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Claude Opus 4.6 vs Grok 4.5

Grok 4.5 leads Claude Opus 4.6 on coding, 58.6 to 57.2 on the Vibe Coding Index, and Grok 4.5 costs 4.2x less per output token ($6.00 vs $25.00 per million). Updated October 22, 2026; 91 benchmarks have a result for both.

Replace Claude Opus 4.6 Replace Grok 4.5
Claude Opus 4.6Anthropic
Coding
57.2
Overall
66.0
Output $/M
$25.00
60
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
31
vs boards won of 91 shared

Claude Opus 4.6 or Grok 4.5: which to pick

Claude Opus 4.6 and Grok 4.5 are level for coding, 57.2 against 58.6 on the Vibe Coding Index, so price and context decide.

Pick Claude Opus 4.6 for a larger context window (1M against 500K tokens) and work measured by WeirdML or LMArena Text: coding, where it leads. Pick Grok 4.5 for output tokens 4.2x cheaper ($6.00 vs $25.00 per million) and a lower cost per solved task ($0.62 against $1.56).

Model AClaude Opus 4.6Anthropic57.2/1004 independent benchmarks$1.56 per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
91
Claude Opus 4.6 only
19
Grok 4.5 only
32
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 4.6 57.2 from 4 benchmarks, Grok 4.5 58.6 from 6 benchmarks.
Widest category
Coding, 9.7 points apart on average over 11 shared benchmarks.
Widest single gap
WeirdML: Claude Opus 4.6 78.0% against Grok 4.5 46.4%, 31.5 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against Grok 4.5 $6.00 per million output tokens, 4.2x apart.
Context window
Claude Opus 4.6 takes 1M 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 4.6BarsGrok 4.5Ties
Coding38
Intelligence11
Agentic work16
Reasoning96
Math51
Knowledge75
Web design71
General273
All shared boards6031
CodingLike-for-likeSix of these boards feed the Vibe Coding Index38
Coding benchmarks for Claude Opus 4.6 and Grok 4.5
BenchmarkClaude Opus 4.6Grok 4.5Leader
SWE-bench Verified75.6%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LiveBench codingNot measured94.3%Only Grok 4.5 measured
LMArena WebDev15471553Grok 4.5
AA Coding IndexNot measured72.4Only Grok 4.5 measured
LiveCodeBench (Vals AI)84.7%87.3%Grok 4.5
SWE-bench Verified (Vals AI)78.2%86.6%Grok 4.5
Terminal-Bench 4 (Vals AI)Not measured8.6%Only Grok 4.5 measured
Vibe Code Bench (Vals AI)57.6%69.0%Grok 4.5
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-Bench Hard (Artificial Analysis run)48.5%Not measuredOnly Claude Opus 4.6 measured
Terminal-Bench79.8%Not measuredOnly Claude Opus 4.6 measured
FrontierCode26.6%42.4%Grok 4.5
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%46.4%Claude Opus 4.6
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
ALE-BenchNot measured1309.3Only Grok 4.5 measured
LMArena Text: coding15341474Claude Opus 4.6
LMArena Text: software and IT15271471Claude Opus 4.6
LMArena WebDev: React15391556Grok 4.5
LMArena WebDev: HTML15591567Grok 4.5
LMArena WebDev: from an image15431562Grok 4.5
SciCodeNot measured6.5%Only Grok 4.5 measured
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for Claude Opus 4.6 and Grok 4.5
BenchmarkClaude Opus 4.6Grok 4.5Leader
AA Intelligence Index31.938.8Grok 4.5
Epoch Capabilities Index155.7154.1Claude Opus 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index16
Agentic work benchmarks for Claude Opus 4.6 and Grok 4.5
BenchmarkClaude Opus 4.6Grok 4.5Leader
AA Agentic IndexNot measured41.2Only Grok 4.5 measured
Design Arena: agents building web apps12061218Grok 4.5
Design Arena: agents building full-stack apps12201249Grok 4.5
Design Arena: agents building mobile apps12071220Grok 4.5
Design Arena: agents building Android apps11971236Grok 4.5
