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Claude Opus 5 vs Grok 4.6

Updated October 21, 2026. 122 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 5 Replace Grok 4.6
Claude Opus 5Anthropic
Coding
81.8
Overall
50.8
Output $/M
$25.00
113
Grok 4.6xAI
Coding
76.4
Overall
44.3
Output $/M
$6.00
8
vs boards won of 122 shared, 1 tied

Decision reading

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 76.4 for Grok 4.6.

Pick Grok 4.6 when output tokens cost 4.2x less, or when a solved task costs $0.82 against $1.33.

Model AClaude Opus 5Anthropic81.8/1002 independent benchmarks$1.33 per solved taskModel BGrok 4.6xAI76.4/1002 independent benchmarks$0.82 per solved task
Shared results
122
Claude Opus 5 only
8
Grok 4.6 only
1
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 Opus 5 81.8 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 Opus 5 99.0% against Grok 4.6 51.0%, 48.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Grok 4.6 $6.00 per million output tokens, 4.2x apart.
Context window
Claude Opus 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 5BarsGrok 4.6Ties
Coding222
Intelligence20
Agentic work201
Reasoning1331 tie
Math51
Knowledge110
Web design90
General311
All shared boards11381 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index222
Coding benchmarks for Claude Opus 5 and Grok 4.6
BenchmarkClaude Opus 5Grok 4.6Leader
LiveBench coding90.8%89.1%Claude Opus 5
LMArena WebDev16891617Claude Opus 5
AA Coding Index78.076.8Claude Opus 5
LiveCodeBench (Vals AI)89.0%88.2%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%95.6%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%17.2%Claude Opus 5
Vibe Code Bench (Vals AI)88.4%76.2%Claude Opus 5
Code migration (Vals AI)57.5%44.6%Claude Opus 5
ProgramBench (Vals AI)3.0%1.0%Claude Opus 5
IOI (Vals AI)84.3%47.6%Claude Opus 5
Terminal-Bench 2.1 (Vals AI)84.6%78.3%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%14.8%Claude Opus 5
SkillsBench (Vals AI)60.4%55.8%Claude Opus 5
CyberBench (Vals AI)65.4%67.7%Grok 4.6
SciCode56.4%56.5%Grok 4.6
FrontierCode53.4%48.0%Claude Opus 5
FrontierSWE52.0%25.3%Claude Opus 5
WeirdML91.8%67.3%Claude Opus 5
ALE-Bench2164.61508.1Claude Opus 5
LMArena Text: coding15331466Claude Opus 5
LMArena Text: software and IT15271457Claude Opus 5
LMArena WebDev: React17111631Claude Opus 5
LMArena WebDev: HTML16801597Claude Opus 5
LMArena WebDev: from an image16621603Claude Opus 5
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and Grok 4.6
BenchmarkClaude Opus 5Grok 4.6Leader
AA Intelligence Index50.844.3Claude Opus 5
Epoch Capabilities Index163.9156.6Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index201
Agentic work benchmarks for Claude Opus 5 and Grok 4.6
BenchmarkClaude Opus 5Grok 4.6Leader
AA Agentic Index56.553.0Claude Opus 5
Design Arena: agents building web apps12661247Claude Opus 5
Design Arena: agents building full-stack apps13061264Claude Opus 5
Design Arena: agents building mobile apps13481234Claude Opus 5
Design Arena: agents building Android apps12581297Grok 4.6
Design Arena: agents building Godot games12791276Claude Opus 5
Design Arena: agents building games12611208Claude Opus 5
Design Arena: HTML slidesNot measured1249Only Grok 4.6 measured
Design Arena: PowerPoint slides12651241Claude Opus 5
LiveBench research88.9%84.5%Claude Opus 5
LiveBench browser84.0%64.0%Claude Opus 5
LiveBench long agentic62.1%40.7%Claude Opus 5
SREBench (Vals AI)12.2%Not measuredOnly Claude Opus 5 measured
Finance Agent (Vals AI)58.6%53.7%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%33.1%Claude Opus 5
Legal Research Bench (Vals AI)55.3%48.1%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%62.7%Claude Opus 5
BioMysteryBench (Vals AI)79.3%72.2%Claude Opus 5
Terminal-Bench-Science (Vals AI)27.1%11.4%Claude Opus 5
Vals Science Index47.9%38.1%Claude Opus 5
Time Horizon Index (Vals AI)18.8%5.8%Claude Opus 5
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
APEX-Agents65.8%65.3%Claude Opus 5
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182$9,047Claude Opus 5
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index133
Reasoning benchmarks for Claude Opus 5 and Grok 4.6
BenchmarkClaude Opus 5Grok 4.6Leader
GPQA Diamond93.4%94.7%Grok 4.6
LiveBench reasoning91.2%91.2%Tie
MysteryMechanism (Vals AI)37.4%30.6%Claude Opus 5
MMMU Pro (Vals AI)89.9%Not measuredOnly Claude Opus 5 measured
GPQA Diamond (Artificial Analysis run)93.7%94.9%Grok 4.6
Humanity's Last Exam (Artificial Analysis run)54.9%44.1%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%94.0%Grok 4.6
ARC-AGI97.5%87.5%Claude Opus 5
ARC-AGI-290.4%67.1%Claude Opus 5
SimpleBench80.6%75.9%Claude Opus 5
Chess puzzles43.0%33.0%Claude Opus 5
Mystery game puzzles59.0%34.0%Claude Opus 5
EBR-bench45.7%30.5%Claude Opus 5
LMArena Text: hard prompts15271448Claude Opus 5
