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Claude Opus 5 vs Grok 4.3

Updated October 21, 2026. 98 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 5 Replace Grok 4.3
Claude Opus 5Anthropic
Coding
81.8
Overall
50.8
Output $/M
$25.00
98
Grok 4.3xAI
Coding
22.5
Overall
24.9
Output $/M
$2.50
0
vs boards won of 98 shared

Decision reading

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 22.5 for Grok 4.3.

Pick Grok 4.3 when output tokens cost 10.0x less, or when a solved task costs $0.31 against $1.33.

Model AClaude Opus 5Anthropic81.8/1002 independent benchmarks$1.33 per solved taskModel BGrok 4.3xAI22.5/1001 independent benchmark$0.31 per solved task
Shared results
98
Claude Opus 5 only
32
Grok 4.3 only
6
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 5 81.8 from 2 benchmarks, Grok 4.3 22.5 from 1 benchmark.
Widest category
Math, 40.7 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Opus 5 99.0% against Grok 4.3 11.0%, 88.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $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 5BarsGrok 4.3Ties
Coding170
Intelligence10
Agentic work140
Reasoning110
Math60
Knowledge110
Web design80
General300
All shared boards980
CodingLike-for-likeFour of these boards feed the Vibe Coding Index170
Coding benchmarks for Claude Opus 5 and Grok 4.3
BenchmarkClaude Opus 5Grok 4.3Leader
LiveBench coding90.8%Not measuredOnly Claude Opus 5 measured
LMArena WebDev16891358Claude Opus 5
AA Coding Index78.042.2Claude Opus 5
LiveCodeBench (Vals AI)89.0%84.5%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%71.4%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench (Vals AI)88.4%19.4%Claude Opus 5
Code migration (Vals AI)57.5%6.8%Claude Opus 5
ProgramBench (Vals AI)3.0%0.0%Claude Opus 5
IOI (Vals AI)84.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)84.6%42.0%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%40.6%Claude Opus 5
CyberBench (Vals AI)65.4%Not measuredOnly Claude Opus 5 measured
SciCode56.4%48.3%Claude Opus 5
Terminal-Bench Hard (Artificial Analysis run)Not measured37.9%Only Grok 4.3 measured
FrontierCode53.4%Not measuredOnly Claude Opus 5 measured
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
WeirdML91.8%49.9%Claude Opus 5
ALE-Bench2164.6944.2Claude Opus 5
LMArena Text: coding15331415Claude Opus 5
LMArena Text: software and IT15271416Claude Opus 5
LMArena WebDev: React17111353Claude Opus 5
LMArena WebDev: HTML16801367Claude Opus 5
LMArena WebDev: from an image16621375Claude Opus 5
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Claude Opus 5 and Grok 4.3
BenchmarkClaude Opus 5Grok 4.3Leader
AA Intelligence Index50.824.9Claude Opus 5
Epoch Capabilities Index163.9Not measuredOnly Claude Opus 5 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index140
Agentic work benchmarks for Claude Opus 5 and Grok 4.3
BenchmarkClaude Opus 5Grok 4.3Leader
AA Agentic Index56.515.5Claude Opus 5
Design Arena: agents building web apps12661126Claude Opus 5
Design Arena: agents building full-stack apps13061006Claude Opus 5
Design Arena: agents building mobile apps13481059Claude Opus 5
Design Arena: agents building Android apps1258967Claude Opus 5
Design Arena: agents building Godot games1279914Claude Opus 5
Design Arena: agents building games12611007Claude Opus 5
Design Arena: HTML slidesNot measured1008Only Grok 4.3 measured
Design Arena: PowerPoint slides12651012Claude Opus 5
LiveBench research88.9%Not measuredOnly Claude Opus 5 measured
LiveBench browser84.0%Not measuredOnly Claude Opus 5 measured
LiveBench long agentic62.1%Not measuredOnly Claude Opus 5 measured
SREBench (Vals AI)12.2%Not measuredOnly Claude Opus 5 measured
Finance Agent (Vals AI)58.6%37.7%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%6.2%Claude Opus 5
Legal Research Bench (Vals AI)55.3%15.4%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%18.4%Claude Opus 5
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)27.1%Not measuredOnly Claude Opus 5 measured
Vals Science Index47.9%Not measuredOnly Claude Opus 5 measured
Time Horizon Index (Vals AI)18.8%Not measuredOnly Claude Opus 5 measured
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
τ²-Bench TelecomNot measured97.7%Only Grok 4.3 measured
APEX-Agents65.8%Not measuredOnly Claude Opus 5 measured
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182$35Claude Opus 5
LMArena Search12421166Claude Opus 5
Neither model has a result on the other 10 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Claude Opus 5 and Grok 4.3
BenchmarkClaude Opus 5Grok 4.3Leader
GPQA Diamond93.4%91.4%Claude Opus 5
LiveBench reasoning91.2%Not measuredOnly Claude Opus 5 measured
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%83.1%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%90.1%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)54.9%37.2%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%88.8%Claude Opus 5
ARC-AGI97.5%Not measuredOnly Claude Opus 5 measured
ARC-AGI-290.4%Not measuredOnly Claude Opus 5 measured
SimpleBench80.6%Not measuredOnly Claude Opus 5 measured
Chess puzzles43.0%18.0%Claude Opus 5
