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Claude Sonnet 5.5 vs Grok 4.6

Updated October 21, 2026. 89 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Sonnet 5.5 Replace Grok 4.6
Claude Sonnet 5.5Anthropic
Coding
88.9
Overall
56.0
Output $/M
$10.00
82
Grok 4.6xAI
Coding
76.4
Overall
44.3
Output $/M
$6.00
5
vs boards won of 89 shared, 2 tied

Decision reading

Pick Claude Sonnet 5.5 for coding: it scores 88.9 on the Vibe Coding Index against 76.4 for Grok 4.6.

Pick Grok 4.6 when output tokens cost 1.7x less, or when what matters is CyberBench (Vals AI) or LiveBench research, where it leads.

Model AClaude Sonnet 5.5Anthropic88.9/1002 independent benchmarksNo cost per solved taskModel BGrok 4.6xAI76.4/1002 independent benchmarks$0.82 per solved task
Shared results
89
Claude Sonnet 5.5 only
6
Grok 4.6 only
34
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 5.5 88.9 from 2 benchmarks, Grok 4.6 76.4 from 2 benchmarks.
Widest category
Math, 23.7 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Sonnet 5.5 100.0% against Grok 4.6 51.0%, 49.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5.5 $10.00 against Grok 4.6 $6.00 per million output tokens, 1.7x apart.
Context window
Claude Sonnet 5.5 takes 1M tokens, Grok 4.6 500K.

