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Claude Sonnet 4.6 vs Grok 4.20

Claude Sonnet 4.6 leads Grok 4.20 on coding, 57.3 to 33.3 on the Vibe Coding Index, and Grok 4.20 costs 6.0x less per output token ($2.50 vs $15.00 per million). Updated October 21, 2026; 49 benchmarks have a result for both.

Replace Claude Sonnet 4.6 Replace Grok 4.20
Claude Sonnet 4.6Anthropic
Coding
57.3
Overall
60.3
Output $/M
$15.00
37
Grok 4.20xAI
Coding
33.3
Overall
41.0
Output $/M
$2.50
12
vs boards won of 49 shared

Claude Sonnet 4.6 or Grok 4.20: which to pick

Pick Claude Sonnet 4.6 for coding: it scores 57.3 on the Vibe Coding Index against 33.3 for Grok 4.20.

Pick Grok 4.20 for output tokens 6.0x cheaper ($2.50 vs $15.00 per million) and a lower cost per solved task ($0.72 against $1.68).

Model AClaude Sonnet 4.6Anthropic57.3/1005 independent benchmarks$1.68 per solved taskModel BGrok 4.20xAI33.3/1002 independent benchmarks$0.72 per solved task
Shared results
49
Claude Sonnet 4.6 only
69
Grok 4.20 only
6
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 Sonnet 4.6 57.3 from 5 benchmarks, Grok 4.20 33.3 from 2 benchmarks.
Widest category
Agentic work, 20.0 points apart on average over 11 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Claude Sonnet 4.6 55.8% against Grok 4.20 4.1%, 51.7 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.6 $15.00 against Grok 4.20 $2.50 per million output tokens, 6.0x apart.
Context window
Claude Sonnet 4.6 takes 1M tokens, Grok 4.20 2M.

