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Claude Opus 4.8 vs Grok 4.5

Claude Opus 4.8 leads Grok 4.5 on coding, 65.0 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; 118 benchmarks have a result for both.

Replace Claude Opus 4.8 Replace Grok 4.5
Claude Opus 4.8Anthropic
Coding
65.0
Overall
69.8
Output $/M
$25.00
90
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
26
vs boards won of 118 shared, 2 tied

Claude Opus 4.8 or Grok 4.5: which to pick

Pick Claude Opus 4.8 for coding: it scores 65.0 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 $2.17).

Model AClaude Opus 4.8Anthropic65.0/1006 independent benchmarks$2.17 per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
118
Claude Opus 4.8 only
12
Grok 4.5 only
5
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 4.5 58.6 from 6 benchmarks.
Widest category
Math, 16.7 points apart on average over 6 shared benchmarks.
Widest single gap
LiveBench browser: Claude Opus 4.8 96.0% against Grok 4.5 44.0%, 52.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.8 $25.00 against Grok 4.5 $6.00 per million output tokens, 4.2x apart.
Context window
Claude Opus 4.8 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 4.8BarsGrok 4.5Ties
Coding154
Intelligence20
Agentic work1461 tie
Reasoning124
Math60
Knowledge102
Web design261 tie
General294
All shared boards90262 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index154
Coding benchmarks for Claude Opus 4.8 and Grok 4.5
BenchmarkClaude Opus 4.8Grok 4.5Leader
LiveBench coding77.3%94.3%Grok 4.5
LMArena WebDev15561553Claude Opus 4.8
AA Coding Index74.372.4Claude Opus 4.8
LiveCodeBench (Vals AI)87.8%87.3%Claude Opus 4.8
SWE-bench Verified (Vals AI)88.6%86.6%Claude Opus 4.8
Terminal-Bench 4 (Vals AI)23.2%8.6%Claude Opus 4.8
Vibe Code Bench (Vals AI)82.7%69.0%Claude Opus 4.8
Code migration (Vals AI)47.3%36.6%Claude Opus 4.8
ProgramBench (Vals AI)1.0%0.0%Claude Opus 4.8
IOI (Vals AI)Not measured40.6%Only Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)71.9%67.8%Claude Opus 4.8
SkillsBench (Vals AI)59.2%66.0%Grok 4.5
CyberBench (Vals AI)Not measured71.0%Only Grok 4.5 measured
SciCode54.4%55.0%Grok 4.5
Terminal-Bench Hard (Artificial Analysis run)58.3%Not measuredOnly Claude Opus 4.8 measured
FrontierCode46.5%42.4%Claude Opus 4.8
GSO-Bench47.1%Not measuredOnly Claude Opus 4.8 measured
WeirdML82.9%46.4%Claude Opus 4.8
ALE-BenchNot measured1309.3Only Grok 4.5 measured
LMArena Text: coding14901474Claude Opus 4.8
LMArena Text: software and IT14881471Claude Opus 4.8
LMArena WebDev: React15571556Claude Opus 4.8
LMArena WebDev: HTML15431567Grok 4.5
LMArena WebDev: from an imageNot measured1562Only Grok 4.5 measured
SciCode12.3%6.5%Claude Opus 4.8
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 4.8 and Grok 4.5
BenchmarkClaude Opus 4.8Grok 4.5Leader
AA Intelligence Index41.838.8Claude Opus 4.8
Epoch Capabilities Index159.0154.1Claude Opus 4.8
Agentic workLike-for-likePublic boards, shown as published, kept out of the index146
Agentic work benchmarks for Claude Opus 4.8 and Grok 4.5
BenchmarkClaude Opus 4.8Grok 4.5Leader
AA Agentic Index41.941.2Claude Opus 4.8
Design Arena: agents building web apps12331218Claude Opus 4.8
Design Arena: agents building full-stack apps12491249Tie
Design Arena: agents building mobile apps12221220Claude Opus 4.8
