GPT-4o (2024-11-20) vs Grok 4.20

Grok 4.20 leads GPT-4o (2024-11-20) on the Artificial Analysis Intelligence Index, 25.7 to 8.4, and Grok 4.20 costs 4.0x less per output token ($2.50 vs $10.00 per million). Updated October 23, 2026; 12 benchmarks have a result for both.

Replace GPT-4o (2024-11-20) Replace Grok 4.20

GPT-4o (2024-11-20)OpenAI

Coding: No data
Overall: No data
Output $/M: $10.00

Grok 4.20xAI

Coding: 33.3
Overall: 41.0
Output $/M: $2.50

vs boards won of 12 shared

GPT-4o (2024-11-20) or Grok 4.20: which to pick

Only Grok 4.20 has a coding score, 33.3 on the Vibe Coding Index; GPT-4o (2024-11-20) has none, so the two cannot be ranked on coding.

Pick GPT-4o (2024-11-20) for work measured by LegalBench (Vals AI) or CaseLaw (Vals AI), where it leads.

Model AGPT-4o (2024-11-20)OpenAINot benchmarkedNo coding benchmarkNo cost per solved task Model BGrok 4.20xAI33.3/1002 independent benchmarks$0.72 per solved task

121243

Shared results: 12
GPT-4o (2024-11-20) only: 12
Grok 4.20 only: 43
Like-for-like categories: 5 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.

Coding
Vibe Coding Index, six public coding benchmarks
No call
Only Grok 4.20 has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Grok 4.20
Grok 4.20 leads, 25.7 against 8.4.
Same board, both measured
Reasoning
GPQA Diamond
Grok 4.20
Grok 4.20 leads, 88.6% against 53.8%.
Same board, both measured
Math
AIME
Grok 4.20
Grok 4.20 leads, 96.5% against 11.9%.
Same board, both measured
Knowledge
MMLU Pro
Grok 4.20
Grok 4.20 leads, 86.3% against 72.6%.
Same board, both measured
Web design
Design Arena: websites
No call
Only Grok 4.20 has a Design Arena: websites result, 1229.
Directional only
Long documents
Listed context window
Grok 4.20
Grok 4.20 takes 2M tokens against 128K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Grok 4.20
GPT-4o (2024-11-20) $0.0075, Grok 4.20 $0.0025 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Grok 4.20 has the number, $0.72.
Directional only

At a glance

Coding index: GPT-4o (2024-11-20) not benchmarked, Grok 4.20 33.3 from 2 benchmarks.
Widest category: Math, 84.6 points apart on average over 1 shared benchmark.
Widest single gap: AIME: GPT-4o (2024-11-20) 11.9% against Grok 4.20 96.5%, 84.6 points apart on a 0 to 100 scale.
Output price: GPT-4o (2024-11-20) $10.00 against Grok 4.20 $2.50 per million output tokens, 4.0x apart.
Context window: GPT-4o (2024-11-20) takes 128K tokens, Grok 4.20 2M.

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
Category	GPT-4o (2024-11-20)	Grok 4.20
Coding	0	2
Intelligence	0	1
Reasoning	0	2
Math	0	1
Knowledge	4	2
All shared boards	4	8

CodingLike-for-likeSix of these boards feed the Vibe Coding Index02

Coding benchmarks for GPT-4o (2024-11-20) and Grok 4.20
Benchmark	GPT-4o (2024-11-20)	Grok 4.20	Leader
Aider polyglot	18.2%	Not measured	Only GPT-4o (2024-11-20) measured
LiveCodeBench (Vals AI)	43.4%	84.3%	Grok 4.20
SWE-bench Verified (Vals AI)	Not measured	72.2%	Only Grok 4.20 measured
Vibe Code Bench (Vals AI)	Not measured	4.1%	Only Grok 4.20 measured
Code migration (Vals AI)	Not measured	0.3%	Only Grok 4.20 measured
Terminal-Bench 2.1 (Vals AI)	Not measured	44.2%	Only Grok 4.20 measured
Terminal-Bench Hard (Artificial Analysis run)	Not measured	37.9%	Only Grok 4.20 measured
Terminal-Bench	Not measured	57.3%	Only Grok 4.20 measured
GSO-Bench	0.0%	Not measured	Only GPT-4o (2024-11-20) measured
WeirdML	25.1%	52.3%	Grok 4.20
Cybench	12.5%	Not measured	Only GPT-4o (2024-11-20) measured
Neither model has a result on the other 32 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01

