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GPT-5.5 vs Grok 4.6

Updated October 21, 2026. 114 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.5 Replace Grok 4.6
GPT-5.5OpenAI
Coding
67.8
Overall
38.4
Output $/M
$30.00
65
Grok 4.6xAI
Coding
76.4
Overall
44.3
Output $/M
$6.00
49
vs boards won of 114 shared

Decision reading

Pick Grok 4.6 for coding: it scores 76.4 on the Vibe Coding Index against 67.8 for GPT-5.5.

Pick GPT-5.5 when the context window is larger, 1.05M against 500K tokens, or when what matters is Code migration (Vals AI) or SkillsBench (Vals AI), where it leads.

Model AGPT-5.5OpenAI67.8/1002 independent benchmarks$1.65 per solved taskModel BGrok 4.6xAI76.4/1002 independent benchmarks$0.82 per solved task
Shared results
114
GPT-5.5 only
18
Grok 4.6 only
9
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-5.5 67.8 from 2 benchmarks, Grok 4.6 76.4 from 2 benchmarks.
Widest category
Math, 15.5 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: GPT-5.5 72.5% against Grok 4.6 31.7%, 40.8 points apart on a 0 to 100 scale.
Output price
GPT-5.5 $30.00 against Grok 4.6 $6.00 per million output tokens, 5.0x apart.
Context window
GPT-5.5 takes 1.05M 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-5.5BarsGrok 4.6Ties
Coding613
Intelligence11
Agentic work316
Reasoning115
Math42
Knowledge101
Web design09
General302
All shared boards6549
CodingLike-for-likeFour of these boards feed the Vibe Coding Index613
Coding benchmarks for GPT-5.5 and Grok 4.6
BenchmarkGPT-5.5Grok 4.6Leader
LiveBench coding85.1%89.1%Grok 4.6
LMArena WebDev15131617Grok 4.6
AA Coding Index74.976.8Grok 4.6
LiveCodeBench (Vals AI)85.3%88.2%Grok 4.6
SWE-bench Verified (Vals AI)82.6%95.6%Grok 4.6
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Grok 4.6 measured
Vibe Code Bench (Vals AI)69.8%76.2%Grok 4.6
Code migration (Vals AI)45.2%44.6%GPT-5.5
ProgramBench (Vals AI)0.5%1.0%Grok 4.6
IOI (Vals AI)Not measured47.6%Only Grok 4.6 measured
Terminal-Bench 2.1 (Vals AI)76.4%78.3%Grok 4.6
Vibe Code Bench 1-100 (Vals AI)Not measured14.8%Only Grok 4.6 measured
SkillsBench (Vals AI)62.5%55.8%GPT-5.5
CyberBench (Vals AI)Not measured67.7%Only Grok 4.6 measured
SciCode56.1%56.5%Grok 4.6
Terminal-Bench Hard (Artificial Analysis run)60.6%Not measuredOnly GPT-5.5 measured
Terminal-Bench84.7%Not measuredOnly GPT-5.5 measured
FrontierCode43.0%48.0%Grok 4.6
FrontierSWENot measured25.3%Only Grok 4.6 measured
GSO-Bench40.2%Not measuredOnly GPT-5.5 measured
WeirdML84.9%67.3%GPT-5.5
MirrorCode10.0%Not measuredOnly GPT-5.5 measured
ALE-Bench1943.01508.1GPT-5.5
LMArena Text: coding14941466GPT-5.5
LMArena Text: software and IT14931457GPT-5.5
LMArena WebDev: React15061631Grok 4.6
LMArena WebDev: HTML15431597Grok 4.6
LMArena WebDev: from an image15321603Grok 4.6
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for GPT-5.5 and Grok 4.6
BenchmarkGPT-5.5Grok 4.6Leader
AA Intelligence Index38.444.3Grok 4.6
Epoch Capabilities Index159.7156.6GPT-5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index316
Agentic work benchmarks for GPT-5.5 and Grok 4.6
BenchmarkGPT-5.5Grok 4.6Leader
AA Agentic Index36.453.0Grok 4.6
Design Arena: agents building web apps11171247Grok 4.6
Design Arena: agents building full-stack apps10891264Grok 4.6
Design Arena: agents building mobile apps11431234Grok 4.6
Design Arena: agents building Android apps11691297Grok 4.6
Design Arena: agents building Godot games11731276Grok 4.6
Design Arena: agents building games11791208Grok 4.6
Design Arena: HTML slides10671249Grok 4.6
Design Arena: PowerPoint slides11081241Grok 4.6
LiveBench research61.6%84.5%Grok 4.6
LiveBench browser48.0%64.0%Grok 4.6
LiveBench long agentic44.6%40.7%GPT-5.5
SREBench (Vals AI)3.8%Not measuredOnly GPT-5.5 measured
Finance Agent (Vals AI)51.8%53.7%Grok 4.6
Tax Agent Bench (Vals AI)21.8%33.1%Grok 4.6
Legal Research Bench (Vals AI)40.4%48.1%Grok 4.6
Excel Modeling Benchmark (Vals AI)64.5%62.7%GPT-5.5
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)8.3%5.8%GPT-5.5
τ²-Bench Telecom93.9%Not measuredOnly GPT-5.5 measured
APEX-Agents55.1%65.3%Grok 4.6
Remote Labor Index6.3%Not measuredOnly GPT-5.5 measured
OSWorld 2.013.0%Not measuredOnly GPT-5.5 measured
DeepResearch Bench54.0%Not measuredOnly GPT-5.5 measured
PostTrainBench27.2%Not measuredOnly GPT-5.5 measured
Vending-Bench 2$7,524$9,047Grok 4.6
