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Claude Opus 5.5 vs Grok 4.7

Updated October 21, 2026. 94 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 5.5 Replace Grok 4.7
Claude Opus 5.5Anthropic
Coding
92.2
Overall
57.6
Output $/M
$20.00
90
Grok 4.7xAI
Coding
75.0
Overall
46.4
Output $/M
$6.00
4
vs boards won of 94 shared

Decision reading

Pick Claude Opus 5.5 for coding: it scores 92.2 on the Vibe Coding Index against 75.0 for Grok 4.7.

Pick Grok 4.7 when output tokens cost 3.3x less, or when what matters is LiveBench research or Harvey's Legal Agent Benchmark (Vals AI), where it leads.

Model AClaude Opus 5.5Anthropic92.2/1002 independent benchmarksNo cost per solved taskModel BGrok 4.7xAI75.0/1002 independent benchmarksNo cost per solved task
Shared results
94
Claude Opus 5.5 only
13
Grok 4.7 only
5
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 5.5 92.2 from 2 benchmarks, Grok 4.7 75.0 from 2 benchmarks.
Widest category
Math, 37.2 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Opus 5.5 95.0% against Grok 4.7 17.1%, 77.9 points apart on a 0 to 100 scale.
Output price
Claude Opus 5.5 $20.00 against Grok 4.7 $6.00 per million output tokens, 3.3x apart.
Context window
Claude Opus 5.5 takes 1M tokens, Grok 4.7 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 5.5BarsGrok 4.7Ties
Coding180
Intelligence20
Agentic work123
Reasoning121
Math60
Knowledge60
Web design70
General270
All shared boards904
CodingLike-for-likeFour of these boards feed the Vibe Coding Index180
Coding benchmarks for Claude Opus 5.5 and Grok 4.7
BenchmarkClaude Opus 5.5Grok 4.7Leader
LiveBench coding96.3%84.5%Claude Opus 5.5
LMArena WebDev18071637Claude Opus 5.5
Terminal-Bench 4 (Vals AI)65.2%28.8%Claude Opus 5.5
Vibe Code Bench (Vals AI)90.3%86.2%Claude Opus 5.5
Code migration (Vals AI)66.7%44.8%Claude Opus 5.5
ProgramBench (Vals AI)18.5%0.5%Claude Opus 5.5
IOI (Vals AI)95.1%57.7%Claude Opus 5.5
Terminal-Bench 2.1 (Vals AI)87.6%73.4%Claude Opus 5.5
SWE-bench Multimodal (Vals AI)70.2%42.9%Claude Opus 5.5
Vibe Code Bench 1-100 (Vals AI)30.4%Not measuredOnly Claude Opus 5.5 measured
CyberBench (Vals AI)74.6%69.5%Claude Opus 5.5
SciCode66.9%57.8%Claude Opus 5.5
FrontierCode54.6%47.6%Claude Opus 5.5
FrontierSWE62.3%29.5%Claude Opus 5.5
MirrorCode77.4%Not measuredOnly Claude Opus 5.5 measured
ALE-Bench2147.4Not measuredOnly Claude Opus 5.5 measured
LMArena Text: coding15451432Claude Opus 5.5
LMArena Text: software and IT15381421Claude Opus 5.5
LMArena WebDev: React18551663Claude Opus 5.5
LMArena WebDev: HTML17531627Claude Opus 5.5
LMArena WebDev: from an image17531586Claude Opus 5.5
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5.5 and Grok 4.7
BenchmarkClaude Opus 5.5Grok 4.7Leader
AA Intelligence Index57.646.4Claude Opus 5.5
Epoch Capabilities Index168.8154.4Claude Opus 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index123
Agentic work benchmarks for Claude Opus 5.5 and Grok 4.7
BenchmarkClaude Opus 5.5Grok 4.7Leader
Design Arena: agents building web apps1316Not measuredOnly Claude Opus 5.5 measured
Design Arena: agents building mobile apps1311Not measuredOnly Claude Opus 5.5 measured
Design Arena: spreadsheets1359Not measuredOnly Claude Opus 5.5 measured
LiveBench research85.0%86.4%Grok 4.7
LiveBench browser80.0%60.0%Claude Opus 5.5
LiveBench long agentic85.0%50.1%Claude Opus 5.5
SREBench (Vals AI)33.6%3.8%Claude Opus 5.5
Finance Agent (Vals AI)58.6%52.3%Claude Opus 5.5
Tax Agent Bench (Vals AI)45.6%34.2%Claude Opus 5.5
Legal Research Bench (Vals AI)50.5%47.1%Claude Opus 5.5
Harvey's Legal Agent Benchmark (Vals AI)9.2%18.3%Grok 4.7
Excel Modeling Benchmark (Vals AI)75.9%67.0%Claude Opus 5.5
BioMysteryBench (Vals AI)79.3%69.3%Claude Opus 5.5
Terminal-Bench-Science (Vals AI)47.1%10.0%Claude Opus 5.5
Vals Science Index58.7%34.8%Claude Opus 5.5
Time Horizon Index (Vals AI)91.3%Not measuredOnly Claude Opus 5.5 measured
CUA-bench (Vals AI)14.0%Not measuredOnly Claude Opus 5.5 measured
Robo-bench (Vals AI)14.6%0.2%Claude Opus 5.5
APEX-Agents73.5%54.6%Claude Opus 5.5
Remote Labor Index21.3%Not measuredOnly Claude Opus 5.5 measured
SpireClimb3.3%Not measuredOnly Claude Opus 5.5 measured
Vending-Bench 2$9,235$10,537Grok 4.7
