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GPT-5.1 vs Grok 4.6

Updated October 21, 2026. 79 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.1 Replace Grok 4.6
GPT-5.1OpenAI
Coding
53.3
Overall
24.7
Output $/M
$10.00
27
Grok 4.6xAI
Coding
76.4
Overall
44.3
Output $/M
$6.00
52
vs boards won of 79 shared

Decision reading

Pick Grok 4.6 for coding: it scores 76.4 on the Vibe Coding Index against 53.3 for GPT-5.1.

Pick GPT-5.1 when what matters is Chess puzzles or LMArena Text: hard prompts, where it leads.

Model AGPT-5.1OpenAI53.3/1002 independent benchmarks$1.02 per solved taskModel BGrok 4.6xAI76.4/1002 independent benchmarks$0.82 per solved task
Shared results
79
GPT-5.1 only
21
Grok 4.6 only
44
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
GPT-5.1 53.3 from 2 benchmarks, Grok 4.6 76.4 from 2 benchmarks.
Widest category
Agentic work, 47.3 points apart on average over 1 shared benchmark.
Widest single gap
Vibe Code Bench (Vals AI): GPT-5.1 24.6% against Grok 4.6 76.2%, 51.6 points apart on a 0 to 100 scale.
Output price
GPT-5.1 $10.00 against Grok 4.6 $6.00 per million output tokens, 1.7x apart.
Context window
GPT-5.1 takes 400K tokens, Grok 4.6 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
CategoryGPT-5.1BarsGrok 4.6Ties
Coding011
Intelligence02
Agentic work01
Reasoning410
Math12
Knowledge65
Web design08
General1613
All shared boards2752
CodingLike-for-likeFour of these boards feed the Vibe Coding Index011
Coding benchmarks for GPT-5.1 and Grok 4.6
BenchmarkGPT-5.1Grok 4.6Leader
SWE-bench Verified66.0%Not measuredOnly GPT-5.1 measured
LiveBench codingNot measured89.1%Only Grok 4.6 measured
LMArena WebDev13961617Grok 4.6
AA Coding Index49.476.8Grok 4.6
LiveCodeBench (Vals AI)86.5%88.2%Grok 4.6
SWE-bench Verified (Vals AI)69.8%95.6%Grok 4.6
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Grok 4.6 measured
Vibe Code Bench (Vals AI)24.6%76.2%Grok 4.6
Code migration (Vals AI)Not measured44.6%Only Grok 4.6 measured
ProgramBench (Vals AI)Not measured1.0%Only Grok 4.6 measured
IOI (Vals AI)Not measured47.6%Only Grok 4.6 measured
Terminal-Bench 2.1 (Vals AI)Not measured78.3%Only Grok 4.6 measured
Vibe Code Bench 1-100 (Vals AI)Not measured14.8%Only Grok 4.6 measured
SkillsBench (Vals AI)Not measured55.8%Only Grok 4.6 measured
CyberBench (Vals AI)Not measured67.7%Only Grok 4.6 measured
LiveCodeBench (Artificial Analysis run)86.8%Not measuredOnly GPT-5.1 measured
SciCodeNot measured56.5%Only Grok 4.6 measured
Terminal-Bench Hard (Artificial Analysis run)45.5%Not measuredOnly GPT-5.1 measured
Terminal-Bench47.6%Not measuredOnly GPT-5.1 measured
FrontierCodeNot measured48.0%Only Grok 4.6 measured
FrontierSWENot measured25.3%Only Grok 4.6 measured
GSO-Bench13.7%Not measuredOnly GPT-5.1 measured
WeirdML60.8%67.3%Grok 4.6
ALE-BenchNot measured1508.1Only Grok 4.6 measured
LMArena Text: coding14531466Grok 4.6
LMArena Text: software and IT14541457Grok 4.6
LMArena WebDev: React13071631Grok 4.6
LMArena WebDev: HTML14051597Grok 4.6
LMArena WebDev: from an image14211603Grok 4.6
Neither model has a result on the other 9 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5.1 and Grok 4.6
BenchmarkGPT-5.1Grok 4.6Leader
AA Intelligence Index24.744.3Grok 4.6
Epoch Capabilities Index149.8156.6Grok 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GPT-5.1 and Grok 4.6
BenchmarkGPT-5.1Grok 4.6Leader
AA Agentic IndexNot measured53.0Only Grok 4.6 measured
Design Arena: agents building web appsNot measured1247Only Grok 4.6 measured
Design Arena: agents building full-stack appsNot measured1264Only Grok 4.6 measured
Design Arena: agents building mobile appsNot measured1234Only Grok 4.6 measured
Design Arena: agents building Android appsNot measured1297Only Grok 4.6 measured
Design Arena: agents building Godot gamesNot measured1276Only Grok 4.6 measured
Design Arena: agents building gamesNot measured1208Only Grok 4.6 measured
Design Arena: HTML slidesNot measured1249Only Grok 4.6 measured
Design Arena: PowerPoint slidesNot measured1241Only Grok 4.6 measured
LiveBench researchNot measured84.5%Only Grok 4.6 measured
LiveBench browserNot measured64.0%Only Grok 4.6 measured
LiveBench long agenticNot measured40.7%Only Grok 4.6 measured
Finance Agent (Vals AI)Not measured53.7%Only Grok 4.6 measured
Tax Agent Bench (Vals AI)Not measured33.1%Only Grok 4.6 measured
Legal Research Bench (Vals AI)Not measured48.1%Only Grok 4.6 measured
Excel Modeling Benchmark (Vals AI)Not measured62.7%Only Grok 4.6 measured
BioMysteryBench (Vals AI)Not measured72.2%Only Grok 4.6 measured
Terminal-Bench-Science (Vals AI)Not measured11.4%Only Grok 4.6 measured
Vals Science IndexNot measured38.1%Only Grok 4.6 measured
Time Horizon Index (Vals AI)Not measured5.8%Only Grok 4.6 measured
τ²-Bench Telecom81.9%Not measuredOnly GPT-5.1 measured
APEX-AgentsNot measured65.3%Only Grok 4.6 measured
DeepResearch Bench42.8%Not measuredOnly GPT-5.1 measured
