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Claude Opus 5 vs Grok 4.5

Claude Opus 5 leads Grok 4.5 on coding, 83.0 to 58.6 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; 119 benchmarks have a result for both.

Replace Claude Opus 5 Replace Grok 4.5
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
116
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
3
vs boards won of 119 shared

Claude Opus 5 or Grok 4.5: which to pick

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 58.6 for Grok 4.5.

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 $1.33).

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
119
Claude Opus 5 only
12
Grok 4.5 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 5 83.0 from 6 benchmarks, Grok 4.5 58.6 from 6 benchmarks.
Widest category
Math, 28.1 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Opus 5 99.0% against Grok 4.5 31.0%, 68.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Grok 4.5 $6.00 per million output tokens, 4.2x apart.
Context window
Claude Opus 5 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 5BarsGrok 4.5Ties
Coding203
Intelligence20
Agentic work210
Reasoning150
Math60
Knowledge110
Web design90
General320
All shared boards1163
CodingLike-for-likeSix of these boards feed the Vibe Coding Index203
Coding benchmarks for Claude Opus 5 and Grok 4.5
BenchmarkClaude Opus 5Grok 4.5Leader
LiveBench coding90.8%94.3%Grok 4.5
LMArena WebDev16891553Claude Opus 5
AA Coding Index78.072.4Claude Opus 5
LiveCodeBench (Vals AI)89.0%87.3%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%86.6%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%8.6%Claude Opus 5
Vibe Code Bench (Vals AI)88.4%69.0%Claude Opus 5
Code migration (Vals AI)57.5%36.6%Claude Opus 5
ProgramBench (Vals AI)3.0%0.0%Claude Opus 5
IOI (Vals AI)84.3%40.6%Claude Opus 5
Terminal-Bench 2.1 (Vals AI)84.6%67.8%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%66.0%Grok 4.5
CyberBench (Vals AI)65.4%71.0%Grok 4.5
SciCode56.4%55.0%Claude Opus 5
FrontierCode53.4%42.4%Claude Opus 5
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
WeirdML91.8%46.4%Claude Opus 5
ALE-Bench2164.61309.3Claude Opus 5
LMArena Text: coding15331474Claude Opus 5
LMArena Text: software and IT15271471Claude Opus 5
LMArena WebDev: React17111556Claude Opus 5
LMArena WebDev: HTML16801567Claude Opus 5
LMArena WebDev: from an image16621562Claude Opus 5
SciCode13.8%6.5%Claude Opus 5
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and Grok 4.5
BenchmarkClaude Opus 5Grok 4.5Leader
AA Intelligence Index50.838.8Claude Opus 5
Epoch Capabilities Index163.9154.1Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index210
Agentic work benchmarks for Claude Opus 5 and Grok 4.5
BenchmarkClaude Opus 5Grok 4.5Leader
AA Agentic Index56.541.2Claude Opus 5
Design Arena: agents building web apps12661218Claude Opus 5
Design Arena: agents building full-stack apps13061249Claude Opus 5
Design Arena: agents building mobile apps13481220Claude Opus 5
Design Arena: agents building Android apps12571236Claude Opus 5
Design Arena: agents building Godot games12791229Claude Opus 5
Design Arena: agents building games12611236Claude Opus 5
Design Arena: HTML slidesNot measured1205Only Grok 4.5 measured
Design Arena: PowerPoint slides12401230Claude Opus 5
LiveBench research88.9%85.9%Claude Opus 5
LiveBench browser84.0%44.0%Claude Opus 5
LiveBench long agentic62.1%27.9%Claude Opus 5
SREBench (Vals AI)12.2%0.8%Claude Opus 5
Finance Agent (Vals AI)58.6%48.4%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%24.9%Claude Opus 5
Legal Research Bench (Vals AI)55.3%38.0%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%52.9%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%6.3%Claude Opus 5
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
APEX-Agents65.8%56.2%Claude Opus 5
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%23.4%Claude Opus 5
Vending-Bench 2$11,182$3,887Claude Opus 5
LMArena Search12421216Claude Opus 5
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index150
Reasoning benchmarks for Claude Opus 5 and Grok 4.5
BenchmarkClaude Opus 5Grok 4.5Leader
GPQA Diamond93.4%92.9%Claude Opus 5
LiveBench reasoning91.2%87.2%Claude Opus 5
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%61.8%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%93.1%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)54.9%42.7%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%93.4%Claude Opus 5
ARC-AGI97.5%87.2%Claude Opus 5
ARC-AGI-290.4%52.6%Claude Opus 5
SimpleBench80.6%70.0%Claude Opus 5
Chess puzzles43.0%35.0%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 prompts15271462Claude Opus 5
LMArena Text: expert15541465Claude Opus 5
LMArena Text: hard prompts in English15231464Claude Opus 5
