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Claude Opus 4.5 vs Grok 4.6

Grok 4.6 leads Claude Opus 4.5 on coding, 65.7 to 44.0 on the Vibe Coding Index, and Grok 4.6 costs 4.2x less per output token ($6.00 vs $25.00 per million). Updated October 22, 2026; 78 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace Grok 4.6
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
32
Grok 4.6xAI
Coding
65.7
Overall
67.4
Output $/M
$6.00
46
vs boards won of 78 shared

Claude Opus 4.5 or Grok 4.6: which to pick

Pick Grok 4.6 for coding: it scores 65.7 on the Vibe Coding Index against 44.0 for Claude Opus 4.5.

Pick Claude Opus 4.5 for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel BGrok 4.6xAI65.7/1006 independent benchmarks$0.82 per solved task
Shared results
78
Claude Opus 4.5 only
30
Grok 4.6 only
45
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 4.5 44.0 from 3 benchmarks, Grok 4.6 65.7 from 6 benchmarks.
Widest category
Coding, 16.2 points apart on average over 9 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Claude Opus 4.5 20.6% against Grok 4.6 76.2%, 55.6 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against Grok 4.6 $6.00 per million output tokens, 4.2x apart.
Context window
Claude Opus 4.5 takes 200K 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 4.5BarsGrok 4.6Ties
Coding27
Intelligence02
Agentic work05
Reasoning310
Math24
Knowledge74
Web design08
General186
All shared boards3246
CodingLike-for-likeSix of these boards feed the Vibe Coding Index27
Coding benchmarks for Claude Opus 4.5 and Grok 4.6
BenchmarkClaude Opus 4.5Grok 4.6Leader
SWE-bench Verified79.2%Not measuredOnly Claude Opus 4.5 measured
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Multilingual70.7%Not measuredOnly Claude Opus 4.5 measured
LiveBench codingNot measured89.1%Only Grok 4.6 measured
LMArena WebDev14941617Grok 4.6
AA Coding IndexNot measured76.8Only Grok 4.6 measured
LiveCodeBench (Vals AI)83.7%88.2%Grok 4.6
SWE-bench Verified (Vals AI)76.4%95.6%Grok 4.6
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Grok 4.6 measured
Vibe Code Bench (Vals AI)20.6%76.2%Grok 4.6
Code migration (Vals AI)Not measured44.6%Only Grok 4.6 measured
ProgramBench (Vals AI)Not measured1.0%Only Grok 4.6 measured
IOI (Vals AI)Not measured47.6%Only Grok 4.6 measured
Terminal-Bench 2.1 (Vals AI)Not measured78.3%Only Grok 4.6 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)Not measured67.7%Only Grok 4.6 measured
LiveCodeBench (Artificial Analysis run)87.1%Not measuredOnly Claude Opus 4.5 measured
SciCodeNot measured56.5%Only Grok 4.6 measured
Terminal-Bench Hard (Artificial Analysis run)47.0%Not measuredOnly Claude Opus 4.5 measured
Terminal-Bench63.1%Not measuredOnly Claude Opus 4.5 measured
FrontierCodeNot measured48.0%Only Grok 4.6 measured
FrontierSWENot measured25.3%Only Grok 4.6 measured
GSO-Bench26.5%Not measuredOnly Claude Opus 4.5 measured
WeirdML63.7%67.3%Grok 4.6
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
ALE-BenchNot measured1508.1Only Grok 4.6 measured
LMArena Text: coding15031466Claude Opus 4.5
LMArena Text: software and IT14831457Claude Opus 4.5
LMArena WebDev: React14781631Grok 4.6
LMArena WebDev: HTML15101597Grok 4.6
LMArena WebDev: from an imageNot measured1603Only Grok 4.6 measured
Neither model has a result on the other 7 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.5 and Grok 4.6
BenchmarkClaude Opus 4.5Grok 4.6Leader
AA Intelligence Index29.144.3Grok 4.6
Epoch Capabilities Index150.1156.6Grok 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
Agentic work benchmarks for Claude Opus 4.5 and Grok 4.6
BenchmarkClaude Opus 4.5Grok 4.6Leader
AA Agentic IndexNot measured53.0Only Grok 4.6 measured
Design Arena: agents building web apps11591248Grok 4.6
Design Arena: agents building full-stack apps11561264Grok 4.6
Design Arena: agents building mobile apps11891234Grok 4.6