Design Arena: agents building Godot gamesNot measured1229Only Grok 4.5 measured
Design Arena: agents building games12121236Grok 4.5
Design Arena: HTML slidesNot measured1205Only Grok 4.5 measured
Design Arena: PowerPoint slidesNot measured1230Only 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
τ²-Bench Telecom92.1%Not measuredOnly Claude Opus 4.6 measured
APEX-Agents46.3%56.2%Grok 4.5
METR time horizons78.9%Not measuredOnly Claude Opus 4.6 measured
Remote Labor Index4.2%Not measuredOnly Claude Opus 4.6 measured
DeepResearch Bench55.3%Not measuredOnly Claude Opus 4.6 measured
PostTrainBenchNot measured23.4%Only Grok 4.5 measured
Vending-Bench 2$8,018$3,887Claude Opus 4.6
LMArena SearchNot measured1216Only Grok 4.5 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index96
Reasoning benchmarks for Claude Opus 4.6 and Grok 4.5
BenchmarkClaude Opus 4.6Grok 4.5Leader
GPQA Diamond89.7%92.9%Grok 4.5
LiveBench reasoningNot measured87.2%Only Grok 4.5 measured
MMMU Pro (Vals AI)83.9%61.8%Claude Opus 4.6
GPQA Diamond (Artificial Analysis run)89.6%93.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)39.9%42.7%Grok 4.5
GPQA Diamond (Epoch AI run)90.5%93.4%Grok 4.5
ARC-AGI94.0%87.2%Claude Opus 4.6
ARC-AGI-269.2%52.6%Claude Opus 4.6
SimpleBench67.6%70.0%Grok 4.5
Chess puzzles21.0%35.0%Grok 4.5
Mystery game puzzles25.0%Not measuredOnly Claude Opus 4.6 measured
EBR-bench12.7%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts15251462Claude Opus 4.6
LMArena Text: expert15441465Claude Opus 4.6
LMArena Text: hard prompts in English15301464Claude Opus 4.6
LMArena Vision: diagrams13401304Claude Opus 4.6
LMArena Vision: homework13371295Claude Opus 4.6
Kagi LLM Benchmark83.6%83.5%Claude Opus 4.6
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index51
Math benchmarks for Claude Opus 4.6 and Grok 4.5
BenchmarkClaude Opus 4.6Grok 4.5Leader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
OTIS Mock AIME94.4%97.8%Grok 4.5
FrontierMath, tiers 1 to 366.0%57.2%Claude Opus 4.6
FrontierMath, tier 426.8%24.4%Claude Opus 4.6
ProofBench50.0%31.0%Claude Opus 4.6
LMArena Text: math15181460Claude Opus 4.6
LMArena Text: mathematical work15251482Claude Opus 4.6
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index75
Knowledge benchmarks for Claude Opus 4.6 and Grok 4.5
BenchmarkClaude Opus 4.6Grok 4.5Leader
MMLU Pro89.1%89.2%Grok 4.5
LegalBench (Vals AI)85.3%86.0%Grok 4.5
CaseLaw (Vals AI)62.1%Not measuredOnly Claude Opus 4.6 measured
CorpFin (Vals AI)67.0%67.4%Grok 4.5
TaxEval (Vals AI)76.0%71.7%Claude Opus 4.6
MortgageTax (Vals AI)68.5%61.8%Claude Opus 4.6
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%43.3%Claude Opus 4.6
SimpleQA Verified47.0%48.3%Grok 4.5
LMArena Text: science15191464Claude Opus 4.6
LMArena Text: medicine and healthcare15041440Claude Opus 4.6
LMArena Text: legal and government15121463Claude Opus 4.6
LMArena Text: business and finance14971441Claude Opus 4.6
FACTS Benchmark Suite41.5%50.2%Grok 4.5
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index71
Web design benchmarks for Claude Opus 4.6 and Grok 4.5
BenchmarkClaude Opus 4.6Grok 4.5Leader
Design Arena: websites12911281Claude Opus 4.6
Design Arena: UI components12811280Claude Opus 4.6
Design Arena: game dev12771264Claude Opus 4.6
Design Arena: data viz12791266Claude Opus 4.6
Design Arena: 3D12731257Claude Opus 4.6
Design Arena: all code categories12881275Claude Opus 4.6
Design Arena: SVG12271215Claude Opus 4.6
Design Arena: ASCII art12551256Grok 4.5
LiveBench designNot measured78.1%Only Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index273