LMArena Vision: diagrams13481304Claude Opus 5
LMArena Vision: homework13381295Claude Opus 5
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 index60
Math benchmarks for Claude Opus 5 and Grok 4.5
BenchmarkClaude Opus 5Grok 4.5Leader
OTIS Mock AIME98.9%97.8%Claude Opus 5
FrontierMath, tiers 1 to 385.6%57.2%Claude Opus 5
FrontierMath, tier 473.2%24.4%Claude Opus 5
ProofBench99.0%31.0%Claude Opus 5
LMArena Text: math15331460Claude Opus 5
LMArena Text: mathematical work15441482Claude 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 4.5
BenchmarkClaude Opus 5Grok 4.5Leader
MMLU Pro91.6%89.2%Claude Opus 5
LegalBench (Vals AI)87.0%86.0%Claude Opus 5
CorpFin (Vals AI)73.2%67.4%Claude Opus 5
TaxEval (Vals AI)75.1%71.7%Claude Opus 5
MortgageTax (Vals AI)72.1%61.8%Claude Opus 5
MedCode (Vals AI)63.6%43.3%Claude Opus 5
SimpleQA Verified59.9%48.3%Claude Opus 5
LMArena Text: science15311464Claude Opus 5
LMArena Text: medicine and healthcare15251440Claude Opus 5
LMArena Text: legal and government15301463Claude Opus 5
LMArena Text: business and finance15011441Claude Opus 5
FACTS Benchmark SuiteNot measured50.2%Only Grok 4.5 measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for Claude Opus 5 and Grok 4.5
BenchmarkClaude Opus 5Grok 4.5Leader
Design Arena: websites13091281Claude Opus 5
Design Arena: UI components13461280Claude Opus 5
Design Arena: game dev13371264Claude Opus 5
Design Arena: data viz13291266Claude Opus 5
Design Arena: 3D13341257Claude Opus 5
Design Arena: all code categories13231275Claude Opus 5
Design Arena: SVG13111215Claude Opus 5
Design Arena: ASCII art13521256Claude Opus 5
LiveBench design83.0%78.1%Claude Opus 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index320
General benchmarks for Claude Opus 5 and Grok 4.5
BenchmarkClaude Opus 5Grok 4.5Leader
LiveBench data analysis74.6%73.0%Claude Opus 5
Public Benefits Bench (Vals AI)76.9%Not measuredOnly Claude Opus 5 measured
SAGE (Vals AI)49.4%35.0%Claude Opus 5
MedScribe (Vals AI)91.0%86.9%Claude Opus 5
Vals Multimodal Index73.9%63.4%Claude Opus 5
Long context reasoning (AA-LCR)82.0%79.3%Claude Opus 5
DTBench97.9%96.5%Claude Opus 5
LMCA64.5%45.2%Claude Opus 5
Surface Evolver BenchNot measured74.4%Only Grok 4.5 measured
Furniture assembly60.8%22.5%Claude Opus 5
LMArena Text15091448Claude Opus 5
LMArena Text: instruction following15181445Claude Opus 5
LMArena Text: creative writing14931442Claude Opus 5
LMArena Vision13201287Claude Opus 5
LMArena Text: English15081453Claude Opus 5
LMArena Text: non-English15021440Claude Opus 5
LMArena Text: Chinese15731495Claude Opus 5
LMArena Text: German15271448Claude Opus 5
LMArena Text: Japanese15201430Claude Opus 5
LMArena Text: Korean15171406Claude Opus 5
LMArena Text: French15191457Claude Opus 5
LMArena Text: Spanish15231451Claude Opus 5
LMArena Text: Russian15071449Claude Opus 5
LMArena Text: Polish15221432Claude Opus 5
LMArena Text: multi-turn15001456Claude Opus 5
LMArena Text: longer queries15171462Claude Opus 5
LMArena Text: writing and language14991445Claude Opus 5
LMArena Text: entertainment and media14811434Claude Opus 5
LMArena Vision: English13151285Claude Opus 5
LMArena Vision: Chinese14001345Claude Opus 5
LMArena Vision: reading text13291293Claude Opus 5
LMArena Vision: humor12931276Claude Opus 5
LMArena Vision: creative writing13131293Claude Opus 5
LMArena Document15161452Claude Opus 5
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 5 and Grok 4.5
BenchmarkClaude Opus 5Grok 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 5$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 5$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 5$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 5 and Grok 4.5
SpecificationAnthropic Claude Opus 5SpaceXAI Grok 4.5
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026July 8, 2026
Context window1M500K
Input $/Mtok$5.00$2.00
Output $/Mtok$25.00$6.00
Coding index83.058.6
Independent measurements behind it66
Cost per solved task$1.33$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than Grok 4.5 for coding?

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 58.6 for Grok 4.5. 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 $1.33).

Which is cheaper, Claude Opus 5 or Grok 4.5?

Claude Opus 5 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 5 costs $1.33 and Grok 4.5 $0.62.

Which has the bigger context window, Claude Opus 5 or Grok 4.5?

Claude Opus 5, with 1M tokens against 500K.

How many benchmarks is the Claude Opus 5 vs Grok 4.5 comparison based on?

119 benchmarks have a result for both models as of October 22, 2026. Claude Opus 5's coding index rests on 6 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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