Design Arena: agents building Android apps12331236Grok 4.5
Design Arena: agents building Godot games12311229Claude Opus 4.8
Design Arena: agents building games12391236Claude Opus 4.8
Design Arena: HTML slides11711205Grok 4.5
Design Arena: PowerPoint slides12021230Grok 4.5
Design Arena: spreadsheets1303Not measuredOnly Claude Opus 4.8 measured
LiveBench research81.8%85.9%Grok 4.5
LiveBench browser96.0%44.0%Claude Opus 4.8
LiveBench long agentic48.3%27.9%Claude Opus 4.8
SREBench (Vals AI)Not measured0.8%Only Grok 4.5 measured
Finance Agent (Vals AI)53.9%48.4%Claude Opus 4.8
Tax Agent Bench (Vals AI)30.0%24.9%Claude Opus 4.8
Legal Research Bench (Vals AI)43.8%38.0%Claude Opus 4.8
Excel Modeling Benchmark (Vals AI)69.4%52.9%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%6.3%Claude Opus 4.8
τ²-Bench Telecom94.4%Not measuredOnly Claude Opus 4.8 measured
APEX-Agents48.9%56.2%Grok 4.5
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%23.4%Claude Opus 4.8
Vending-Bench 2$5,787$3,887Claude Opus 4.8
LMArena Search12041216Grok 4.5
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index124
Reasoning benchmarks for Claude Opus 4.8 and Grok 4.5
BenchmarkClaude Opus 4.8Grok 4.5Leader
GPQA Diamond92.4%92.9%Grok 4.5
LiveBench reasoning89.2%87.2%Claude Opus 4.8
MMMU Pro (Vals AI)86.6%61.8%Claude Opus 4.8
GPQA Diamond (Artificial Analysis run)92.0%93.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)48.7%42.7%Claude Opus 4.8
GPQA Diamond (Epoch AI run)91.0%93.4%Grok 4.5
ARC-AGI92.5%87.2%Claude Opus 4.8
ARC-AGI-272.1%52.6%Claude Opus 4.8
SimpleBench64.8%70.0%Grok 4.5
Chess puzzles52.0%35.0%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 prompts14821462Claude Opus 4.8
LMArena Text: expert15031465Claude Opus 4.8
LMArena Text: hard prompts in English14871464Claude Opus 4.8
LMArena Vision: diagrams13151304Claude Opus 4.8
LMArena Vision: homework13371295Claude Opus 4.8
Kagi LLM Benchmark88.8%83.5%Claude Opus 4.8
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 4.5
BenchmarkClaude Opus 4.8Grok 4.5Leader
OTIS Mock AIME98.3%97.8%Claude Opus 4.8
FrontierMath, tiers 1 to 380.0%57.2%Claude Opus 4.8
FrontierMath, tier 456.1%24.4%Claude Opus 4.8
ProofBench69.0%31.0%Claude Opus 4.8
LMArena Text: math14861460Claude Opus 4.8
LMArena Text: mathematical work14971482Claude 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 index102
Knowledge benchmarks for Claude Opus 4.8 and Grok 4.5
BenchmarkClaude Opus 4.8Grok 4.5Leader
MMLU Pro89.6%89.2%Claude Opus 4.8
LegalBench (Vals AI)83.6%86.0%Grok 4.5
CorpFin (Vals AI)66.7%67.4%Grok 4.5
TaxEval (Vals AI)75.6%71.7%Claude Opus 4.8
MortgageTax (Vals AI)69.9%61.8%Claude Opus 4.8
MedCode (Vals AI)53.2%43.3%Claude Opus 4.8
SimpleQA Verified53.0%48.3%Claude Opus 4.8
LMArena Text: science14771464Claude Opus 4.8
LMArena Text: medicine and healthcare14641440Claude Opus 4.8
LMArena Text: legal and government14771463Claude Opus 4.8
LMArena Text: business and finance14581441Claude Opus 4.8
FACTS Benchmark Suite53.5%50.2%Claude Opus 4.8
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index26
Web design benchmarks for Claude Opus 4.8 and Grok 4.5
BenchmarkClaude Opus 4.8Grok 4.5Leader
Design Arena: websites12581281Grok 4.5
Design Arena: UI components12551280Grok 4.5
Design Arena: game dev12641264Tie
Design Arena: data viz12401266Grok 4.5
