claude Opus 4.6
LMArena Text: Japanese14881379Claude Opus 4.6
LMArena Text: Korean14641354Claude Opus 4.6
LMArena Text: French15121411Claude Opus 4.6
LMArena Text: Spanish15101399Claude Opus 4.6
LMArena Text: Russian14971399Claude Opus 4.6
LMArena Text: Polish14991398Claude Opus 4.6
LMArena Text: multi-turn15111406Claude Opus 4.6
LMArena Text: longer queries15181393Claude Opus 4.6
LMArena Text: writing and language15021385Claude Opus 4.6
LMArena Text: entertainment and media14921370Claude Opus 4.6
LMArena Vision: English13241235Claude Opus 4.6
LMArena Vision: Chinese13701257Claude Opus 4.6
LMArena Vision: reading text13261235Claude Opus 4.6
LMArena Vision: humor13141222Claude Opus 4.6
LMArena Vision: recognizing things12741217Claude Opus 4.6
LMArena Vision: creative writing13311237Claude Opus 4.6
LMArena Document1507Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.6 and Grok 4.3
BenchmarkClaude Opus 4.6Grok 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 4.6$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 4.6$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 4.6$1.25Fits in one request
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 4.6 and Grok 4.3
SpecificationAnthropic Claude Opus 4.6SpaceXAI Grok 4.3
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 4, 2026April 30, 2026
Context window1M1M
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$2.50
Coding index57.237.4
Independent measurements behind it43
Cost per solved task$1.56$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than Grok 4.3 for coding?

Pick Claude Opus 4.6 for coding: it scores 57.2 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 $1.56).

Which is cheaper, Claude Opus 4.6 or Grok 4.3?

Claude Opus 4.6 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 4.6 costs $1.56 and Grok 4.3 $0.31.

Which has the bigger context window, Claude Opus 4.6 or Grok 4.3?

Neither: both take 1M tokens.

How many benchmarks is the Claude Opus 4.6 vs Grok 4.3 comparison based on?

86 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.6's coding index rests on 4 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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