Design Arena: agents building Android apps11761291Grok 4.6
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
LiveBench researchNot measured84.5%Only Grok 4.6 measured
LiveBench browserNot measured64.0%Only Grok 4.6 measured
LiveBench long agenticNot measured40.7%Only Grok 4.6 measured
Finance Agent (Vals AI)Not measured53.7%Only Grok 4.6 measured
Tax Agent Bench (Vals AI)Not measured33.1%Only Grok 4.6 measured
Legal Research Bench (Vals AI)Not measured48.1%Only Grok 4.6 measured
Excel Modeling Benchmark (Vals AI)Not measured62.7%Only Grok 4.6 measured
BioMysteryBench (Vals AI)Not measured72.2%Only Grok 4.6 measured
Terminal-Bench-Science (Vals AI)Not measured11.4%Only Grok 4.6 measured
Vals Science IndexNot measured38.1%Only Grok 4.6 measured
Time Horizon Index (Vals AI)Not measured5.8%Only Grok 4.6 measured
τ²-Bench Telecom89.5%Not measuredOnly Claude Opus 4.5 measured
APEX-AgentsNot measured65.3%Only Grok 4.6 measured
METR time horizons75.0%Not measuredOnly Claude Opus 4.5 measured
Remote Labor Index3.8%Not measuredOnly Claude Opus 4.5 measured
GDPval45.5%Not measuredOnly Claude Opus 4.5 measured
BALROG43.5%Not measuredOnly Claude Opus 4.5 measured
DeepResearch Bench54.8%Not measuredOnly Claude Opus 4.5 measured
OSWorld66.3%Not measuredOnly Claude Opus 4.5 measured
Vending-Bench 2$4,967$9,047Grok 4.6
Berkeley Function Calling Leaderboard (BFCL)77.5%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index310
Reasoning benchmarks for Claude Opus 4.5 and Grok 4.6
BenchmarkClaude Opus 4.5Grok 4.6Leader
GPQA Diamond85.9%94.7%Grok 4.6
LiveBench reasoningNot measured91.2%Only Grok 4.6 measured
MysteryMechanism (Vals AI)Not measured30.6%Only Grok 4.6 measured
MMMU Pro (Vals AI)83.0%Not measuredOnly Claude Opus 4.5 measured
GPQA Diamond (Artificial Analysis run)86.6%94.9%Grok 4.6
Humanity's Last Exam (Artificial Analysis run)30.1%44.1%Grok 4.6
GPQA Diamond (Epoch AI run)86.0%94.0%Grok 4.6
ARC-AGI80.0%87.5%Grok 4.6
ARC-AGI-237.6%67.1%Grok 4.6
SimpleBench62.0%75.9%Grok 4.6
Chess puzzles14.0%33.0%Grok 4.6
Mystery game puzzles22.0%34.0%Grok 4.6
EBR-bench14.3%30.5%Grok 4.6
VPCT40.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: hard prompts14761448Claude Opus 4.5
LMArena Text: expert14871469Claude Opus 4.5
LMArena Text: hard prompts in English14821445Claude Opus 4.5
LMArena Vision: diagramsNot measured1285Only Grok 4.6 measured
LMArena Vision: homeworkNot measured1283Only Grok 4.6 measured
Kagi LLM Benchmark80.2%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 2 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for Claude Opus 4.5 and Grok 4.6
BenchmarkClaude Opus 4.5Grok 4.6Leader
AIME95.4%Not measuredOnly Claude Opus 4.5 measured
MGSM (Vals AI)95.2%Not measuredOnly Claude Opus 4.5 measured
AA Math Index91.3Not measuredOnly Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)91.3%Not measuredOnly Claude Opus 4.5 measured
OTIS Mock AIME86.1%99.2%Grok 4.6
FrontierMath, tiers 1 to 334.4%66.0%Grok 4.6
FrontierMath, tier 44.9%31.7%Grok 4.6
ProofBench36.0%51.0%Grok 4.6
LMArena Text: math14631417Claude Opus 4.5
LMArena Text: mathematical work14681464Claude Opus 4.5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index74
Knowledge benchmarks for Claude Opus 4.5 and Grok 4.6
BenchmarkClaude Opus 4.5Grok 4.6Leader
MMLU Pro87.3%89.4%Grok 4.6
LegalBench (Vals AI)84.6%86.3%Grok 4.6
CaseLaw (Vals AI)62.6%Not measuredOnly Claude Opus 4.5 measured
CorpFin (Vals AI)65.1%66.2%Grok 4.6
TaxEval (Vals AI)74.9%71.1%Claude Opus 4.5
MortgageTax (Vals AI)68.7%64.2%Claude Opus 4.5
MedQA (Vals AI)95.9%Not measuredOnly Claude Opus 4.5 measured
MedCode (Vals AI)49.2%44.7%Claude Opus 4.5
MMLU Pro (Artificial Analysis run)89.5%Not measuredOnly Claude Opus 4.5 measured
SimpleQA Verified45.7%49.3%Grok 4.6
GeoBench75.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: science14541437Claude Opus 4.5
LMArena Text: medicine and healthcare14441420Claude Opus 4.5
