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Claude Opus 4.1 vs Grok 4.5

Grok 4.5 leads Claude Opus 4.1 on the Artificial Analysis Intelligence Index, 38.8 to 22.8, and Grok 4.5 costs 12.5x less per output token ($6.00 vs $75.00 per million). Updated October 21, 2026; 60 benchmarks have a result for both.

Replace Claude Opus 4.1 Replace Grok 4.5
Claude Opus 4.1Anthropic
Coding
No data
Overall
50.2
Output $/M
$75.00
4
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
56
vs boards won of 60 shared

Claude Opus 4.1 or Grok 4.5: which to pick

Only Grok 4.5 has a coding score, 58.6 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding.

Pick Claude Opus 4.1 for work measured by LMArena Text: coding or MMMU Pro (Vals AI), where it leads.

Model AClaude Opus 4.1AnthropicNot benchmarked1 independent benchmarkNo cost per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
60
Claude Opus 4.1 only
13
Grok 4.5 only
63
Like-for-like categories
7 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 4.1 not benchmarked, Grok 4.5 58.6 from 6 benchmarks.
Widest category
Math, 21.6 points apart on average over 5 shared benchmarks.
Widest single gap
FrontierMath, tiers 1 to 3: Claude Opus 4.1 12.6% against Grok 4.5 57.2%, 44.6 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.1 $75.00 against Grok 4.5 $6.00 per million output tokens, 12.5x apart.
Context window
Claude Opus 4.1 takes 200K tokens, Grok 4.5 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 4.1BarsGrok 4.5Ties
Coding16
Intelligence02
Reasoning16
Math05
Knowledge28
Web design08
General021
All shared boards456
CodingLike-for-likeSix of these boards feed the Vibe Coding Index16
Coding benchmarks for Claude Opus 4.1 and Grok 4.5
BenchmarkClaude Opus 4.1Grok 4.5Leader
LiveBench codingNot measured94.3%Only Grok 4.5 measured
LMArena WebDev13901553Grok 4.5
AA Coding IndexNot measured72.4Only Grok 4.5 measured
LiveCodeBench (Vals AI)66.5%87.3%Grok 4.5
SWE-bench Verified (Vals AI)Not measured86.6%Only Grok 4.5 measured
Terminal-Bench 4 (Vals AI)Not measured8.6%Only Grok 4.5 measured
Vibe Code Bench (Vals AI)Not measured69.0%Only Grok 4.5 measured
Code migration (Vals AI)Not measured36.6%Only Grok 4.5 measured
ProgramBench (Vals AI)Not measured0.0%Only Grok 4.5 measured
IOI (Vals AI)Not measured40.6%Only Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)Not measured67.8%Only Grok 4.5 measured
SkillsBench (Vals AI)Not measured66.0%Only Grok 4.5 measured
CyberBench (Vals AI)Not measured71.0%Only Grok 4.5 measured
SciCodeNot measured55.0%Only Grok 4.5 measured
Terminal-Bench38.0%Not measuredOnly Claude Opus 4.1 measured
FrontierCodeNot measured42.4%Only Grok 4.5 measured
WeirdML45.9%46.4%Grok 4.5
Cybench42.0%Not measuredOnly Claude Opus 4.1 measured
ALE-BenchNot measured1309.3Only Grok 4.5 measured
LMArena Text: coding14791474Claude Opus 4.1
LMArena Text: software and IT14561471Grok 4.5
LMArena WebDev: ReactNot measured1556Only Grok 4.5 measured
LMArena WebDev: HTML13991567Grok 4.5
LMArena WebDev: from an imageNot measured1562Only Grok 4.5 measured
SciCode4.6%6.5%Grok 4.5
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.1 and Grok 4.5
BenchmarkClaude Opus 4.1Grok 4.5Leader
AA Intelligence Index22.838.8Grok 4.5
Epoch Capabilities Index144.1154.1Grok 4.5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index25 boards, none shared
Agentic work benchmarks for Claude Opus 4.1 and Grok 4.5
BenchmarkClaude Opus 4.1Grok 4.5Leader
AA Agentic IndexNot measured41.2Only Grok 4.5 measured
Design Arena: agents building web appsNot measured1218Only Grok 4.5 measured
Design Arena: agents building full-stack appsNot measured1249Only Grok 4.5 measured
Design Arena: agents building mobile appsNot measured1221Only Grok 4.5 measured
Design Arena: agents building Android appsNot measured1242Only Grok 4.5 measured
Design Arena: agents building Godot gamesNot measured1229Only Grok 4.5 measured
Design Arena: agents building gamesNot measured1236Only Grok 4.5 measured
Design Arena: HTML slidesNot measured1204Only Grok 4.5 measured
Design Arena: PowerPoint slidesNot measured1233Only Grok 4.5 measured
LiveBench researchNot measured85.9%Only Grok 4.5 measured
LiveBench browserNot measured44.0%Only Grok 4.5 measured
LiveBench long agenticNot measured27.9%Only Grok 4.5 measured
SREBench (Vals AI)Not measured0.8%Only Grok 4.5 measured
Finance Agent (Vals AI)Not measured48.4%Only Grok 4.5 measured
Tax Agent Bench (Vals AI)Not measured24.9%Only Grok 4.5 measured
Legal Research Bench (Vals AI)Not measured38.0%Only Grok 4.5 measured
Excel Modeling Benchmark (Vals AI)Not measured52.9%Only Grok 4.5 measured
Time Horizon Index (Vals AI)Not measured6.3%Only Grok 4.5 measured
APEX-AgentsNot measured56.2%Only Grok 4.5 measured
METR time horizons66.8%Not measuredOnly Claude Opus 4.1 measured
GDPval43.6%Not measuredOnly Claude Opus 4.1 measured
DeepResearch Bench48.3%Not measuredOnly Claude Opus 4.1 measured
PostTrainBenchNot measured23.4%Only Grok 4.5 measured
Vending-Bench 2Not measured$3,887Only Grok 4.5 measured