Mystery game puzzles59.0%Not measuredOnly Claude Opus 5 measured
EBR-bench45.7%Not measuredOnly Claude Opus 5 measured
LMArena Text: hard prompts15271396Claude Opus 5
LMArena Text: expert15541384Claude Opus 5
LMArena Text: hard prompts in English15231402Claude Opus 5
LMArena Vision: diagrams13481241Claude Opus 5
LMArena Vision: homework13381241Claude Opus 5
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5 and Grok 4.3
BenchmarkClaude Opus 5Grok 4.3Leader
OTIS Mock AIME98.9%93.3%Claude Opus 5
FrontierMath, tiers 1 to 385.6%42.8%Claude Opus 5
FrontierMath, tier 473.2%14.6%Claude Opus 5
ProofBench99.0%11.0%Claude Opus 5
LMArena Text: math15331387Claude Opus 5
LMArena Text: mathematical work15441396Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Opus 5 and Grok 4.3
BenchmarkClaude Opus 5Grok 4.3Leader
MMLU Pro91.6%85.8%Claude Opus 5
LegalBench (Vals AI)87.0%84.5%Claude Opus 5
CaseLaw (Vals AI)Not measured79.3%Only Grok 4.3 measured
CorpFin (Vals AI)73.2%68.5%Claude Opus 5
TaxEval (Vals AI)75.1%70.8%Claude Opus 5
MortgageTax (Vals AI)72.1%48.3%Claude Opus 5
MedCode (Vals AI)63.6%38.1%Claude Opus 5
SimpleQA Verified59.9%33.2%Claude Opus 5
LMArena Text: science15311399Claude Opus 5
LMArena Text: medicine and healthcare15251384Claude Opus 5
LMArena Text: legal and government15301386Claude Opus 5
LMArena Text: business and finance15011381Claude Opus 5
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 5 and Grok 4.3
BenchmarkClaude Opus 5Grok 4.3Leader
Design Arena: websites13091196Claude Opus 5
Design Arena: UI components13481192Claude Opus 5
Design Arena: game dev13391174Claude Opus 5
Design Arena: data viz13291180Claude Opus 5
Design Arena: 3D13351125Claude Opus 5
Design Arena: all code categories13241187Claude Opus 5
Design Arena: SVG13101081Claude Opus 5
Design Arena: ASCII art13521125Claude Opus 5
LiveBench design83.0%Not measuredOnly Claude Opus 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index300
General benchmarks for Claude Opus 5 and Grok 4.3
BenchmarkClaude Opus 5Grok 4.3Leader
LiveBench data analysis74.6%Not measuredOnly Claude Opus 5 measured
Public Benefits Bench (Vals AI)76.9%51.7%Claude Opus 5
SAGE (Vals AI)49.4%19.7%Claude Opus 5
MedScribe (Vals AI)91.0%74.4%Claude Opus 5
Vals Multimodal Index73.9%43.3%Claude Opus 5
IFBenchNot measured83.3%Only Grok 4.3 measured
Long context reasoning (AA-LCR)82.0%75.0%Claude Opus 5
DTBench97.9%90.7%Claude Opus 5
LMCA64.5%38.3%Claude Opus 5
Furniture assembly60.8%Not measuredOnly Claude Opus 5 measured
LMArena Text15091397Claude Opus 5
LMArena Text: instruction following15181366Claude Opus 5
LMArena Text: creative writing14931380Claude Opus 5
LMArena Vision13201229Claude Opus 5
LMArena Text: English15081404Claude Opus 5
LMArena Text: non-English15021385Claude Opus 5
LMArena Text: Chinese15731422Claude Opus 5
LMArena Text: German15271395Claude Opus 5
LMArena Text: Japanese15201379Claude Opus 5
LMArena Text: Korean15171354Claude Opus 5
LMArena Text: French15191411Claude Opus 5
LMArena Text: Spanish15231399Claude Opus 5
LMArena Text: Russian15071399Claude Opus 5
LMArena Text: Polish15221398Claude Opus 5
LMArena Text: multi-turn15001406Claude Opus 5
LMArena Text: longer queries15171393Claude Opus 5
LMArena Text: writing and language14991385Claude Opus 5
LMArena Text: entertainment and media14811370Claude Opus 5
LMArena Vision: English13151235Claude Opus 5
LMArena Vision: Chinese14001257Claude Opus 5
LMArena Vision: reading text13291235Claude Opus 5
LMArena Vision: humor12931222Claude Opus 5
LMArena Vision: recognizing thingsNot measured1217Only Grok 4.3 measured
LMArena Vision: creative writing13131237Claude Opus 5
LMArena Document1516Not measuredOnly Claude Opus 5 measured
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 5 and Grok 4.3
BenchmarkClaude Opus 5Grok 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 5$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 5$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 5$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 5 and Grok 4.3
SpecificationAnthropic Claude Opus 5SpaceXAI Grok 4.3
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026April 30, 2026
Context window1M1M
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$2.50
Coding index81.822.5
Independent measurements behind it21
Cost per solved task$1.33$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than Grok 4.3 for coding?

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 22.5 for Grok 4.3. Pick Grok 4.3 when output tokens cost 10.0x less, or when a solved task costs $0.31 against $1.33.

Which is cheaper, Claude Opus 5 or Grok 4.3?

Claude Opus 5 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 5 costs $1.33 and Grok 4.3 $0.31.

Which has the bigger context window, Claude Opus 5 or Grok 4.3?

Neither: both take 1M tokens.

How many benchmarks is the Claude Opus 5 vs Grok 4.3 comparison based on?

98 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 2 independent benchmarks and Grok 4.3's on 1. Where only one model has a result, the page says so instead of naming a winner.

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