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 Sonnet 4.6BarsGrok 4.20Ties
Coding62
Intelligence20
Agentic work101
Reasoning15
Math01
Knowledge61
Web design80
General42
All shared boards3712
CodingLike-for-likeSix of these boards feed the Vibe Coding Index62
Coding benchmarks for Claude Sonnet 4.6 and Grok 4.20
BenchmarkClaude Sonnet 4.6Grok 4.20Leader
LiveBench coding66.6%Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev1523Not measuredOnly Claude Sonnet 4.6 measured
AA Coding Index63.0Not measuredOnly Claude Sonnet 4.6 measured
LiveCodeBench (Vals AI)82.1%84.3%Grok 4.20
SWE-bench Verified (Vals AI)77.4%72.2%Claude Sonnet 4.6
Vibe Code Bench (Vals AI)55.8%4.1%Claude Sonnet 4.6
Code migration (Vals AI)39.9%0.3%Claude Sonnet 4.6
ProgramBench (Vals AI)0.5%Not measuredOnly Claude Sonnet 4.6 measured
Terminal-Bench 2.1 (Vals AI)57.3%44.2%Claude Sonnet 4.6
SkillsBench (Vals AI)49.0%Not measuredOnly Claude Sonnet 4.6 measured
SciCode50.1%Not measuredOnly Claude Sonnet 4.6 measured
Terminal-Bench Hard (Artificial Analysis run)53.0%37.9%Claude Sonnet 4.6
Terminal-Bench53.4%57.3%Grok 4.20
FrontierCode24.3%Not measuredOnly Claude Sonnet 4.6 measured
WeirdML66.1%52.3%Claude Sonnet 4.6
LMArena Text: coding1503Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: software and IT1491Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev: React1512Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev: HTML1527Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev: from an image1529Not measuredOnly Claude Sonnet 4.6 measured
Neither model has a result on the other 19 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 4.6 and Grok 4.20
BenchmarkClaude Sonnet 4.6Grok 4.20Leader
AA Intelligence Index30.125.7Claude Sonnet 4.6
Epoch Capabilities Index152.8152.1Claude Sonnet 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index101
Agentic work benchmarks for Claude Sonnet 4.6 and Grok 4.20
BenchmarkClaude Sonnet 4.6Grok 4.20Leader
AA Agentic Index31.8Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building web apps11901144Claude Sonnet 4.6
Design Arena: agents building full-stack apps12131054Claude Sonnet 4.6
Design Arena: agents building mobile apps12121090Claude Sonnet 4.6
Design Arena: agents building Android apps11961052Claude Sonnet 4.6
Design Arena: agents building Godot games12261089Claude Sonnet 4.6
Design Arena: agents building games1177Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: HTML slidesNot measured1180Only Grok 4.20 measured
LiveBench research63.6%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench browser68.0%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench long agentic23.1%Not measuredOnly Claude Sonnet 4.6 measured
Finance Agent (Vals AI)51.0%28.5%Claude Sonnet 4.6
Tax Agent Bench (Vals AI)25.8%7.0%Claude Sonnet 4.6
Legal Research Bench (Vals AI)38.5%13.9%Claude Sonnet 4.6
Excel Modeling Benchmark (Vals AI)60.2%11.7%Claude Sonnet 4.6
τ²-Bench Telecom79.5%93.0%Grok 4.20
APEX-Agents43.0%Not measuredOnly Claude Sonnet 4.6 measured
OSWorld 2.09.3%Not measuredOnly Claude Sonnet 4.6 measured
DeepResearch Bench54.9%Not measuredOnly Claude Sonnet 4.6 measured
OSWorld72.1%Not measuredOnly Claude Sonnet 4.6 measured
Vending-Bench 2$7,204$4,663Claude Sonnet 4.6
Neither model has a result on the other 20 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index15
Reasoning benchmarks for Claude Sonnet 4.6 and Grok 4.20
BenchmarkClaude Sonnet 4.6Grok 4.20Leader
GPQA Diamond85.6%88.6%Grok 4.20
LiveBench reasoning86.4%Not measuredOnly Claude Sonnet 4.6 measured
MMMU Pro (Vals AI)83.6%83.5%Claude Sonnet 4.6
GPQA Diamond (Artificial Analysis run)87.5%91.1%Grok 4.20
Humanity's Last Exam (Artificial Analysis run)33.6%34.5%Grok 4.20
GPQA Diamond (Epoch AI run)87.4%Not measuredOnly Claude Sonnet 4.6 measured
ARC-AGI86.5%89.5%Grok 4.20
ARC-AGI-260.4%65.1%Grok 4.20
Chess puzzles23.0%Not measuredOnly Claude Sonnet 4.6 measured
Mystery game puzzles16.0%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: hard prompts1485Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: expert1500Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: hard prompts in English1493Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: diagrams1306Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: homework1311Not measuredOnly Claude Sonnet 4.6 measured
Kagi LLM BenchmarkNot measured75.0%Only Grok 4.20 measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index01
Math benchmarks for Claude Sonnet 4.6 and Grok 4.20
BenchmarkClaude Sonnet 4.6Grok 4.20Leader
AIME92.3%96.5%Grok 4.20
OTIS Mock AIME85.8%Not measuredOnly Claude Sonnet 4.6 measured
ProofBench45.0%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: math1462Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: mathematical work1483Not measuredOnly Claude Sonnet 4.6 measured
Neither model has a result on the other 8 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index61
Knowledge benchmarks for Claude Sonnet 4.6 and Grok 4.20
BenchmarkClaude Sonnet 4.6Grok 4.20Leader
MMLU Pro87.3%86.3%Claude Sonnet 4.6
LegalBench (Vals AI)82.1%77.7%Claude Sonnet 4.6
CaseLaw (Vals AI)64.0%54.4%Claude Sonnet 4.6
CorpFin (Vals AI)65.3%63.7%Claude Sonnet 4.6
TaxEval (Vals AI)77.1%74.1%Claude Sonnet 4.6
MortgageTax (Vals AI)67.7%45.4%Claude Sonnet 4.6
MedQA (Vals AI)92.1%94.5%Grok 4.20
MedCode (Vals AI)Not measured32.2%Only Grok 4.20 measured
SimpleQA Verified35.5%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: science1474Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: medicine and healthcare1451Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: legal and government1470Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: business and finance1464Not measuredOnly Claude Sonnet 4.6 measured
FACTS Benchmark Suite37.0%Not measuredOnly Claude Sonnet 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 Sonnet 4.6 and Grok 4.20
BenchmarkClaude Sonnet 4.6Grok 4.20Leader
Design Arena: websites12851229Claude Sonnet 4.6
Design Arena: UI components12721199Claude Sonnet 4.6
Design Arena: game dev12591192Claude Sonnet 4.6
Design Arena: data viz12771217Claude Sonnet 4.6
Design Arena: 3D12341193Claude Sonnet 4.6
Design Arena: all code categories12761221Claude Sonnet 4.6
Design Arena: SVG11971164Claude Sonnet 4.6
Design Arena: ASCII art12351174Claude Sonnet 4.6
LiveBench design71.8%Not measuredOnly Claude Sonnet 4.6 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index42
General benchmarks for Claude Sonnet 4.6 and Grok 4.20
BenchmarkClaude Sonnet 4.6Grok 4.20Leader
LiveBench data analysis76.1%Not measuredOnly Claude Sonnet 4.6 measured
Public Benefits Bench (Vals AI)62.5%Not measuredOnly Claude Sonnet 4.6 measured
SAGE (Vals AI)46.6%38.2%Claude Sonnet 4.6
MedScribe (Vals AI)Not measured63.4%Only Grok 4.20 measured
Vals Multimodal Index60.6%39.1%Claude Sonnet 4.6
IFBench56.6%81.2%Grok 4.20
Long context reasoning (AA-LCR)80.0%69.0%Claude Sonnet 4.6
DTBench89.9%90.1%Grok 4.20
LMCA46.5%38.7%Claude Sonnet 4.6
CL-benchNot measured22.2%Only Grok 4.20 measured
ExploitBench23.6%Not measuredOnly Claude Sonnet 4.6 measured
CL-bench LifeNot measured11.9%Only Grok 4.20 measured
LMArena Text1458Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: instruction following1476Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: creative writing1435Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision1283Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: English1472Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: non-English1440Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: Chinese1491Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: German1428Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: Japanese1420Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: Korean1410Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: French1465Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: Spanish1464Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: Russian1440Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: Polish1443Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: multi-turn1464Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: longer queries1479Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: writing and language1444Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: entertainment and media1431Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: English1298Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: Chinese1307Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: reading text1296Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: humor1248Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: recognizing things1195Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: creative writing1272Not measuredOnly Claude Sonnet 4.6 measured
LMArena Document1482Not measuredOnly Claude Sonnet 4.6 measured
Neither model has a result on the other 9 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 4.6 and Grok 4.20
BenchmarkClaude Sonnet 4.6Grok 4.20Leader
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 Sonnet 4.6$0.011Fits in one request
Grok 4.20$0.0025Fits in one request