LMArena SearchNot measured1216Only Grok 4.5 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index16
Reasoning benchmarks for Claude Opus 4.1 and Grok 4.5
BenchmarkClaude Opus 4.1Grok 4.5Leader
GPQA Diamond76.3%92.9%Grok 4.5
LiveBench reasoningNot measured87.2%Only Grok 4.5 measured
MMMU Pro (Vals AI)77.5%61.8%Claude Opus 4.1
GPQA Diamond (Artificial Analysis run)Not measured93.1%Only Grok 4.5 measured
Humanity's Last Exam (Artificial Analysis run)Not measured42.7%Only Grok 4.5 measured
GPQA Diamond (Epoch AI run)77.3%93.4%Grok 4.5
ARC-AGINot measured87.2%Only Grok 4.5 measured
ARC-AGI-2Not measured52.6%Only Grok 4.5 measured
SimpleBench60.0%70.0%Grok 4.5
Chess puzzlesNot measured35.0%Only Grok 4.5 measured
Mystery game puzzles21.0%Not measuredOnly Claude Opus 4.1 measured
EBR-bench7.9%Not measuredOnly Claude Opus 4.1 measured
VPCT35.0%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: hard prompts14421462Grok 4.5
LMArena Text: expert14381465Grok 4.5
LMArena Text: hard prompts in English14511464Grok 4.5
LMArena Vision: diagramsNot measured1304Only Grok 4.5 measured
LMArena Vision: homeworkNot measured1295Only Grok 4.5 measured
Kagi LLM BenchmarkNot measured83.5%Only Grok 4.5 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index05
Math benchmarks for Claude Opus 4.1 and Grok 4.5
BenchmarkClaude Opus 4.1Grok 4.5Leader
AIME78.2%Not measuredOnly Claude Opus 4.1 measured
MATH 500 (Vals AI)95.4%Not measuredOnly Claude Opus 4.1 measured
MGSM (Vals AI)94.4%Not measuredOnly Claude Opus 4.1 measured
OTIS Mock AIME68.9%97.8%Grok 4.5
FrontierMath, tiers 1 to 312.6%57.2%Grok 4.5
FrontierMath, tier 42.4%24.4%Grok 4.5
ProofBenchNot measured31.0%Only Grok 4.5 measured
LMArena Text: math14311460Grok 4.5
LMArena Text: mathematical work14341482Grok 4.5
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index28
Knowledge benchmarks for Claude Opus 4.1 and Grok 4.5
BenchmarkClaude Opus 4.1Grok 4.5Leader
MMLU Pro87.9%89.2%Grok 4.5
LegalBench (Vals AI)83.5%86.0%Grok 4.5
CorpFin (Vals AI)Not measured67.4%Only Grok 4.5 measured
TaxEval (Vals AI)73.7%71.7%Claude Opus 4.1
MortgageTax (Vals AI)61.1%61.8%Grok 4.5
MedQA (Vals AI)93.6%Not measuredOnly Claude Opus 4.1 measured
MedCode (Vals AI)47.2%43.3%Claude Opus 4.1
SimpleQA VerifiedNot measured48.3%Only Grok 4.5 measured
LMArena Text: science14221464Grok 4.5
LMArena Text: medicine and healthcare14161440Grok 4.5
LMArena Text: legal and government14211463Grok 4.5
LMArena Text: business and finance14061441Grok 4.5
FACTS Benchmark Suite40.4%50.2%Grok 4.5
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Claude Opus 4.1 and Grok 4.5
BenchmarkClaude Opus 4.1Grok 4.5Leader
Design Arena: websites11771281Grok 4.5
Design Arena: UI components11651279Grok 4.5
Design Arena: game dev11711263Grok 4.5
Design Arena: data viz11661266Grok 4.5
Design Arena: 3D11531257Grok 4.5
Design Arena: all code categories11711275Grok 4.5
Design Arena: SVG11521215Grok 4.5
Design Arena: ASCII art11671257Grok 4.5
LiveBench designNot measured78.1%Only Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index021
General benchmarks for Claude Opus 4.1 and Grok 4.5
BenchmarkClaude Opus 4.1Grok 4.5Leader
LiveBench data analysisNot measured73.0%Only Grok 4.5 measured
SAGE (Vals AI)31.4%35.0%Grok 4.5
MedScribe (Vals AI)73.9%86.9%Grok 4.5
Vals Multimodal IndexNot measured63.4%Only Grok 4.5 measured
Long context reasoning (AA-LCR)Not measured79.3%Only Grok 4.5 measured
DTBench80.0%96.5%Grok 4.5
LMCA37.1%45.2%Grok 4.5
Creative writing (Lech Mazur)84.7%Not measuredOnly Claude Opus 4.1 measured
Surface Evolver BenchNot measured74.4%Only Grok 4.5 measured
Furniture assemblyNot measured22.5%Only Grok 4.5 measured
LMArena Text14191448Grok 4.5
LMArena Text: instruction following14351445Grok 4.5
LMArena Text: creative writing14121442Grok 4.5
LMArena VisionNot measured1287Only Grok 4.5 measured
LMArena Text: English14331453Grok 4.5
LMArena Text: non-English14051440Grok 4.5
LMArena Text: Chinese14271495Grok 4.5
LMArena Text: German14131448Grok 4.5
LMArena Text: Japanese13771430Grok 4.5
LMArena Text: Korean13811406Grok 4.5
LMArena Text: French14331457Grok 4.5
LMArena Text: Spanish14481451Grok 4.5
LMArena Text: Russian14221449Grok 4.5
LMArena Text: Polish14131432Grok 4.5
LMArena Text: multi-turn14441456Grok 4.5
LMArena Text: longer queries14551462Grok 4.5
LMArena Text: writing and language14181445Grok 4.5
LMArena Text: entertainment and media13981434Grok 4.5
LMArena Vision: EnglishNot measured1285Only Grok 4.5 measured
LMArena Vision: ChineseNot measured1345Only Grok 4.5 measured
LMArena Vision: reading textNot measured1293Only Grok 4.5 measured
LMArena Vision: humorNot measured1276Only Grok 4.5 measured
LMArena Vision: creative writingNot measured1293Only Grok 4.5 measured
LMArena DocumentNot measured1452Only Grok 4.5 measured
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 4.1 and Grok 4.5
BenchmarkClaude Opus 4.1Grok 4.5Leader
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 4.1$0.052Fits in one request
Grok 4.5$0.0050Fits in one request