Intelligence benchmarks for GPT-4o (2024-11-20) and Grok 4.20
Benchmark	GPT-4o (2024-11-20)	Grok 4.20	Leader
AA Intelligence Index	8.4	25.7	Grok 4.20
Epoch Capabilities Index	Not measured	152.1	Only Grok 4.20 measured

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index13 boards, none shared

Agentic work benchmarks for GPT-4o (2024-11-20) and Grok 4.20
Benchmark	GPT-4o (2024-11-20)	Grok 4.20	Leader
Design Arena: agents building web apps	Not measured	1144	Only Grok 4.20 measured
Design Arena: agents building full-stack apps	Not measured	1054	Only Grok 4.20 measured
Design Arena: agents building mobile apps	Not measured	1090	Only Grok 4.20 measured
Design Arena: agents building Android apps	Not measured	1045	Only Grok 4.20 measured
Design Arena: agents building Godot games	Not measured	1089	Only Grok 4.20 measured
Design Arena: HTML slides	Not measured	1180	Only Grok 4.20 measured
Finance Agent (Vals AI)	Not measured	28.5%	Only Grok 4.20 measured
Tax Agent Bench (Vals AI)	Not measured	7.0%	Only Grok 4.20 measured
Legal Research Bench (Vals AI)	Not measured	13.9%	Only Grok 4.20 measured
Excel Modeling Benchmark (Vals AI)	Not measured	11.7%	Only Grok 4.20 measured
τ²-Bench Telecom	Not measured	93.0%	Only Grok 4.20 measured
TheAgentCompany	8.6%	Not measured	Only GPT-4o (2024-11-20) measured
Vending-Bench 2	Not measured	$4,663	Only Grok 4.20 measured
Neither model has a result on the other 29 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index02

Reasoning benchmarks for GPT-4o (2024-11-20) and Grok 4.20
Benchmark	GPT-4o (2024-11-20)	Grok 4.20	Leader
GPQA Diamond	53.8%	88.6%	Grok 4.20
MMMU Pro (Vals AI)	62.2%	83.5%	Grok 4.20
GPQA Diamond (Artificial Analysis run)	Not measured	91.1%	Only Grok 4.20 measured
Humanity's Last Exam (Artificial Analysis run)	Not measured	34.5%	Only Grok 4.20 measured
GPQA Diamond (Epoch AI run)	47.9%	Not measured	Only GPT-4o (2024-11-20) measured
ARC-AGI	Not measured	89.5%	Only Grok 4.20 measured
ARC-AGI-2	Not measured	65.1%	Only Grok 4.20 measured
VPCT	40.0%	Not measured	Only GPT-4o (2024-11-20) measured
Kagi LLM Benchmark	Not measured	75.0%	Only Grok 4.20 measured
Neither model has a result on the other 14 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index01

Math benchmarks for GPT-4o (2024-11-20) and Grok 4.20
Benchmark	GPT-4o (2024-11-20)	Grok 4.20	Leader
AIME	11.9%	96.5%	Grok 4.20
MATH 500 (Vals AI)	74.0%	Not measured	Only GPT-4o (2024-11-20) measured
MGSM (Vals AI)	90.4%	Not measured	Only GPT-4o (2024-11-20) measured
OTIS Mock AIME	6.3%	Not measured	Only GPT-4o (2024-11-20) measured
MATH level 5	49.8%	Not measured	Only GPT-4o (2024-11-20) measured
Neither model has a result on the other 9 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index42

Knowledge benchmarks for GPT-4o (2024-11-20) and Grok 4.20
Benchmark	GPT-4o (2024-11-20)	Grok 4.20	Leader
MMLU Pro	72.6%	86.3%	Grok 4.20
LegalBench (Vals AI)	82.2%	77.7%	GPT-4o (2024-11-20)
CaseLaw (Vals AI)	59.7%	54.4%	GPT-4o (2024-11-20)
CorpFin (Vals AI)	45.9%	63.7%	Grok 4.20
TaxEval (Vals AI)	74.5%	74.1%	GPT-4o (2024-11-20)
MortgageTax (Vals AI)	57.4%	45.4%	GPT-4o (2024-11-20)
MedQA (Vals AI)	Not measured	94.5%	Only Grok 4.20 measured
MedCode (Vals AI)	Not measured	32.2%	Only Grok 4.20 measured
GeoBench	71.0%	Not measured	Only GPT-4o (2024-11-20) measured
Neither model has a result on the other 11 boards here

Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared

Web design benchmarks for GPT-4o (2024-11-20) and Grok 4.20
Benchmark	GPT-4o (2024-11-20)	Grok 4.20	Leader
Design Arena: websites	Not measured	1229	Only Grok 4.20 measured
Design Arena: UI components	Not measured	1197	Only Grok 4.20 measured
Design Arena: game dev	Not measured	1193	Only Grok 4.20 measured
Design Arena: data viz	Not measured	1217	Only Grok 4.20 measured
Design Arena: 3D	Not measured	1193	Only Grok 4.20 measured
Design Arena: all code categories	Not measured	1221	Only Grok 4.20 measured
Design Arena: SVG	Not measured	1165	Only Grok 4.20 measured
Design Arena: ASCII art	Not measured	1175	Only Grok 4.20 measured
Neither model has a result on the other 1 board here

GeneralDirectional onlyPublic boards, shown as published, kept out of the index10 boards, none shared

General benchmarks for GPT-4o (2024-11-20) and Grok 4.20
Benchmark	GPT-4o (2024-11-20)	Grok 4.20	Leader
SAGE (Vals AI)	Not measured	38.2%	Only Grok 4.20 measured
MedScribe (Vals AI)	Not measured	63.4%	Only Grok 4.20 measured
Vals Multimodal Index	Not measured	39.1%	Only Grok 4.20 measured
IFBench	Not measured	81.2%	Only Grok 4.20 measured
Long context reasoning (AA-LCR)	Not measured	69.0%	Only Grok 4.20 measured
DTBench	Not measured	90.1%	Only Grok 4.20 measured
LMCA	Not measured	38.7%	Only Grok 4.20 measured
Creative writing (Lech Mazur)	81.8%	Not measured	Only GPT-4o (2024-11-20) measured
CL-bench	Not measured	22.2%	Only Grok 4.20 measured
CL-bench Life	Not measured	11.9%	Only Grok 4.20 measured
Neither model has a result on the other 38 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for GPT-4o (2024-11-20) and Grok 4.20
Benchmark	GPT-4o (2024-11-20)	Grok 4.20	Leader
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-4o (2024-11-20)$0.0075Fits in one request

Grok 4.20$0.0025Fits in one request

Grok 4.20 costs less

Repository review

50K input + 3K output tokens

GPT-4o (2024-11-20)$0.155Fits in one request

Grok 4.20$0.070Fits in one request

Grok 4.20 costs less

Agent loop

200K input + 10K output tokens

GPT-4o (2024-11-20)$0.600Exceeds the context window

Grok 4.20$0.275Fits in one request

Grok 4.20 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-4o (2024-11-20) and Grok 4.20
Specification	OpenAI GPT-4o (2024-11-20)	SpaceXAI Grok 4.20
Maker	OpenAI	xAI
Weights	No public weights listed	No public weights listed
Released	November 20, 2024	March 31, 2026
Context window	128K	2M
Input $/Mtok	$2.50	$1.25
Output $/Mtok	$10.00	$2.50
Coding index	Not benchmarked	33.3
Independent measurements behind it	0	2
Cost per solved task	Not computable	$0.72
Source	OpenRouter listing	OpenRouter listing

Questions

Is GPT-4o (2024-11-20) better than Grok 4.20 for coding?

Only Grok 4.20 has a coding score, 33.3 on the Vibe Coding Index; GPT-4o (2024-11-20) has none, so the two cannot be ranked on coding. Pick GPT-4o (2024-11-20) for work measured by LegalBench (Vals AI) or CaseLaw (Vals AI), where it leads.

Which is cheaper, GPT-4o (2024-11-20) or Grok 4.20?

GPT-4o (2024-11-20) costs $2.50 per million input tokens and $10.00 per million output tokens; Grok 4.20 costs $1.25 and $2.50. Cost per solved task is known for Grok 4.20 only.

Which has the bigger context window, GPT-4o (2024-11-20) or Grok 4.20?

Grok 4.20, with 2M tokens against 128K.

How many benchmarks is the GPT-4o (2024-11-20) vs Grok 4.20 comparison based on?

12 benchmarks have a result for both models as of October 23, 2026. GPT-4o (2024-11-20)'s coding index rests on 0 independent benchmarks and Grok 4.20's on 2. Where only one model has a result, the page says so instead of naming a winner.

GPT-4o (2024-11-20) or Grok 4.20: which to pick

Which one for your work

Coding

Intelligence

Reasoning

Math

Knowledge

Web design

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

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