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Claude Opus 4.8 vs Grok 4.6

Grok 4.6 leads Claude Opus 4.8 on coding, 65.7 to 65.0 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; 114 benchmarks have a result for both.

Replace Claude Opus 4.8 Replace Grok 4.6
Claude Opus 4.8Anthropic
Coding
65.0
Overall
69.8
Output $/M
$25.00
67
Grok 4.6xAI
Coding
65.7
Overall
67.4
Output $/M
$6.00
46
vs boards won of 114 shared, 1 tied

Claude Opus 4.8 or Grok 4.6: which to pick

Claude Opus 4.8 and Grok 4.6 are level for coding, 65.0 against 65.7 on the Vibe Coding Index, so price and context decide.

Pick Claude Opus 4.8 for a larger context window (1M against 500K tokens) and work measured by Terminal-Bench 4 (Vals AI) or Vibe Code Bench (Vals AI), where it leads. Pick Grok 4.6 for output tokens 4.2x cheaper ($6.00 vs $25.00 per million) and a lower cost per solved task ($0.82 against $2.17).

Model AClaude Opus 4.8Anthropic65.0/1006 independent benchmarks$2.17 per solved taskModel BGrok 4.6xAI65.7/1006 independent benchmarks$0.82 per solved task
Shared results
114
Claude Opus 4.8 only
16
Grok 4.6 only
9
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 4.8 65.0 from 6 benchmarks, Grok 4.6 65.7 from 6 benchmarks.
Widest category
Math, 12.4 points apart on average over 6 shared benchmarks.
Widest single gap
LiveBench browser: Claude Opus 4.8 96.0% against Grok 4.6 64.0%, 32.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.8 $25.00 against Grok 4.6 $6.00 per million output tokens, 4.2x apart.
Context window
Claude Opus 4.8 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 4.8BarsGrok 4.6Ties
Coding7101 tie
Intelligence11
Agentic work614
Reasoning106
Math51
Knowledge101
Web design09
General284
All shared boards67461 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index710
Coding benchmarks for Claude Opus 4.8 and Grok 4.6
BenchmarkClaude Opus 4.8Grok 4.6Leader
LiveBench coding77.3%89.1%Grok 4.6
LMArena WebDev15561617Grok 4.6
AA Coding Index74.376.8Grok 4.6
LiveCodeBench (Vals AI)87.8%88.2%Grok 4.6
SWE-bench Verified (Vals AI)88.6%95.6%Grok 4.6
Terminal-Bench 4 (Vals AI)23.2%17.2%Claude Opus 4.8
Vibe Code Bench (Vals AI)82.7%76.2%Claude Opus 4.8
Code migration (Vals AI)47.3%44.6%Claude Opus 4.8
ProgramBench (Vals AI)1.0%1.0%Tie
IOI (Vals AI)Not measured47.6%Only Grok 4.6 measured
Terminal-Bench 2.1 (Vals AI)71.9%78.3%Grok 4.6
Vibe Code Bench 1-100 (Vals AI)Not measured14.8%Only Grok 4.6 measured
SkillsBench (Vals AI)59.2%55.8%Claude Opus 4.8
CyberBench (Vals AI)Not measured67.7%Only Grok 4.6 measured
SciCode54.4%56.5%Grok 4.6
Terminal-Bench Hard (Artificial Analysis run)58.3%Not measuredOnly Claude Opus 4.8 measured
FrontierCode46.5%48.0%Grok 4.6
FrontierSWENot measured25.3%Only Grok 4.6 measured
GSO-Bench47.1%Not measuredOnly Claude Opus 4.8 measured
WeirdML82.9%67.3%Claude Opus 4.8
ALE-BenchNot measured1508.1Only Grok 4.6 measured
LMArena Text: coding14901466Claude Opus 4.8
LMArena Text: software and IT14881457Claude Opus 4.8
LMArena WebDev: React15571631Grok 4.6
LMArena WebDev: HTML15431597Grok 4.6
LMArena WebDev: from an imageNot measured1603Only Grok 4.6 measured
SciCode12.3%Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for Claude Opus 4.8 and Grok 4.6
BenchmarkClaude Opus 4.8Grok 4.6Leader
AA Intelligence Index41.844.3Grok 4.6
Epoch Capabilities Index159.0156.6Claude Opus 4.8
Agentic workLike-for-likePublic boards, shown as published, kept out of the index614
Agentic work benchmarks for Claude Opus 4.8 and Grok 4.6
BenchmarkClaude Opus 4.8Grok 4.6Leader
AA Agentic Index41.953.0Grok 4.6
Design Arena: agents building web apps12331248Grok 4.6
Design Arena: agents building full-stack apps12491264Grok 4.6
Design Arena: agents building mobile apps12221234Grok 4.6