Grok 4.5 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.1$0.975Fits in one request
Grok 4.5$0.118Fits in one request

Grok 4.5 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.1$3.75Exceeds the context window
Grok 4.5$0.460Fits in one request

Grok 4.5 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 4.1 and Grok 4.5
SpecificationAnthropic Claude Opus 4.1SpaceXAI Grok 4.5
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedAugust 5, 2025July 8, 2026
Context window200K500K
Input $/Mtok$15.00$2.00
Output $/Mtok$75.00$6.00
Coding indexNot benchmarked58.6
Independent measurements behind it16
Cost per solved taskNot computable$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.1 better than Grok 4.5 for coding?

Only Grok 4.5 has a coding score, 58.6 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding. Pick Claude Opus 4.1 for work measured by LMArena Text: coding or MMMU Pro (Vals AI), where it leads.

Which is cheaper, Claude Opus 4.1 or Grok 4.5?

Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Cost per solved task is known for Grok 4.5 only.

Which has the bigger context window, Claude Opus 4.1 or Grok 4.5?

Grok 4.5, with 500K tokens against 200K.

How many benchmarks is the Claude Opus 4.1 vs Grok 4.5 comparison based on?

60 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and Grok 4.5's on 6. Where only one model has a result, the page says so instead of naming a winner.

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