Design Arena: 3D12221257Grok 4.5
Design Arena: all code categories12551275Grok 4.5
Design Arena: SVG11951215Grok 4.5
Design Arena: ASCII art12771256Claude Opus 4.8
LiveBench design78.8%78.1%Claude Opus 4.8
GeneralLike-for-likePublic boards, shown as published, kept out of the index294
General benchmarks for Claude Opus 4.8 and Grok 4.5
BenchmarkClaude Opus 4.8Grok 4.5Leader
LiveBench data analysis66.0%73.0%Grok 4.5
Public Benefits Bench (Vals AI)68.1%Not measuredOnly Claude Opus 4.8 measured
SAGE (Vals AI)54.8%35.0%Claude Opus 4.8
MedScribe (Vals AI)85.8%86.9%Grok 4.5
Vals Multimodal Index70.9%63.4%Claude Opus 4.8
IFBench62.2%Not measuredOnly Claude Opus 4.8 measured
Long context reasoning (AA-LCR)77.7%79.3%Grok 4.5
DTBench94.9%96.5%Grok 4.5
LMCA57.5%45.2%Claude Opus 4.8
Surface Evolver Bench87.5%74.4%Claude Opus 4.8
Furniture assembly42.5%22.5%Claude Opus 4.8
LMArena Text14611448Claude Opus 4.8
LMArena Text: instruction following14761445Claude Opus 4.8
LMArena Text: creative writing14541442Claude Opus 4.8
LMArena Vision12941287Claude Opus 4.8
LMArena Text: English14681453Claude Opus 4.8
LMArena Text: non-English14501440Claude Opus 4.8
LMArena Text: Chinese15061495Claude Opus 4.8
LMArena Text: German14721448Claude Opus 4.8
LMArena Text: Japanese14421430Claude Opus 4.8
LMArena Text: Korean14311406Claude Opus 4.8
LMArena Text: French14811457Claude Opus 4.8
LMArena Text: Spanish14651451Claude Opus 4.8
LMArena Text: Russian14741449Claude Opus 4.8
LMArena Text: Polish14591432Claude Opus 4.8
LMArena Text: multi-turn14761456Claude Opus 4.8
LMArena Text: longer queries14831462Claude Opus 4.8
LMArena Text: writing and language14611445Claude Opus 4.8
LMArena Text: entertainment and media14401434Claude Opus 4.8
LMArena Vision: English12931285Claude Opus 4.8
LMArena Vision: Chinese13461345Claude Opus 4.8
LMArena Vision: reading text13031293Claude Opus 4.8
LMArena Vision: humor12821276Claude Opus 4.8
LMArena Vision: creative writing13011293Claude 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 4.5
BenchmarkClaude Opus 4.8Grok 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 4.8$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 4.8$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 4.8$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 4.8 and Grok 4.5
SpecificationAnthropic Claude Opus 4.8SpaceXAI Grok 4.5
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedMay 27, 2026July 8, 2026
Context window1M500K
Input $/Mtok$5.00$2.00
Output $/Mtok$25.00$6.00
Coding index65.058.6
Independent measurements behind it66
Cost per solved task$2.17$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.8 better than Grok 4.5 for coding?

Pick Claude Opus 4.8 for coding: it scores 65.0 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 $2.17).

Which is cheaper, Claude Opus 4.8 or Grok 4.5?

Claude Opus 4.8 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 4.8 costs $2.17 and Grok 4.5 $0.62.

Which has the bigger context window, Claude Opus 4.8 or Grok 4.5?

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

How many benchmarks is the Claude Opus 4.8 vs Grok 4.5 comparison based on?

118 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 4.5's on 6. Where only one model has a result, the page says so instead of naming a winner.

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