Design Arena: agents building Android apps12331291Grok 4.6
Design Arena: agents building Godot games12311276Grok 4.6
Design Arena: agents building games12391209Claude Opus 4.8
Design Arena: HTML slides11711250Grok 4.6
Design Arena: PowerPoint slides12021237Grok 4.6
Design Arena: spreadsheets1303Not measuredOnly Claude Opus 4.8 measured
LiveBench research81.8%84.5%Grok 4.6
LiveBench browser96.0%64.0%Claude Opus 4.8
LiveBench long agentic48.3%40.7%Claude Opus 4.8
Finance Agent (Vals AI)53.9%53.7%Claude Opus 4.8
Tax Agent Bench (Vals AI)30.0%33.1%Grok 4.6
Legal Research Bench (Vals AI)43.8%48.1%Grok 4.6
Excel Modeling Benchmark (Vals AI)69.4%62.7%Claude Opus 4.8
BioMysteryBench (Vals AI)Not measured72.2%Only Grok 4.6 measured
Terminal-Bench-Science (Vals AI)4.3%11.4%Grok 4.6
Vals Science IndexNot measured38.1%Only Grok 4.6 measured
Time Horizon Index (Vals AI)11.8%5.8%Claude Opus 4.8
τ²-Bench Telecom94.4%Not measuredOnly Claude Opus 4.8 measured
APEX-Agents48.9%65.3%Grok 4.6
Remote Labor Index8.3%Not measuredOnly Claude Opus 4.8 measured
OSWorld 2.020.6%Not measuredOnly Claude Opus 4.8 measured
DeepResearch Bench50.2%Not measuredOnly Claude Opus 4.8 measured
PostTrainBench33.8%Not measuredOnly Claude Opus 4.8 measured
Vending-Bench 2$5,787$9,047Grok 4.6
LMArena Search1204Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index106
Reasoning benchmarks for Claude Opus 4.8 and Grok 4.6
BenchmarkClaude Opus 4.8Grok 4.6Leader
GPQA Diamond92.4%94.7%Grok 4.6
LiveBench reasoning89.2%91.2%Grok 4.6
MysteryMechanism (Vals AI)Not measured30.6%Only Grok 4.6 measured
MMMU Pro (Vals AI)86.6%Not measuredOnly Claude Opus 4.8 measured
GPQA Diamond (Artificial Analysis run)92.0%94.9%Grok 4.6
Humanity's Last Exam (Artificial Analysis run)48.7%44.1%Claude Opus 4.8
GPQA Diamond (Epoch AI run)91.0%94.0%Grok 4.6
ARC-AGI92.5%87.5%Claude Opus 4.8
ARC-AGI-272.1%67.1%Claude Opus 4.8
SimpleBench64.8%75.9%Grok 4.6
Chess puzzles52.0%33.0%Claude Opus 4.8
Mystery game puzzles36.0%34.0%Claude Opus 4.8
EBR-bench28.6%30.5%Grok 4.6
LMArena Text: hard prompts14821448Claude Opus 4.8
LMArena Text: expert15031469Claude Opus 4.8
LMArena Text: hard prompts in English14871445Claude Opus 4.8
LMArena Vision: diagrams13151285Claude Opus 4.8
LMArena Vision: homework13371283Claude Opus 4.8
Kagi LLM Benchmark88.8%Not measuredOnly Claude Opus 4.8 measured
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 4.8 and Grok 4.6
BenchmarkClaude Opus 4.8Grok 4.6Leader
OTIS Mock AIME98.3%99.2%Grok 4.6
FrontierMath, tiers 1 to 380.0%66.0%Claude Opus 4.8
FrontierMath, tier 456.1%31.7%Claude Opus 4.8
ProofBench69.0%51.0%Claude Opus 4.8
LMArena Text: math14861417Claude Opus 4.8
LMArena Text: mathematical work14971464Claude Opus 4.8
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index101
Knowledge benchmarks for Claude Opus 4.8 and Grok 4.6
BenchmarkClaude Opus 4.8Grok 4.6Leader
MMLU Pro89.6%89.4%Claude Opus 4.8
LegalBench (Vals AI)83.6%86.3%Grok 4.6
CorpFin (Vals AI)66.7%66.2%Claude Opus 4.8
TaxEval (Vals AI)75.6%71.1%Claude Opus 4.8
MortgageTax (Vals AI)69.9%64.2%Claude Opus 4.8
MedCode (Vals AI)53.2%44.7%Claude Opus 4.8
SimpleQA Verified53.0%49.3%Claude Opus 4.8
LMArena Text: science14771437Claude Opus 4.8
LMArena Text: medicine and healthcare14641420Claude Opus 4.8
LMArena Text: legal and government14771429Claude Opus 4.8
LMArena Text: business and finance14581416Claude Opus 4.8
FACTS Benchmark Suite53.5%Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index09
Web design benchmarks for Claude Opus 4.8 and Grok 4.6
BenchmarkClaude Opus 4.8Grok 4.6Leader
Design Arena: websites12581289Grok 4.6
Design Arena: UI components12551294Grok 4.6
Design Arena: game dev12641296Grok 4.6
