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Claude Opus 4.8 vs Grok 4.3

Claude Opus 4.8 leads Grok 4.3 on coding, 65.0 to 37.4 on the Vibe Coding Index, and Grok 4.3 costs 10.0x less per output token ($2.50 vs $25.00 per million). Updated October 22, 2026; 101 benchmarks have a result for both.

Replace Claude Opus 4.8 Replace Grok 4.3
Claude Opus 4.8Anthropic
Coding
65.0
Overall
69.8
Output $/M
$25.00
97
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
4
vs boards won of 101 shared

Claude Opus 4.8 or Grok 4.3: which to pick

Pick Claude Opus 4.8 for coding: it scores 65.0 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for output tokens 10.0x cheaper ($2.50 vs $25.00 per million) and a lower cost per solved task ($0.31 against $2.17).

Model AClaude Opus 4.8Anthropic65.0/1006 independent benchmarks$2.17 per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
101
Claude Opus 4.8 only
29
Grok 4.3 only
4
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 4.3 37.4 from 3 benchmarks.
Widest category
Math, 29.2 points apart on average over 6 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Claude Opus 4.8 82.7% against Grok 4.3 19.4%, 63.3 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.8 $25.00 against Grok 4.3 $2.50 per million output tokens, 10.0x apart.
Context window
Both take 1M tokens.