LMArena Search1213Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index121
Reasoning benchmarks for Claude Opus 5.5 and Grok 4.7
BenchmarkClaude Opus 5.5Grok 4.7Leader
LiveBench reasoning92.2%82.7%Claude Opus 5.5
MysteryMechanism (Vals AI)49.5%25.2%Claude Opus 5.5
Humanity's Last Exam (Artificial Analysis run)61.4%43.1%Claude Opus 5.5
GPQA Diamond (Epoch AI run)90.6%92.7%Grok 4.7
ARC-AGI98.5%90.2%Claude Opus 5.5
ARC-AGI-293.3%61.4%Claude Opus 5.5
Chess puzzles67.0%41.0%Claude Opus 5.5
Mystery game puzzles71.0%29.0%Claude Opus 5.5
EBR-bench71.4%Not measuredOnly Claude Opus 5.5 measured
LMArena Text: hard prompts15361415Claude Opus 5.5
LMArena Text: expert15491439Claude Opus 5.5
LMArena Text: hard prompts in English15351427Claude Opus 5.5
LMArena Vision: diagrams13451254Claude Opus 5.5
LMArena Vision: homework13621309Claude Opus 5.5
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5.5 and Grok 4.7
BenchmarkClaude Opus 5.5Grok 4.7Leader
OTIS Mock AIME100.0%98.1%Claude Opus 5.5
FrontierMath, tiers 1 to 391.2%53.0%Claude Opus 5.5
FrontierMath, tier 495.0%17.1%Claude Opus 5.5
ProofBench100.0%26.0%Claude Opus 5.5
LMArena Text: math15181414Claude Opus 5.5
LMArena Text: mathematical work15161435Claude Opus 5.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
Knowledge benchmarks for Claude Opus 5.5 and Grok 4.7
BenchmarkClaude Opus 5.5Grok 4.7Leader
LegalBench (Vals AI)Not measured84.4%Only Grok 4.7 measured
MedCode (Vals AI)49.8%49.5%Claude Opus 5.5
SimpleQA Verified72.2%56.0%Claude Opus 5.5
LMArena Text: science15241419Claude Opus 5.5
LMArena Text: medicine and healthcare15091395Claude Opus 5.5
LMArena Text: legal and government15181423Claude Opus 5.5
LMArena Text: business and finance14941389Claude Opus 5.5
Neither model has a result on the other 10 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Claude Opus 5.5 and Grok 4.7
BenchmarkClaude Opus 5.5Grok 4.7Leader
Design Arena: websites13351255Claude Opus 5.5
Design Arena: UI components13901271Claude Opus 5.5
Design Arena: game dev14571314Claude Opus 5.5
Design Arena: data viz13971227Claude Opus 5.5
Design Arena: 3D14771269Claude Opus 5.5
Design Arena: all code categories13901271Claude Opus 5.5
Design Arena: SVG1332Not measuredOnly Claude Opus 5.5 measured
LiveBench design86.9%78.0%Claude Opus 5.5
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index270
General benchmarks for Claude Opus 5.5 and Grok 4.7
BenchmarkClaude Opus 5.5Grok 4.7Leader
Vals Index70.2%58.6%Claude Opus 5.5
LiveBench data analysis80.3%76.9%Claude Opus 5.5
Public Benefits Bench (Vals AI)70.6%65.6%Claude Opus 5.5
SAGE (Vals AI)45.8%40.8%Claude Opus 5.5
MedScribe (Vals AI)91.4%89.4%Claude Opus 5.5
Long context reasoning (AA-LCR)84.7%80.0%Claude Opus 5.5
DTBench98.9%96.0%Claude Opus 5.5
LMCA68.2%49.4%Claude Opus 5.5
Furniture assembly83.3%20.8%Claude Opus 5.5
LMArena Text15161399Claude Opus 5.5
LMArena Text: instruction following15371406Claude Opus 5.5
LMArena Text: creative writing15351381Claude Opus 5.5
LMArena Vision13211231Claude Opus 5.5
LMArena Text: English15191411Claude Opus 5.5
LMArena Text: non-English15071386Claude Opus 5.5
LMArena Text: Chinese15821449Claude Opus 5.5
LMArena Text: GermanNot measured1366Only Grok 4.7 measured
LMArena Text: Japanese15341359Claude Opus 5.5
LMArena Text: KoreanNot measured1383Only Grok 4.7 measured
LMArena Text: French14931431Claude Opus 5.5
LMArena Text: Spanish15081406Claude Opus 5.5
LMArena Text: Russian15171399Claude Opus 5.5
LMArena Text: PolishNot measured1420Only Grok 4.7 measured
LMArena Text: multi-turn15011394Claude Opus 5.5
LMArena Text: longer queries15321416Claude Opus 5.5
LMArena Text: writing and language15321394Claude Opus 5.5
LMArena Text: entertainment and media15151376Claude Opus 5.5
LMArena Vision: English13171229Claude Opus 5.5
LMArena Vision: ChineseNot measured1250Only Grok 4.7 measured
LMArena Vision: reading text13261241Claude Opus 5.5
LMArena Vision: creative writing13201217Claude Opus 5.5
Neither model has a result on the other 15 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 5.5 and Grok 4.7
BenchmarkClaude Opus 5.5Grok 4.7Leader
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 5.5$0.014Fits in one request
Grok 4.7$0.0050Fits in one request