Design Arena: data viz12401282Grok 4.6
Design Arena: 3D12221277Grok 4.6
Design Arena: all code categories12551292Grok 4.6
Design Arena: SVG11951240Grok 4.6
Design Arena: ASCII art12771279Grok 4.6
LiveBench design78.8%79.8%Grok 4.6
GeneralLike-for-likePublic boards, shown as published, kept out of the index284
General benchmarks for Claude Opus 4.8 and Grok 4.6
BenchmarkClaude Opus 4.8Grok 4.6Leader
LiveBench data analysis66.0%75.3%Grok 4.6
Public Benefits Bench (Vals AI)68.1%66.8%Claude Opus 4.8
SAGE (Vals AI)54.8%28.9%Claude Opus 4.8
MedScribe (Vals AI)85.8%86.5%Grok 4.6
Vals Multimodal Index70.9%Not measuredOnly Claude Opus 4.8 measured
IFBench62.2%Not measuredOnly Claude Opus 4.8 measured
Long context reasoning (AA-LCR)77.7%81.0%Grok 4.6
DTBench94.9%97.3%Grok 4.6
LMCA57.5%48.5%Claude Opus 4.8
Surface Evolver Bench87.5%Not measuredOnly Claude Opus 4.8 measured
Furniture assembly42.5%40.0%Claude Opus 4.8
LMArena Text14611429Claude Opus 4.8
LMArena Text: instruction following14761431Claude Opus 4.8
LMArena Text: creative writing14541426Claude Opus 4.8
LMArena Vision12941263Claude Opus 4.8
LMArena Text: English14681433Claude Opus 4.8
LMArena Text: non-English14501420Claude Opus 4.8
LMArena Text: Chinese15061476Claude Opus 4.8
LMArena Text: German14721426Claude Opus 4.8
LMArena Text: Japanese14421378Claude Opus 4.8
LMArena Text: Korean14311391Claude Opus 4.8
LMArena Text: French14811455Claude Opus 4.8
LMArena Text: Spanish14651414Claude Opus 4.8
LMArena Text: Russian14741421Claude Opus 4.8
LMArena Text: Polish14591430Claude Opus 4.8
LMArena Text: multi-turn14761425Claude Opus 4.8
LMArena Text: longer queries14831456Claude Opus 4.8
LMArena Text: writing and language14611429Claude Opus 4.8
LMArena Text: entertainment and media14401421Claude Opus 4.8
LMArena Vision: English12931270Claude Opus 4.8
LMArena Vision: Chinese13461289Claude Opus 4.8
LMArena Vision: reading text13031272Claude Opus 4.8
LMArena Vision: humor12821270Claude Opus 4.8
LMArena Vision: creative writing13011262Claude Opus 4.8
LMArena Document14751452Claude Opus 4.8
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.8 and Grok 4.6
BenchmarkClaude Opus 4.8Grok 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 4.8$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 4.8$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 4.8$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 4.8 and Grok 4.6
SpecificationAnthropic Claude Opus 4.8SpaceXAI Grok 4.6
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedMay 27, 2026August 12, 2026
Context window1M500K
Input $/Mtok$5.00$2.00
Output $/Mtok$25.00$6.00
Coding index65.065.7
Independent measurements behind it66
Cost per solved task$2.17$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.8 better than Grok 4.6 for coding?

Claude Opus 4.8 and Grok 4.6 are level for coding, 65.0 against 65.7 on the Vibe Coding Index, so price and context decide. Pick Claude Opus 4.8 for a larger context window (1M against 500K tokens) and work measured by Terminal-Bench 4 (Vals AI) or Vibe Code Bench (Vals AI), where it leads. Pick Grok 4.6 for output tokens 4.2x cheaper ($6.00 vs $25.00 per million) and a lower cost per solved task ($0.82 against $2.17).

Which is cheaper, Claude Opus 4.8 or Grok 4.6?

Claude Opus 4.8 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 4.8 costs $2.17 and Grok 4.6 $0.82.

Which has the bigger context window, Claude Opus 4.8 or Grok 4.6?

Claude Opus 4.8, with 1M tokens against 500K.

How many benchmarks is the Claude Opus 4.8 vs Grok 4.6 comparison based on?

114 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.8's coding index rests on 6 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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