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Claude Opus 5.5 vs Grok 4.6

Claude Opus 5.5 leads Grok 4.6 on coding, 88.8 to 65.7 on the Vibe Coding Index, and Grok 4.6 costs 3.3x less per output token ($6.00 vs $20.00 per million). Updated October 22, 2026; 96 benchmarks have a result for both.

Replace Claude Opus 5.5 Replace Grok 4.6
Claude Opus 5.5Anthropic
Coding
88.8
Overall
87.1
Output $/M
$20.00
95
Grok 4.6xAI
Coding
65.7
Overall
67.4
Output $/M
$6.00
1
vs boards won of 96 shared

Claude Opus 5.5 or Grok 4.6: which to pick

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 65.7 for Grok 4.6, though on 5 benchmarks against 6.

Pick Grok 4.6 for output tokens 3.3x cheaper ($6.00 vs $20.00 per million) and work measured by GPQA Diamond (Epoch AI run), where it leads.

Model AClaude Opus 5.5Anthropic88.8/1005 independent benchmarksNo cost per solved taskModel BGrok 4.6xAI65.7/1006 independent benchmarks$0.82 per solved task
Shared results
96
Claude Opus 5.5 only
13
Grok 4.6 only
27
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 5.5 88.8 from 5 benchmarks, Grok 4.6 65.7 from 6 benchmarks.
Widest category
Math, 27.3 points apart on average over 6 shared benchmarks.
Widest single gap
Time Horizon Index (Vals AI): Claude Opus 5.5 91.3% against Grok 4.6 5.8%, 85.5 points apart on a 0 to 100 scale.
Output price
Claude Opus 5.5 $20.00 against Grok 4.6 $6.00 per million output tokens, 3.3x apart.
Context window
Claude Opus 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 Opus 5.5BarsGrok 4.6Ties
Coding190
Intelligence20
Agentic work150
Reasoning131
Math60
Knowledge60
Web design80
General260
All shared boards951
CodingLike-for-likeSix of these boards feed the Vibe Coding Index190
Coding benchmarks for Claude Opus 5.5 and Grok 4.6
BenchmarkClaude Opus 5.5Grok 4.6Leader
LiveBench coding96.3%89.1%Claude Opus 5.5
LMArena WebDev18071617Claude Opus 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)65.2%17.2%Claude Opus 5.5
Vibe Code Bench (Vals AI)90.3%76.2%Claude Opus 5.5
Code migration (Vals AI)66.7%44.6%Claude Opus 5.5
ProgramBench (Vals AI)18.5%1.0%Claude Opus 5.5
IOI (Vals AI)95.1%47.6%Claude Opus 5.5
Terminal-Bench 2.1 (Vals AI)87.6%78.3%Claude Opus 5.5
SWE-bench Multimodal (Vals AI)70.2%Not measuredOnly Claude Opus 5.5 measured
Vibe Code Bench 1-100 (Vals AI)30.4%14.8%Claude Opus 5.5
SkillsBench (Vals AI)Not measured55.8%Only Grok 4.6 measured
CyberBench (Vals AI)74.6%67.7%Claude Opus 5.5
SciCode66.9%56.5%Claude Opus 5.5
FrontierCode54.6%48.0%Claude Opus 5.5
FrontierSWE62.3%25.3%Claude Opus 5.5
WeirdMLNot measured67.3%Only Grok 4.6 measured
MirrorCode77.4%Not measuredOnly Claude Opus 5.5 measured
ALE-Bench2147.41508.1Claude Opus 5.5
LMArena Text: coding15451466Claude Opus 5.5
LMArena Text: software and IT15381457Claude Opus 5.5
LMArena WebDev: React18551631Claude Opus 5.5
LMArena WebDev: HTML17531597Claude Opus 5.5
LMArena WebDev: from an image17531603Claude Opus 5.5
SciCode18.5%Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5.5 and Grok 4.6
BenchmarkClaude Opus 5.5Grok 4.6Leader
AA Intelligence Index57.644.3Claude Opus 5.5
Epoch Capabilities Index168.8156.6Claude Opus 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index150
Agentic work benchmarks for Claude Opus 5.5 and Grok 4.6
BenchmarkClaude Opus 5.5Grok 4.6Leader
AA Agentic IndexNot measured53.0Only Grok 4.6 measured
Design Arena: agents building web apps13161248Claude Opus 5.5
Design Arena: agents building full-stack appsNot measured1264Only Grok 4.6 measured
Design Arena: agents building mobile apps13081234Claude Opus 5.5
Design Arena: agents building Android appsNot measured1291Only Grok 4.6 measured