Neither model has a result on the other 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index115
Reasoning benchmarks for GPT-5.5 and Grok 4.6
BenchmarkGPT-5.5Grok 4.6Leader
GPQA Diamond93.2%94.7%Grok 4.6
LiveBench reasoning89.7%91.2%Grok 4.6
MysteryMechanism (Vals AI)Not measured30.6%Only Grok 4.6 measured
MMMU Pro (Vals AI)88.3%Not measuredOnly GPT-5.5 measured
GPQA Diamond (Artificial Analysis run)93.5%94.9%Grok 4.6
Humanity's Last Exam (Artificial Analysis run)45.8%44.1%GPT-5.5
GPQA Diamond (Epoch AI run)90.7%94.0%Grok 4.6
ARC-AGI95.0%87.5%GPT-5.5
ARC-AGI-285.0%67.1%GPT-5.5
SimpleBench69.0%75.9%Grok 4.6
Chess puzzles63.0%33.0%GPT-5.5
Mystery game puzzles56.0%34.0%GPT-5.5
EBR-bench34.3%30.5%GPT-5.5
LMArena Text: hard prompts14891448GPT-5.5
LMArena Text: expert15071469GPT-5.5
LMArena Text: hard prompts in English14831445GPT-5.5
LMArena Vision: diagrams13251285GPT-5.5
LMArena Vision: homework13321283GPT-5.5
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index42
Math benchmarks for GPT-5.5 and Grok 4.6
BenchmarkGPT-5.5Grok 4.6Leader
OTIS Mock AIME84.4%99.2%Grok 4.6
FrontierMath, tiers 1 to 385.3%66.0%GPT-5.5
FrontierMath, tier 472.5%31.7%GPT-5.5
ProofBench50.0%51.0%Grok 4.6
LMArena Text: math14871417GPT-5.5
LMArena Text: mathematical work14961464GPT-5.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index101
Knowledge benchmarks for GPT-5.5 and Grok 4.6
BenchmarkGPT-5.5Grok 4.6Leader
MMLU Pro88.1%89.4%Grok 4.6
LegalBench (Vals AI)86.5%86.3%GPT-5.5
CaseLaw (Vals AI)66.2%Not measuredOnly GPT-5.5 measured
CorpFin (Vals AI)68.4%66.2%GPT-5.5
TaxEval (Vals AI)75.0%71.1%GPT-5.5
MortgageTax (Vals AI)68.8%64.2%GPT-5.5
MedCode (Vals AI)49.1%44.7%GPT-5.5
SimpleQA Verified63.0%49.3%GPT-5.5
LMArena Text: science14851437GPT-5.5
LMArena Text: medicine and healthcare14651420GPT-5.5
LMArena Text: legal and government14911429GPT-5.5
LMArena Text: business and finance14781416GPT-5.5
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index09
Web design benchmarks for GPT-5.5 and Grok 4.6
BenchmarkGPT-5.5Grok 4.6Leader
Design Arena: websites12561289Grok 4.6
Design Arena: UI components12601294Grok 4.6
Design Arena: game dev12941296Grok 4.6
Design Arena: data viz12651283Grok 4.6
Design Arena: 3D11981277Grok 4.6
Design Arena: all code categories12601292Grok 4.6
Design Arena: SVG12341239Grok 4.6
Design Arena: ASCII art12541278Grok 4.6
LiveBench design70.3%79.8%Grok 4.6
GeneralLike-for-likePublic boards, shown as published, kept out of the index302
General benchmarks for GPT-5.5 and Grok 4.6
BenchmarkGPT-5.5Grok 4.6Leader
LiveBench data analysis81.6%75.3%GPT-5.5
Public Benefits Bench (Vals AI)60.9%66.8%Grok 4.6
SAGE (Vals AI)51.5%28.9%GPT-5.5
MedScribe (Vals AI)86.9%86.5%GPT-5.5
Vals Multimodal Index68.1%Not measuredOnly GPT-5.5 measured
IFBench75.9%Not measuredOnly GPT-5.5 measured
Long context reasoning (AA-LCR)84.3%81.0%GPT-5.5
DTBench96.0%97.3%Grok 4.6
LMCA54.3%48.5%GPT-5.5
Surface Evolver Bench88.1%Not measuredOnly GPT-5.5 measured
Furniture assembly44.2%40.0%GPT-5.5
ExploitBench47.4%Not measuredOnly GPT-5.5 measured
CL-bench Life22.2%Not measuredOnly GPT-5.5 measured
LMArena Text14711429GPT-5.5
LMArena Text: instruction following14781431GPT-5.5
LMArena Text: creative writing14551426GPT-5.5
LMArena Vision12971263GPT-5.5
LMArena Text: English14701433GPT-5.5
LMArena Text: non-English14671420GPT-5.5
LMArena Text: Chinese15341476GPT-5.5
LMArena Text: German14801426GPT-5.5
LMArena Text: Japanese14991378GPT-5.5
LMArena Text: Korean14601391GPT-5.5
LMArena Text: French14851455GPT-5.5
LMArena Text: Spanish14681414GPT-5.5
LMArena Text: Russian14731421GPT-5.5
LMArena Text: Polish14651430GPT-5.5
LMArena Text: multi-turn14761425GPT-5.5
LMArena Text: longer queries14841456GPT-5.5
LMArena Text: writing and language14661429GPT-5.5
LMArena Text: entertainment and media14491421GPT-5.5
LMArena Vision: English12921270GPT-5.5
LMArena Vision: Chinese13601289GPT-5.5
LMArena Vision: reading text13061272GPT-5.5
LMArena Vision: humor12931270GPT-5.5
LMArena Vision: recognizing things1231Not measuredOnly GPT-5.5 measured
LMArena Vision: creative writing13011262GPT-5.5
LMArena Document14861452GPT-5.5
Neither model has a result on the other 8 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.5 and Grok 4.6
BenchmarkGPT-5.5Grok 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-5.5$0.020Fits in one request
Grok 4.6$0.0050Fits in one request