Grok 4.7 costs less

Repository review

50K input + 3K output tokens

Claude Opus 5.5$0.260Fits in one request
Grok 4.7$0.118Fits in one request

Grok 4.7 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5.5$1.00Fits in one request
Grok 4.7$0.460Fits in one request

Grok 4.7 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 5.5 and Grok 4.7
SpecificationAnthropic Claude Opus 5.5SpaceXAI Grok 4.7
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 22, 2026September 21, 2026
Context window1M500K
Input $/Mtok$4.00$2.00
Output $/Mtok$20.00$6.00
Coding index92.275.0
Independent measurements behind it22
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5.5 better than Grok 4.7 for coding?

Pick Claude Opus 5.5 for coding: it scores 92.2 on the Vibe Coding Index against 75.0 for Grok 4.7. Pick Grok 4.7 when output tokens cost 3.3x less, or when what matters is LiveBench research or Harvey's Legal Agent Benchmark (Vals AI), where it leads.

Which is cheaper, Claude Opus 5.5 or Grok 4.7?

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens; Grok 4.7 costs $2.00 and $6.00. Cost per solved task is known for neither of them.

Which has the bigger context window, Claude Opus 5.5 or Grok 4.7?

Claude Opus 5.5, with 1M tokens against 500K.

How many benchmarks is the Claude Opus 5.5 vs Grok 4.7 comparison based on?

94 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5.5's coding index rests on 2 independent benchmarks and Grok 4.7's on 2. Where only one model has a result, the page says so instead of naming a winner.

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