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 4.3Ties
Coding160
Intelligence10
Agentic work161
Reasoning110
Math60
Knowledge92
Web design80
General301
All shared boards974
CodingLike-for-likeSix of these boards feed the Vibe Coding Index160
Coding benchmarks for Claude Opus 4.8 and Grok 4.3
BenchmarkClaude Opus 4.8Grok 4.3Leader
LiveBench coding77.3%Not measuredOnly Claude Opus 4.8 measured
LMArena WebDev15561358Claude Opus 4.8
AA Coding Index74.342.2Claude Opus 4.8
LiveCodeBench (Vals AI)87.8%84.5%Claude Opus 4.8
SWE-bench Verified (Vals AI)88.6%71.4%Claude Opus 4.8
Terminal-Bench 4 (Vals AI)23.2%Not measuredOnly Claude Opus 4.8 measured
Vibe Code Bench (Vals AI)82.7%19.4%Claude Opus 4.8
Code migration (Vals AI)47.3%6.8%Claude Opus 4.8
ProgramBench (Vals AI)1.0%0.0%Claude Opus 4.8
Terminal-Bench 2.1 (Vals AI)71.9%42.0%Claude Opus 4.8
SkillsBench (Vals AI)59.2%40.6%Claude Opus 4.8
SciCode54.4%48.3%Claude Opus 4.8
Terminal-Bench Hard (Artificial Analysis run)58.3%37.9%Claude Opus 4.8
FrontierCode46.5%Not measuredOnly Claude Opus 4.8 measured
GSO-Bench47.1%Not measuredOnly Claude Opus 4.8 measured
WeirdML82.9%49.9%Claude Opus 4.8
ALE-BenchNot measured944.2Only Grok 4.3 measured
LMArena Text: coding14901415Claude Opus 4.8
LMArena Text: software and IT14881416Claude Opus 4.8
LMArena WebDev: React15571353Claude Opus 4.8
LMArena WebDev: HTML15431367Claude Opus 4.8
LMArena WebDev: from an imageNot measured1375Only Grok 4.3 measured
SciCode12.3%Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Claude Opus 4.8 and Grok 4.3
BenchmarkClaude Opus 4.8Grok 4.3Leader
AA Intelligence Index41.824.9Claude Opus 4.8
Epoch Capabilities Index159.0Not measuredOnly Claude Opus 4.8 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index161
Agentic work benchmarks for Claude Opus 4.8 and Grok 4.3
BenchmarkClaude Opus 4.8Grok 4.3Leader
AA Agentic Index41.915.5Claude Opus 4.8
Design Arena: agents building web apps12331126Claude Opus 4.8
Design Arena: agents building full-stack apps12491006Claude Opus 4.8
Design Arena: agents building mobile apps12221058Claude Opus 4.8
Design Arena: agents building Android apps1233962Claude Opus 4.8
Design Arena: agents building Godot games1231914Claude Opus 4.8
Design Arena: agents building games12391007Claude Opus 4.8
Design Arena: HTML slides1171959Claude Opus 4.8
Design Arena: PowerPoint slides1202988Claude Opus 4.8
Design Arena: spreadsheets1303879Claude Opus 4.8
LiveBench research81.8%Not measuredOnly Claude Opus 4.8 measured
LiveBench browser96.0%Not measuredOnly Claude Opus 4.8 measured
LiveBench long agentic48.3%Not measuredOnly Claude Opus 4.8 measured
Finance Agent (Vals AI)53.9%37.7%Claude Opus 4.8
Tax Agent Bench (Vals AI)30.0%6.2%Claude Opus 4.8
Legal Research Bench (Vals AI)43.8%15.4%Claude Opus 4.8
Excel Modeling Benchmark (Vals AI)69.4%18.4%Claude Opus 4.8
Terminal-Bench-Science (Vals AI)4.3%Not measuredOnly Claude Opus 4.8 measured
Time Horizon Index (Vals AI)11.8%Not measuredOnly Claude Opus 4.8 measured
τ²-Bench Telecom94.4%97.7%Grok 4.3
APEX-Agents48.9%Not measuredOnly Claude Opus 4.8 measured
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$35Claude Opus 4.8
LMArena Search12041166Claude Opus 4.8
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Claude Opus 4.8 and Grok 4.3
BenchmarkClaude Opus 4.8Grok 4.3Leader
GPQA Diamond92.4%91.4%Claude Opus 4.8
LiveBench reasoning89.2%Not measuredOnly Claude Opus 4.8 measured
MMMU Pro (Vals AI)86.6%83.1%Claude Opus 4.8
GPQA Diamond (Artificial Analysis run)92.0%90.1%Claude Opus 4.8
Humanity's Last Exam (Artificial Analysis run)48.7%37.2%Claude Opus 4.8
GPQA Diamond (Epoch AI run)91.0%88.8%Claude Opus 4.8
ARC-AGI92.5%Not measuredOnly Claude Opus 4.8 measured
ARC-AGI-272.1%Not measuredOnly Claude Opus 4.8 measured
SimpleBench64.8%Not measuredOnly Claude Opus 4.8 measured
Chess puzzles52.0%18.0%Claude Opus 4.8
Mystery game puzzles36.0%Not measuredOnly Claude Opus 4.8 measured
EBR-bench28.6%Not measuredOnly Claude Opus 4.8 measured
LMArena Text: hard prompts14821396Claude Opus 4.8
LMArena Text: expert15031384Claude Opus 4.8
LMArena Text: hard prompts in English14871402Claude Opus 4.8
LMArena Vision: diagrams13151241Claude Opus 4.8
LMArena Vision: homework13371241Claude Opus 4.8
Kagi LLM Benchmark88.8%Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 4.8 and Grok 4.3
BenchmarkClaude Opus 4.8Grok 4.3Leader
OTIS Mock AIME98.3%93.3%Claude Opus 4.8
FrontierMath, tiers 1 to 380.0%42.8%Claude Opus 4.8
FrontierMath, tier 456.1%14.6%Claude Opus 4.8
ProofBench69.0%11.0%Claude Opus 4.8
LMArena Text: math14861387Claude Opus 4.8
LMArena Text: mathematical work14971396Claude 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 index92
Knowledge benchmarks for Claude Opus 4.8 and Grok 4.3