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 5.5BarsGrok 4.6Ties
Coding171
Intelligence20
Agentic work1211 tie
Reasoning110
Math60
Knowledge51
Web design70
General2221 tie
All shared boards8252 ties
CodingLike-for-likeFour of these boards feed the Vibe Coding Index171
Coding benchmarks for Claude Sonnet 5.5 and Grok 4.6
BenchmarkClaude Sonnet 5.5Grok 4.6Leader
LiveBench coding94.7%89.1%Claude Sonnet 5.5
LMArena WebDev17681617Claude Sonnet 5.5
AA Coding IndexNot measured76.8Only Grok 4.6 measured
LiveCodeBench (Vals AI)Not measured88.2%Only Grok 4.6 measured
SWE-bench Verified (Vals AI)Not measured95.6%Only Grok 4.6 measured
Terminal-Bench 4 (Vals AI)64.1%17.2%Claude Sonnet 5.5
Vibe Code Bench (Vals AI)92.4%76.2%Claude Sonnet 5.5
Code migration (Vals AI)69.8%44.6%Claude Sonnet 5.5
ProgramBench (Vals AI)6.5%1.0%Claude Sonnet 5.5
IOI (Vals AI)83.1%47.6%Claude Sonnet 5.5
Terminal-Bench 2.1 (Vals AI)83.2%78.3%Claude Sonnet 5.5
SWE-bench Multimodal (Vals AI)58.3%Not measuredOnly Claude Sonnet 5.5 measured
Vibe Code Bench 1-100 (Vals AI)Not measured14.8%Only Grok 4.6 measured
SkillsBench (Vals AI)Not measured55.8%Only Grok 4.6 measured
CyberBench (Vals AI)59.6%67.7%Grok 4.6
SciCode61.0%56.5%Claude Sonnet 5.5
FrontierCode52.1%48.0%Claude Sonnet 5.5
FrontierSWE61.9%25.3%Claude Sonnet 5.5
WeirdMLNot measured67.3%Only Grok 4.6 measured
ALE-Bench1819.11508.1Claude Sonnet 5.5
LMArena Text: coding15131466Claude Sonnet 5.5
LMArena Text: software and IT15041457Claude Sonnet 5.5
LMArena WebDev: React18171631Claude Sonnet 5.5
LMArena WebDev: HTML17411597Claude Sonnet 5.5
LMArena WebDev: from an image17371603Claude Sonnet 5.5
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 5.5 and Grok 4.6
BenchmarkClaude Sonnet 5.5Grok 4.6Leader
AA Intelligence Index56.044.3Claude Sonnet 5.5
Epoch Capabilities Index166.2156.6Claude Sonnet 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index121
Agentic work benchmarks for Claude Sonnet 5.5 and Grok 4.6
BenchmarkClaude Sonnet 5.5Grok 4.6Leader
AA Agentic IndexNot measured53.0Only Grok 4.6 measured
Design Arena: agents building web apps13031247Claude Sonnet 5.5
Design Arena: agents building full-stack appsNot measured1264Only Grok 4.6 measured
Design Arena: agents building mobile apps12651234Claude Sonnet 5.5
Design Arena: agents building Android appsNot measured1297Only Grok 4.6 measured
Design Arena: agents building Godot gamesNot measured1276Only Grok 4.6 measured
Design Arena: agents building gamesNot measured1208Only Grok 4.6 measured
Design Arena: HTML slidesNot measured1249Only Grok 4.6 measured
Design Arena: PowerPoint slidesNot measured1241Only Grok 4.6 measured
Design Arena: spreadsheets1245Not measuredOnly Claude Sonnet 5.5 measured
LiveBench research83.6%84.5%Grok 4.6
LiveBench browser84.0%64.0%Claude Sonnet 5.5
LiveBench long agentic78.8%40.7%Claude Sonnet 5.5
SREBench (Vals AI)30.1%Not measuredOnly Claude Sonnet 5.5 measured
Finance Agent (Vals AI)58.1%53.7%Claude Sonnet 5.5
Tax Agent Bench (Vals AI)42.0%33.1%Claude Sonnet 5.5
Legal Research Bench (Vals AI)48.1%48.1%Tie
Harvey's Legal Agent Benchmark (Vals AI)10.4%Not measuredOnly Claude Sonnet 5.5 measured
Excel Modeling Benchmark (Vals AI)75.7%62.7%Claude Sonnet 5.5
BioMysteryBench (Vals AI)81.1%72.2%Claude Sonnet 5.5
Terminal-Bench-Science (Vals AI)47.1%11.4%Claude Sonnet 5.5
Vals Science Index59.1%38.1%Claude Sonnet 5.5
Time Horizon Index (Vals AI)Not measured5.8%Only Grok 4.6 measured
APEX-Agents75.5%65.3%Claude Sonnet 5.5
SpireClimb1.3%Not measuredOnly Claude Sonnet 5.5 measured
Vending-Bench 2$11,165$9,047Claude Sonnet 5.5
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Claude Sonnet 5.5 and Grok 4.6
BenchmarkClaude Sonnet 5.5Grok 4.6Leader
GPQA DiamondNot measured94.7%Only Grok 4.6 measured
LiveBench reasoning91.6%91.2%Claude Sonnet 5.5
MysteryMechanism (Vals AI)49.1%30.6%Claude Sonnet 5.5
GPQA Diamond (Artificial Analysis run)Not measured94.9%Only Grok 4.6 measured
Humanity's Last Exam (Artificial Analysis run)55.0%44.1%Claude Sonnet 5.5
GPQA Diamond (Epoch AI run)95.6%94.0%Claude Sonnet 5.5
ARC-AGINot measured87.5%Only Grok 4.6 measured
ARC-AGI-2Not measured67.1%Only Grok 4.6 measured
SimpleBenchNot measured75.9%Only Grok 4.6 measured
Chess puzzles59.0%33.0%Claude Sonnet 5.5
Mystery game puzzles65.0%34.0%Claude Sonnet 5.5
EBR-benchNot measured30.5%Only Grok 4.6 measured
LMArena Text: hard prompts14941448Claude Sonnet 5.5
LMArena Text: expert15311469Claude Sonnet 5.5
LMArena Text: hard prompts in English15021445Claude Sonnet 5.5
LMArena Vision: diagrams13291285Claude Sonnet 5.5
LMArena Vision: homework13311283Claude Sonnet 5.5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Sonnet 5.5 and Grok 4.6
BenchmarkClaude Sonnet 5.5Grok 4.6Leader
OTIS Mock AIME100.0%99.2%Claude Sonnet 5.5
FrontierMath, tiers 1 to 388.8%66.0%Claude Sonnet 5.5
FrontierMath, tier 480.5%31.7%Claude Sonnet 5.5
ProofBench100.0%51.0%Claude Sonnet 5.5
LMArena Text: math14971417Claude Sonnet 5.5
LMArena Text: mathematical work15101464Claude Sonnet 5.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index51
Knowledge benchmarks for Claude Sonnet 5.5 and Grok 4.6
BenchmarkClaude Sonnet 5.5Grok 4.6Leader
MMLU ProNot measured89.4%Only Grok 4.6 measured
LegalBench (Vals AI)Not measured86.3%Only Grok 4.6 measured
CorpFin (Vals AI)Not measured66.2%Only Grok 4.6 measured
TaxEval (Vals AI)Not measured71.1%Only Grok 4.6 measured
MortgageTax (Vals AI)Not measured64.2%Only Grok 4.6 measured
MedCode (Vals AI)52.9%44.7%Claude Sonnet 5.5
SimpleQA Verified46.5%49.3%Grok 4.6
LMArena Text: science14831437Claude Sonnet 5.5
LMArena Text: medicine and healthcare14641420Claude Sonnet 5.5
LMArena Text: legal and government14831429Claude Sonnet 5.5
LMArena Text: business and finance14681416Claude Sonnet 5.5
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Claude Sonnet 5.5 and Grok 4.6
BenchmarkClaude Sonnet 5.5Grok 4.6Leader
Design Arena: websites13261289Claude Sonnet 5.5
Design Arena: UI components13671294Claude Sonnet 5.5
Design Arena: game dev14691296Claude Sonnet 5.5
Design Arena: data viz13891283Claude Sonnet 5.5
Design Arena: 3D14581277Claude Sonnet 5.5
Design Arena: all code categories13641292Claude Sonnet 5.5
Design Arena: SVGNot measured1239Only Grok 4.6 measured
Design Arena: ASCII artNot measured1278Only Grok 4.6 measured
LiveBench design85.0%79.8%Claude Sonnet 5.5
GeneralLike-for-likePublic boards, shown as published, kept out of the index222
General benchmarks for Claude Sonnet 5.5 and Grok 4.6
BenchmarkClaude Sonnet 5.5Grok 4.6Leader
Vals Index70.8%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench data analysis59.5%75.3%Grok 4.6
Public Benefits Bench (Vals AI)67.2%66.8%Claude Sonnet 5.5
SAGE (Vals AI)51.8%28.9%Claude Sonnet 5.5
MedScribe (Vals AI)91.1%86.5%Claude Sonnet 5.5
Long context reasoning (AA-LCR)82.7%81.0%Claude Sonnet 5.5
DTBench97.3%97.3%Tie
LMCA68.3%48.5%Claude Sonnet 5.5
Furniture assembly75.0%40.0%Claude Sonnet 5.5
LMArena Text14731429Claude Sonnet 5.5
LMArena Text: instruction following14921431Claude Sonnet 5.5
LMArena Text: creative writing14671426Claude Sonnet 5.5
LMArena Vision12871263Claude Sonnet 5.5
LMArena Text: English14841433Claude Sonnet 5.5
LMArena Text: non-English14561420Claude Sonnet 5.5
LMArena Text: Chinese15351476Claude Sonnet 5.5
LMArena Text: GermanNot measured1426Only Grok 4.6 measured
LMArena Text: JapaneseNot measured1378Only Grok 4.6 measured
LMArena Text: KoreanNot measured1391Only Grok 4.6 measured
LMArena Text: French14991455Claude Sonnet 5.5
LMArena Text: Spanish14511414Claude Sonnet 5.5
LMArena Text: Russian14541421Claude Sonnet 5.5
LMArena Text: PolishNot measured1430Only Grok 4.6 measured
LMArena Text: multi-turn14651425Claude Sonnet 5.5
LMArena Text: longer queries14951456Claude Sonnet 5.5
LMArena Text: writing and language14741429Claude Sonnet 5.5
LMArena Text: entertainment and media14611421Claude Sonnet 5.5
LMArena Vision: English12891270Claude Sonnet 5.5
LMArena Vision: ChineseNot measured1289Only Grok 4.6 measured
LMArena Vision: reading text12971272Claude Sonnet 5.5
LMArena Vision: humorNot measured1270Only Grok 4.6 measured
LMArena Vision: creative writing12421262Grok 4.6
LMArena DocumentNot measured1452Only Grok 4.6 measured
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 5.5 and Grok 4.6
BenchmarkClaude Sonnet 5.5Grok 4.6Leader
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 5.5$0.0070Fits in one request
Grok 4.6$0.0050Fits in one request