Grok 4.20 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 4.6$0.195Fits in one request
Grok 4.20$0.070Fits in one request

Grok 4.20 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.6$0.750Fits in one request
Grok 4.20$0.275Fits in one request

Grok 4.20 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 Sonnet 4.6 and Grok 4.20
SpecificationAnthropic Claude Sonnet 4.6SpaceXAI Grok 4.20
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 17, 2026March 31, 2026
Context window1M2M
Input $/Mtok$3.00$1.25
Output $/Mtok$15.00$2.50
Coding index57.333.3
Independent measurements behind it52
Cost per solved task$1.68$0.72
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 4.6 better than Grok 4.20 for coding?

Pick Claude Sonnet 4.6 for coding: it scores 57.3 on the Vibe Coding Index against 33.3 for Grok 4.20. Pick Grok 4.20 for output tokens 6.0x cheaper ($2.50 vs $15.00 per million) and a lower cost per solved task ($0.72 against $1.68).

Which is cheaper, Claude Sonnet 4.6 or Grok 4.20?

Claude Sonnet 4.6 costs $3.00 per million input tokens and $15.00 per million output tokens; Grok 4.20 costs $1.25 and $2.50. Per solved SWE-bench Verified task, Claude Sonnet 4.6 costs $1.68 and Grok 4.20 $0.72.

Which has the bigger context window, Claude Sonnet 4.6 or Grok 4.20?

Grok 4.20, with 2M tokens against 1M.

How many benchmarks is the Claude Sonnet 4.6 vs Grok 4.20 comparison based on?

49 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 4.6's coding index rests on 5 independent benchmarks and Grok 4.20's on 2. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/claude-sonnet-4-6-vs-grok-4-20">LLMBenchmark.ai, Claude Sonnet 4.6 vs Grok 4.20</a></p>