BenchmarkClaude Opus 4.8Grok 4.3Leader
MMLU Pro89.6%85.8%Claude Opus 4.8
LegalBench (Vals AI)83.6%84.5%Grok 4.3
CaseLaw (Vals AI)Not measured79.3%Only Grok 4.3 measured
CorpFin (Vals AI)66.7%68.5%Grok 4.3
TaxEval (Vals AI)75.6%70.8%Claude Opus 4.8
MortgageTax (Vals AI)69.9%48.3%Claude Opus 4.8
MedCode (Vals AI)53.2%38.1%Claude Opus 4.8
SimpleQA Verified53.0%33.2%Claude Opus 4.8
LMArena Text: science14771399Claude Opus 4.8
LMArena Text: medicine and healthcare14641384Claude Opus 4.8
LMArena Text: legal and government14771386Claude Opus 4.8
LMArena Text: business and finance14581381Claude Opus 4.8
FACTS Benchmark Suite53.5%Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 4.8 and Grok 4.3
BenchmarkClaude Opus 4.8Grok 4.3Leader
Design Arena: websites12581196Claude Opus 4.8
Design Arena: UI components12551190Claude Opus 4.8
Design Arena: game dev12641173Claude Opus 4.8
Design Arena: data viz12401179Claude Opus 4.8
Design Arena: 3D12221124Claude Opus 4.8
Design Arena: all code categories12551186Claude Opus 4.8
Design Arena: SVG11951080Claude Opus 4.8
Design Arena: ASCII art12771125Claude Opus 4.8
LiveBench design78.8%Not measuredOnly Claude Opus 4.8 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index301
General benchmarks for Claude Opus 4.8 and Grok 4.3
BenchmarkClaude Opus 4.8Grok 4.3Leader
LiveBench data analysis66.0%Not measuredOnly Claude Opus 4.8 measured
Public Benefits Bench (Vals AI)68.1%51.7%Claude Opus 4.8
SAGE (Vals AI)54.8%19.7%Claude Opus 4.8
MedScribe (Vals AI)85.8%74.4%Claude Opus 4.8
Vals Multimodal Index70.9%43.3%Claude Opus 4.8
IFBench62.2%83.3%Grok 4.3
Long context reasoning (AA-LCR)77.7%75.0%Claude Opus 4.8
DTBench94.9%90.7%Claude Opus 4.8
LMCA57.5%38.3%Claude Opus 4.8
Surface Evolver Bench87.5%Not measuredOnly Claude Opus 4.8 measured
Furniture assembly42.5%Not measuredOnly Claude Opus 4.8 measured
LMArena Text14611397Claude Opus 4.8
LMArena Text: instruction following14761366Claude Opus 4.8
LMArena Text: creative writing14541380Claude Opus 4.8
LMArena Vision12941229Claude Opus 4.8
LMArena Text: English14681404Claude Opus 4.8
LMArena Text: non-English14501385Claude Opus 4.8
LMArena Text: Chinese15061422Claude Opus 4.8
LMArena Text: German14721395Claude Opus 4.8
LMArena Text: Japanese14421379Claude Opus 4.8
LMArena Text: Korean14311354Claude Opus 4.8
LMArena Text: French14811411Claude Opus 4.8
LMArena Text: Spanish14651399Claude Opus 4.8
LMArena Text: Russian14741399Claude Opus 4.8
LMArena Text: Polish14591398Claude Opus 4.8
LMArena Text: multi-turn14761406Claude Opus 4.8
LMArena Text: longer queries14831393Claude Opus 4.8
LMArena Text: writing and language14611385Claude Opus 4.8
LMArena Text: entertainment and media14401370Claude Opus 4.8
LMArena Vision: English12931235Claude Opus 4.8
LMArena Vision: Chinese13461257Claude Opus 4.8
LMArena Vision: reading text13031235Claude Opus 4.8
LMArena Vision: humor12821222Claude Opus 4.8
LMArena Vision: recognizing thingsNot measured1217Only Grok 4.3 measured
LMArena Vision: creative writing13011237Claude Opus 4.8
LMArena Document1475Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 10 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 4.3
BenchmarkClaude Opus 4.8Grok 4.3Leader
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 4.3$0.0025Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.8$0.325Fits in one request
Grok 4.3$0.070Fits in one request

Grok 4.3 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.8$1.25Fits in one request
Grok 4.3$0.275Fits in one request

Grok 4.3 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 4.3
SpecificationAnthropic Claude Opus 4.8SpaceXAI Grok 4.3
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedMay 27, 2026April 30, 2026
Context window1M1M
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$2.50
Coding index65.037.4
Independent measurements behind it63
Cost per solved task$2.17$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.8 better than Grok 4.3 for coding?

Pick Claude Opus 4.8 for coding: it scores 65.0 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for output tokens 10.0x cheaper ($2.50 vs $25.00 per million) and a lower cost per solved task ($0.31 against $2.17).

Which is cheaper, Claude Opus 4.8 or Grok 4.3?

Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, Claude Opus 4.8 costs $2.17 and Grok 4.3 $0.31.

Which has the bigger context window, Claude Opus 4.8 or Grok 4.3?

Neither: both take 1M tokens.

How many benchmarks is the Claude Opus 4.8 vs Grok 4.3 comparison based on?

101 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 4.3's on 3. Where only one model has a result, the page says so instead of naming a winner.

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