General benchmarks for Claude Opus 4.6 and Grok 4.5
BenchmarkClaude Opus 4.6Grok 4.5Leader
LiveBench data analysisNot measured73.0%Only Grok 4.5 measured
SAGE (Vals AI)51.6%35.0%Claude Opus 4.6
MedScribe (Vals AI)86.7%86.9%Grok 4.5
Vals Multimodal IndexNot measured63.4%Only Grok 4.5 measured
IFBench53.1%Not measuredOnly Claude Opus 4.6 measured
Long context reasoning (AA-LCR)78.0%79.3%Grok 4.5
DTBench91.2%96.5%Grok 4.5
LMCA55.8%45.2%Claude Opus 4.6
CL-bench20.7%Not measuredOnly Claude Opus 4.6 measured
Surface Evolver BenchNot measured74.4%Only Grok 4.5 measured
Furniture assembly28.3%22.5%Claude Opus 4.6
CL-bench Life17.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text15011448Claude Opus 4.6
LMArena Text: instruction following15211445Claude Opus 4.6
LMArena Text: creative writing15051442Claude Opus 4.6
LMArena Vision13161287Claude Opus 4.6
LMArena Text: English15111453Claude Opus 4.6
LMArena Text: non-English14881440Claude Opus 4.6
LMArena Text: Chinese15511495Claude Opus 4.6
LMArena Text: German15001448Claude Opus 4.6
LMArena Text: Japanese14881430Claude Opus 4.6
LMArena Text: Korean14641406Claude Opus 4.6
LMArena Text: French15121457Claude Opus 4.6
LMArena Text: Spanish15101451Claude Opus 4.6
LMArena Text: Russian14971449Claude Opus 4.6
LMArena Text: Polish14991432Claude Opus 4.6
LMArena Text: multi-turn15111456Claude Opus 4.6
LMArena Text: longer queries15181462Claude Opus 4.6
LMArena Text: writing and language15021445Claude Opus 4.6
LMArena Text: entertainment and media14921434Claude Opus 4.6
LMArena Vision: English13241285Claude Opus 4.6
LMArena Vision: Chinese13701345Claude Opus 4.6
LMArena Vision: reading text13261293Claude Opus 4.6
LMArena Vision: humor13141276Claude Opus 4.6
LMArena Vision: recognizing things1274Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: creative writing13311293Claude Opus 4.6
LMArena Document15071452Claude Opus 4.6
Neither model has a result on the other 9 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.6 and Grok 4.5
BenchmarkClaude Opus 4.6Grok 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 4.6$0.018Fits 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 4.6$0.325Fits 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 4.6$1.25Fits in one request
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 4.6 and Grok 4.5
SpecificationAnthropic Claude Opus 4.6SpaceXAI Grok 4.5
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 4, 2026July 8, 2026
Context window1M500K
Input $/Mtok$5.00$2.00
Output $/Mtok$25.00$6.00
Coding index57.258.6
Independent measurements behind it46
Cost per solved task$1.56$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than Grok 4.5 for coding?

Claude Opus 4.6 and Grok 4.5 are level for coding, 57.2 against 58.6 on the Vibe Coding Index, so price and context decide. Pick Claude Opus 4.6 for a larger context window (1M against 500K tokens) and work measured by WeirdML or LMArena Text: coding, where it leads. Pick Grok 4.5 for output tokens 4.2x cheaper ($6.00 vs $25.00 per million) and a lower cost per solved task ($0.62 against $1.56).

Which is cheaper, Claude Opus 4.6 or Grok 4.5?

Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Per solved SWE-bench Verified task, Claude Opus 4.6 costs $1.56 and Grok 4.5 $0.62.

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

Claude Opus 4.6, with 1M tokens against 500K.

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

91 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.6's coding index rests on 4 independent benchmarks 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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