Vending-Bench 2$1,473$9,047Grok 4.6
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index410
Reasoning benchmarks for GPT-5.1 and Grok 4.6
BenchmarkGPT-5.1Grok 4.6Leader
GPQA Diamond86.6%94.7%Grok 4.6
LiveBench reasoningNot measured91.2%Only Grok 4.6 measured
MysteryMechanism (Vals AI)Not measured30.6%Only Grok 4.6 measured
MMMU Pro (Vals AI)83.2%Not measuredOnly GPT-5.1 measured
GPQA Diamond (Artificial Analysis run)87.3%94.9%Grok 4.6
Humanity's Last Exam (Artificial Analysis run)28.5%44.1%Grok 4.6
GPQA Diamond (Epoch AI run)87.6%94.0%Grok 4.6
ARC-AGI72.8%87.5%Grok 4.6
ARC-AGI-217.6%67.1%Grok 4.6
SimpleBench53.2%75.9%Grok 4.6
Chess puzzles42.0%33.0%GPT-5.1
Mystery game puzzles19.0%34.0%Grok 4.6
EBR-benchNot measured30.5%Only Grok 4.6 measured
VPCT58.7%Not measuredOnly GPT-5.1 measured
LMArena Text: hard prompts14571448GPT-5.1
LMArena Text: expert14701469GPT-5.1
LMArena Text: hard prompts in English14621445GPT-5.1
LMArena Vision: diagrams12641285Grok 4.6
LMArena Vision: homework12721283Grok 4.6
Neither model has a result on the other 2 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index12
Math benchmarks for GPT-5.1 and Grok 4.6
BenchmarkGPT-5.1Grok 4.6Leader
AIME93.3%Not measuredOnly GPT-5.1 measured
MGSM (Vals AI)93.0%Not measuredOnly GPT-5.1 measured
AA Math Index94.0Not measuredOnly GPT-5.1 measured
AIME 2025 (Artificial Analysis run)94.0%Not measuredOnly GPT-5.1 measured
OTIS Mock AIME88.6%99.2%Grok 4.6
FrontierMath, tiers 1 to 3Not measured66.0%Only Grok 4.6 measured
FrontierMath, tier 4Not measured31.7%Only Grok 4.6 measured
ProofBenchNot measured51.0%Only Grok 4.6 measured
LMArena Text: math14461417GPT-5.1
LMArena Text: mathematical work14491464Grok 4.6
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index65
Knowledge benchmarks for GPT-5.1 and Grok 4.6
BenchmarkGPT-5.1Grok 4.6Leader
MMLU Pro86.4%89.4%Grok 4.6
LegalBench (Vals AI)85.7%86.3%Grok 4.6
CaseLaw (Vals AI)73.4%Not measuredOnly GPT-5.1 measured
CorpFin (Vals AI)63.8%66.2%Grok 4.6
TaxEval (Vals AI)74.9%71.1%GPT-5.1
MortgageTax (Vals AI)61.4%64.2%Grok 4.6
MedQA (Vals AI)96.4%Not measuredOnly GPT-5.1 measured
MedCode (Vals AI)52.7%44.7%GPT-5.1
MMLU Pro (Artificial Analysis run)87.0%Not measuredOnly GPT-5.1 measured
SimpleQA Verified48.0%49.3%Grok 4.6
LMArena Text: science14591437GPT-5.1
LMArena Text: medicine and healthcare14561420GPT-5.1
LMArena Text: legal and government14591429GPT-5.1
LMArena Text: business and finance14311416GPT-5.1
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for GPT-5.1 and Grok 4.6
BenchmarkGPT-5.1Grok 4.6Leader
Design Arena: websites11871289Grok 4.6
Design Arena: UI components11661294Grok 4.6
Design Arena: game dev11791296Grok 4.6
Design Arena: data viz12041283Grok 4.6
Design Arena: 3D10611277Grok 4.6
Design Arena: all code categories11711292Grok 4.6
Design Arena: SVG11491239Grok 4.6
Design Arena: ASCII art11181278Grok 4.6
LiveBench designNot measured79.8%Only Grok 4.6 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index1613
General benchmarks for GPT-5.1 and Grok 4.6
BenchmarkGPT-5.1Grok 4.6Leader
LiveBench data analysisNot measured75.3%Only Grok 4.6 measured
Public Benefits Bench (Vals AI)Not measured66.8%Only Grok 4.6 measured
SAGE (Vals AI)43.2%28.9%GPT-5.1
MedScribe (Vals AI)88.1%86.5%GPT-5.1
IFBench72.9%Not measuredOnly GPT-5.1 measured
Long context reasoning (AA-LCR)80.0%81.0%Grok 4.6
DTBench90.1%97.3%Grok 4.6
LMCA43.9%48.5%Grok 4.6
CL-bench23.7%Not measuredOnly GPT-5.1 measured
Furniture assemblyNot measured40.0%Only Grok 4.6 measured
CL-bench Life17.3%Not measuredOnly GPT-5.1 measured
LMArena Text14431429GPT-5.1
LMArena Text: instruction following14431431GPT-5.1
LMArena Text: creative writing14271426GPT-5.1
LMArena Vision12501263Grok 4.6
LMArena Text: English14511433GPT-5.1
LMArena Text: non-English14311420GPT-5.1
LMArena Text: Chinese14951476GPT-5.1
LMArena Text: German14381426GPT-5.1
LMArena Text: Japanese14531378GPT-5.1
LMArena Text: Korean14011391GPT-5.1
LMArena Text: French14501455Grok 4.6
LMArena Text: Spanish14331414GPT-5.1
LMArena Text: Russian14351421GPT-5.1
LMArena Text: Polish14401430GPT-5.1
LMArena Text: multi-turn14501425GPT-5.1
LMArena Text: longer queries14481456Grok 4.6
LMArena Text: writing and language14281429Grok 4.6
LMArena Text: entertainment and media14151421Grok 4.6
LMArena Vision: English12521270Grok 4.6
LMArena Vision: Chinese12701289Grok 4.6
LMArena Vision: reading text12551272Grok 4.6
LMArena Vision: humor12631270Grok 4.6
LMArena Vision: captioning1252Not measuredOnly GPT-5.1 measured
LMArena Vision: recognizing things1232Not measuredOnly GPT-5.1 measured
LMArena Vision: creative writing12661262GPT-5.1
LMArena Document14031452Grok 4.6
Neither model has a result on the other 9 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.1 and Grok 4.6
BenchmarkGPT-5.1Grok 4.6Leader
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