LMArena Text: expert15541469Claude Opus 5
LMArena Text: hard prompts in English15231445Claude Opus 5
LMArena Vision: diagrams13481285Claude Opus 5
LMArena Vision: homework13381283Claude Opus 5
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index51
Math benchmarks for Claude Opus 5 and Grok 4.6
BenchmarkClaude Opus 5Grok 4.6Leader
OTIS Mock AIME98.9%99.2%Grok 4.6
FrontierMath, tiers 1 to 385.6%66.0%Claude Opus 5
FrontierMath, tier 473.2%31.7%Claude Opus 5
ProofBench99.0%51.0%Claude Opus 5
LMArena Text: math15331417Claude Opus 5
LMArena Text: mathematical work15441464Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Opus 5 and Grok 4.6
BenchmarkClaude Opus 5Grok 4.6Leader
MMLU Pro91.6%89.4%Claude Opus 5
LegalBench (Vals AI)87.0%86.3%Claude Opus 5
CorpFin (Vals AI)73.2%66.2%Claude Opus 5
TaxEval (Vals AI)75.1%71.1%Claude Opus 5
MortgageTax (Vals AI)72.1%64.2%Claude Opus 5
MedCode (Vals AI)63.6%44.7%Claude Opus 5
SimpleQA Verified59.9%49.3%Claude Opus 5
LMArena Text: science15311437Claude Opus 5
LMArena Text: medicine and healthcare15251420Claude Opus 5
LMArena Text: legal and government15301429Claude Opus 5
LMArena Text: business and finance15011416Claude Opus 5
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for Claude Opus 5 and Grok 4.6
BenchmarkClaude Opus 5Grok 4.6Leader
Design Arena: websites13091289Claude Opus 5
Design Arena: UI components13481294Claude Opus 5
Design Arena: game dev13391296Claude Opus 5
Design Arena: data viz13291283Claude Opus 5
Design Arena: 3D13351277Claude Opus 5
Design Arena: all code categories13241292Claude Opus 5
Design Arena: SVG13101239Claude Opus 5
Design Arena: ASCII art13521278Claude Opus 5
LiveBench design83.0%79.8%Claude Opus 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index311
General benchmarks for Claude Opus 5 and Grok 4.6
BenchmarkClaude Opus 5Grok 4.6Leader
LiveBench data analysis74.6%75.3%Grok 4.6
Public Benefits Bench (Vals AI)76.9%66.8%Claude Opus 5
SAGE (Vals AI)49.4%28.9%Claude Opus 5
MedScribe (Vals AI)91.0%86.5%Claude Opus 5
Vals Multimodal Index73.9%Not measuredOnly Claude Opus 5 measured
Long context reasoning (AA-LCR)82.0%81.0%Claude Opus 5
DTBench97.9%97.3%Claude Opus 5
LMCA64.5%48.5%Claude Opus 5
Furniture assembly60.8%40.0%Claude Opus 5
LMArena Text15091429Claude Opus 5
LMArena Text: instruction following15181431Claude Opus 5
LMArena Text: creative writing14931426Claude Opus 5
LMArena Vision13201263Claude Opus 5
LMArena Text: English15081433Claude Opus 5
LMArena Text: non-English15021420Claude Opus 5
LMArena Text: Chinese15731476Claude Opus 5
LMArena Text: German15271426Claude Opus 5
LMArena Text: Japanese15201378Claude Opus 5
LMArena Text: Korean15171391Claude Opus 5
LMArena Text: French15191455Claude Opus 5
LMArena Text: Spanish15231414Claude Opus 5
LMArena Text: Russian15071421Claude Opus 5
LMArena Text: Polish15221430Claude Opus 5
LMArena Text: multi-turn15001425Claude Opus 5
LMArena Text: longer queries15171456Claude Opus 5
LMArena Text: writing and language14991429Claude Opus 5
LMArena Text: entertainment and media14811421Claude Opus 5
LMArena Vision: English13151270Claude Opus 5
LMArena Vision: Chinese14001289Claude Opus 5
LMArena Vision: reading text13291272Claude Opus 5
LMArena Vision: humor12931270Claude Opus 5
LMArena Vision: creative writing13131262Claude Opus 5
LMArena Document15161452Claude Opus 5
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 and Grok 4.6
BenchmarkClaude Opus 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$0.018Fits 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$0.325Fits 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$1.25Fits 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 and Grok 4.6
SpecificationAnthropic Claude Opus 5SpaceXAI Grok 4.6
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026August 12, 2026
Context window1M500K
Input $/Mtok$5.00$2.00
Output $/Mtok$25.00$6.00
Coding index81.876.4
Independent measurements behind it22
Cost per solved task$1.33$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than Grok 4.6 for coding?

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 76.4 for Grok 4.6. Pick Grok 4.6 when output tokens cost 4.2x less, or when a solved task costs $0.82 against $1.33.

Which is cheaper, Claude Opus 5 or Grok 4.6?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Grok 4.6 costs $2.00 and $6.00. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and Grok 4.6 $0.82.

Which has the bigger context window, Claude Opus 5 or Grok 4.6?

Claude Opus 5, with 1M tokens against 500K.

How many benchmarks is the Claude Opus 5 vs Grok 4.6 comparison based on?

122 benchmarks have a result for both models as of October 21, 2026. Claude Opus 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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