LMArena Text: legal and government14591429Claude Opus 4.5
LMArena Text: business and finance14481416Claude Opus 4.5
FACTS Benchmark Suite43.9%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Claude Opus 4.5 and Grok 4.6
BenchmarkClaude Opus 4.5Grok 4.6Leader
Design Arena: websites12471289Grok 4.6
Design Arena: UI components12351294Grok 4.6
Design Arena: game dev12281296Grok 4.6
Design Arena: data viz12431282Grok 4.6
Design Arena: 3D12131277Grok 4.6
Design Arena: all code categories12421292Grok 4.6
Design Arena: SVG11801240Grok 4.6
Design Arena: ASCII art11901279Grok 4.6
LiveBench designNot measured79.8%Only Grok 4.6 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index186
General benchmarks for Claude Opus 4.5 and Grok 4.6
BenchmarkClaude Opus 4.5Grok 4.6Leader
LiveBench data analysisNot measured75.3%Only Grok 4.6 measured
Public Benefits Bench (Vals AI)Not measured66.8%Only Grok 4.6 measured
SAGE (Vals AI)52.1%28.9%Claude Opus 4.5
MedScribe (Vals AI)85.3%86.5%Grok 4.6
IFBench58.0%Not measuredOnly Claude Opus 4.5 measured
Long context reasoning (AA-LCR)77.3%81.0%Grok 4.6
DTBench89.9%97.3%Grok 4.6
LMCA44.5%48.5%Grok 4.6
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Furniture assembly28.3%40.0%Grok 4.6
LMArena Text14511429Claude Opus 4.5
LMArena Text: instruction following14781431Claude Opus 4.5
LMArena Text: creative writing14451426Claude Opus 4.5
LMArena VisionNot measured1263Only Grok 4.6 measured
LMArena Text: English14611433Claude Opus 4.5
LMArena Text: non-English14381420Claude Opus 4.5
LMArena Text: Chinese14701476Grok 4.6
LMArena Text: German14491426Claude Opus 4.5
LMArena Text: Japanese14171378Claude Opus 4.5
LMArena Text: Korean14241391Claude Opus 4.5
LMArena Text: French14711455Claude Opus 4.5
LMArena Text: Spanish14571414Claude Opus 4.5
LMArena Text: Russian14471421Claude Opus 4.5
LMArena Text: Polish14391430Claude Opus 4.5
LMArena Text: multi-turn14661425Claude Opus 4.5
LMArena Text: longer queries14791456Claude Opus 4.5
LMArena Text: writing and language14521429Claude Opus 4.5
LMArena Text: entertainment and media14341421Claude Opus 4.5
LMArena Vision: EnglishNot measured1270Only Grok 4.6 measured
LMArena Vision: ChineseNot measured1289Only Grok 4.6 measured
LMArena Vision: reading textNot measured1272Only Grok 4.6 measured
LMArena Vision: humorNot measured1270Only Grok 4.6 measured
LMArena Vision: creative writingNot measured1262Only Grok 4.6 measured
LMArena Document14621452Claude Opus 4.5
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.5 and Grok 4.6
BenchmarkClaude Opus 4.5Grok 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 4.5$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 4.5$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 4.5$1.25Exceeds the context window
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 4.5 and Grok 4.6
SpecificationAnthropic Claude Opus 4.5SpaceXAI Grok 4.6
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 24, 2025August 12, 2026
Context window200K500K
Input $/Mtok$5.00$2.00
Output $/Mtok$25.00$6.00
Coding index44.065.7
Independent measurements behind it36
Cost per solved task$1.37$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than Grok 4.6 for coding?

Pick Grok 4.6 for coding: it scores 65.7 on the Vibe Coding Index against 44.0 for Claude Opus 4.5. Pick Claude Opus 4.5 for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, Claude Opus 4.5 or Grok 4.6?

Claude Opus 4.5 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 4.5 costs $1.37 and Grok 4.6 $0.82.

Which has the bigger context window, Claude Opus 4.5 or Grok 4.6?

Grok 4.6, with 500K tokens against 200K.

How many benchmarks is the Claude Opus 4.5 vs Grok 4.6 comparison based on?

78 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.5's coding index rests on 3 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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