Design Arena: agents building Godot gamesNot measured1276Only Grok 4.6 measured
Design Arena: agents building gamesNot measured1209Only Grok 4.6 measured
Design Arena: HTML slidesNot measured1250Only Grok 4.6 measured
Design Arena: PowerPoint slidesNot measured1237Only Grok 4.6 measured
Design Arena: spreadsheets1368Not measuredOnly Claude Opus 5.5 measured
LiveBench research85.0%84.5%Claude Opus 5.5
LiveBench browser80.0%64.0%Claude Opus 5.5
LiveBench long agentic85.0%40.7%Claude Opus 5.5
SREBench (Vals AI)33.6%Not measuredOnly Claude Opus 5.5 measured
Finance Agent (Vals AI)58.6%53.7%Claude Opus 5.5
Tax Agent Bench (Vals AI)45.6%33.1%Claude Opus 5.5
Legal Research Bench (Vals AI)50.5%48.1%Claude Opus 5.5
Harvey's Legal Agent Benchmark (Vals AI)9.2%Not measuredOnly Claude Opus 5.5 measured
Excel Modeling Benchmark (Vals AI)75.9%62.7%Claude Opus 5.5
BioMysteryBench (Vals AI)79.3%72.2%Claude Opus 5.5
Terminal-Bench-Science (Vals AI)47.1%11.4%Claude Opus 5.5
Vals Science Index58.7%38.1%Claude Opus 5.5
Time Horizon Index (Vals AI)91.3%5.8%Claude Opus 5.5
CUA-bench (Vals AI)14.0%Not measuredOnly Claude Opus 5.5 measured
Robo-bench (Vals AI)14.6%Not measuredOnly Claude Opus 5.5 measured
APEX-Agents73.5%65.3%Claude Opus 5.5
Remote Labor Index21.3%Not measuredOnly Claude Opus 5.5 measured
SpireClimb3.3%Not measuredOnly Claude Opus 5.5 measured
Vending-Bench 2$9,235$9,047Claude Opus 5.5
LMArena Search1213Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index131
Reasoning benchmarks for Claude Opus 5.5 and Grok 4.6
BenchmarkClaude Opus 5.5Grok 4.6Leader
GPQA DiamondNot measured94.7%Only Grok 4.6 measured
LiveBench reasoning92.2%91.2%Claude Opus 5.5
MysteryMechanism (Vals AI)49.5%30.6%Claude Opus 5.5
GPQA Diamond (Artificial Analysis run)Not measured94.9%Only Grok 4.6 measured
Humanity's Last Exam (Artificial Analysis run)61.4%44.1%Claude Opus 5.5
GPQA Diamond (Epoch AI run)90.6%94.0%Grok 4.6
ARC-AGI98.5%87.5%Claude Opus 5.5
ARC-AGI-293.3%67.1%Claude Opus 5.5
SimpleBenchNot measured75.9%Only Grok 4.6 measured
Chess puzzles67.0%33.0%Claude Opus 5.5
Mystery game puzzles71.0%34.0%Claude Opus 5.5
EBR-bench71.4%30.5%Claude Opus 5.5
LMArena Text: hard prompts15361448Claude Opus 5.5
LMArena Text: expert15491469Claude Opus 5.5
LMArena Text: hard prompts in English15351445Claude Opus 5.5
LMArena Vision: diagrams13451285Claude Opus 5.5
LMArena Vision: homework13621283Claude Opus 5.5
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 5.5 and Grok 4.6
BenchmarkClaude Opus 5.5Grok 4.6Leader
OTIS Mock AIME100.0%99.2%Claude Opus 5.5
FrontierMath, tiers 1 to 391.2%66.0%Claude Opus 5.5
FrontierMath, tier 495.0%31.7%Claude Opus 5.5
ProofBench100.0%51.0%Claude Opus 5.5
LMArena Text: math15181417Claude Opus 5.5
LMArena Text: mathematical work15161464Claude Opus 5.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
Knowledge benchmarks for Claude Opus 5.5 and Grok 4.6
BenchmarkClaude Opus 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)49.8%44.7%Claude Opus 5.5
SimpleQA Verified72.2%49.3%Claude Opus 5.5
LMArena Text: science15241437Claude Opus 5.5
LMArena Text: medicine and healthcare15091420Claude Opus 5.5
LMArena Text: legal and government15181429Claude Opus 5.5
LMArena Text: business and finance14941416Claude Opus 5.5
FACTS Benchmark Suite65.3%Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 5.5 and Grok 4.6
BenchmarkClaude Opus 5.5Grok 4.6Leader
Design Arena: websites13351289Claude Opus 5.5
Design Arena: UI components13851294Claude Opus 5.5
Design Arena: game dev14611296Claude Opus 5.5
Design Arena: data viz13971282Claude Opus 5.5
Design Arena: 3D14761277Claude Opus 5.5
Design Arena: all code categories13901292Claude Opus 5.5