Grok 4.6 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5.5$0.130Fits in one request
Grok 4.6$0.118Fits in one request

Grok 4.6 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5.5$0.500Fits in one request
Grok 4.6$0.460Fits in one request

Grok 4.6 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 5.5 and Grok 4.6
SpecificationAnthropic Claude Sonnet 5.5SpaceXAI Grok 4.6
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 28, 2026August 12, 2026
Context window1M500K
Input $/Mtok$2.00$2.00
Output $/Mtok$10.00$6.00
Coding index88.976.4
Independent measurements behind it22
Cost per solved taskNot computable$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5.5 better than Grok 4.6 for coding?

Pick Claude Sonnet 5.5 for coding: it scores 88.9 on the Vibe Coding Index against 76.4 for Grok 4.6. Pick Grok 4.6 when output tokens cost 1.7x less, or when what matters is CyberBench (Vals AI) or LiveBench research, where it leads.

Which is cheaper, Claude Sonnet 5.5 or Grok 4.6?

Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens; Grok 4.6 costs $2.00 and $6.00. Cost per solved task is known for Grok 4.6 only.

Which has the bigger context window, Claude Sonnet 5.5 or Grok 4.6?

Claude Sonnet 5.5, with 1M tokens against 500K.

How many benchmarks is the Claude Sonnet 5.5 vs Grok 4.6 comparison based on?

89 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 5.5's coding index rests on 2 independent benchmarks and Grok 4.6's on 2. Where only one model has a result, the page says so instead of naming a winner.

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