GPT-5.1$0.0063Fits in one request
Grok 4.6$0.0050Fits in one request

Grok 4.6 costs less

Repository review

50K input + 3K output tokens

GPT-5.1$0.092Fits in one request
Grok 4.6$0.118Fits in one request

GPT-5.1 costs less

Agent loop

200K input + 10K output tokens

GPT-5.1$0.350Fits in one request
Grok 4.6$0.460Fits in one request

GPT-5.1 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 GPT-5.1 and Grok 4.6
SpecificationOpenAI GPT-5.1SpaceXAI Grok 4.6
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 13, 2025August 12, 2026
Context window400K500K
Input $/Mtok$1.25$2.00
Output $/Mtok$10.00$6.00
Coding index53.376.4
Independent measurements behind it22
Cost per solved task$1.02$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1 better than Grok 4.6 for coding?

Pick Grok 4.6 for coding: it scores 76.4 on the Vibe Coding Index against 53.3 for GPT-5.1. Pick GPT-5.1 when what matters is Chess puzzles or LMArena Text: hard prompts, where it leads.

Which is cheaper, GPT-5.1 or Grok 4.6?

GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; Grok 4.6 costs $2.00 and $6.00. Per solved SWE-bench Verified task, GPT-5.1 costs $1.02 and Grok 4.6 $0.82.

Which has the bigger context window, GPT-5.1 or Grok 4.6?

Grok 4.6, with 500K tokens against 400K.

How many benchmarks is the GPT-5.1 vs Grok 4.6 comparison based on?

79 benchmarks have a result for both models as of October 21, 2026. GPT-5.1's coding index rests on 2 independent benchmarks and Grok 4.6's on 2. Where only one model has a result, the page says so instead of naming a winner.

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