Design Arena: SVG13291240Claude Opus 5.5
Design Arena: ASCII artNot measured1279Only Grok 4.6 measured
LiveBench design86.9%79.8%Claude Opus 5.5
GeneralLike-for-likePublic boards, shown as published, kept out of the index260
General benchmarks for Claude Opus 5.5 and Grok 4.6
BenchmarkClaude Opus 5.5Grok 4.6Leader
Vals Index70.2%Not measuredOnly Claude Opus 5.5 measured
LiveBench data analysis80.3%75.3%Claude Opus 5.5
Public Benefits Bench (Vals AI)70.6%66.8%Claude Opus 5.5
SAGE (Vals AI)45.8%28.9%Claude Opus 5.5
MedScribe (Vals AI)91.4%86.5%Claude Opus 5.5
Long context reasoning (AA-LCR)84.7%81.0%Claude Opus 5.5
DTBench98.9%97.3%Claude Opus 5.5
LMCA68.2%48.5%Claude Opus 5.5
Furniture assembly83.3%40.0%Claude Opus 5.5
LMArena Text15161429Claude Opus 5.5
LMArena Text: instruction following15371431Claude Opus 5.5
LMArena Text: creative writing15351426Claude Opus 5.5
LMArena Vision13211263Claude Opus 5.5
LMArena Text: English15191433Claude Opus 5.5
LMArena Text: non-English15071420Claude Opus 5.5
LMArena Text: Chinese15821476Claude Opus 5.5
LMArena Text: GermanNot measured1426Only Grok 4.6 measured
LMArena Text: Japanese15341378Claude Opus 5.5
LMArena Text: KoreanNot measured1391Only Grok 4.6 measured
LMArena Text: French14931455Claude Opus 5.5
LMArena Text: Spanish15081414Claude Opus 5.5
LMArena Text: Russian15171421Claude Opus 5.5
LMArena Text: PolishNot measured1430Only Grok 4.6 measured
LMArena Text: multi-turn15011425Claude Opus 5.5
LMArena Text: longer queries15321456Claude Opus 5.5
LMArena Text: writing and language15321429Claude Opus 5.5
LMArena Text: entertainment and media15151421Claude Opus 5.5
LMArena Vision: English13171270Claude Opus 5.5
LMArena Vision: ChineseNot measured1289Only Grok 4.6 measured
LMArena Vision: reading text13261272Claude Opus 5.5
LMArena Vision: humorNot measured1270Only Grok 4.6 measured
LMArena Vision: creative writing13201262Claude Opus 5.5
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 Opus 5.5 and Grok 4.6
BenchmarkClaude Opus 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 Opus 5.5$0.014Fits in one request
Grok 4.6$0.0050Fits in one request

Grok 4.6 costs less

Repository review

50K input + 3K output tokens

Claude Opus 5.5$0.260Fits in one request
Grok 4.6$0.118Fits in one request

Grok 4.6 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5.5$1.00Fits 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 Opus 5.5 and Grok 4.6
SpecificationAnthropic Claude Opus 5.5SpaceXAI Grok 4.6
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 22, 2026August 12, 2026
Context window1M500K
Input $/Mtok$4.00$2.00
Output $/Mtok$20.00$6.00
Coding index88.865.7
Independent measurements behind it56
Cost per solved taskNot computable$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5.5 better than Grok 4.6 for coding?

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 65.7 for Grok 4.6, though on 5 benchmarks against 6. Pick Grok 4.6 for output tokens 3.3x cheaper ($6.00 vs $20.00 per million) and work measured by GPQA Diamond (Epoch AI run), where it leads.

Which is cheaper, Claude Opus 5.5 or Grok 4.6?

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 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 Opus 5.5 or Grok 4.6?

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

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

96 benchmarks have a result for both models as of October 22, 2026. Claude Opus 5.5's coding index rests on 5 independent benchmarks and Grok 4.6's on 6. Where only one model has a result, the page says so instead of naming a winner.

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