Grok 4.6 costs less

Repository review

50K input + 3K output tokens

GPT-5.5$0.340Fits in one request
Grok 4.6$0.118Fits in one request

Grok 4.6 costs less

Agent loop

200K input + 10K output tokens

GPT-5.5$1.30Fits in one request
Grok 4.6$0.460Fits in one request

Grok 4.6 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-5.5 and Grok 4.6
SpecificationOpenAI GPT-5.5SpaceXAI Grok 4.6
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedApril 24, 2026August 12, 2026
Context window1.05M500K
Input $/Mtok$5.00$2.00
Output $/Mtok$30.00$6.00
Coding index67.876.4
Independent measurements behind it22
Cost per solved task$1.65$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.5 better than Grok 4.6 for coding?

Pick Grok 4.6 for coding: it scores 76.4 on the Vibe Coding Index against 67.8 for GPT-5.5. Pick GPT-5.5 when the context window is larger, 1.05M against 500K tokens, or when what matters is Code migration (Vals AI) or SkillsBench (Vals AI), where it leads.

Which is cheaper, GPT-5.5 or Grok 4.6?

GPT-5.5 costs $5.00 per million input tokens and $30.00 per million output tokens; Grok 4.6 costs $2.00 and $6.00. Per solved SWE-bench Verified task, GPT-5.5 costs $1.65 and Grok 4.6 $0.82.

Which has the bigger context window, GPT-5.5 or Grok 4.6?

GPT-5.5, with 1.05M tokens against 500K.

How many benchmarks is the GPT-5.5 vs Grok 4.6 comparison based on?

114 benchmarks have a result for both models as of October 21, 2026. GPT-5.5'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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