GPT-5.1 vs GPT-6.1 Sol

GPT-6.1 Sol leads GPT-5.1 on coding, 82.4 to 40.4 on the Vibe Coding Index, at about the same output price ($10.00 vs $10.00 per million). Updated October 22, 2026; 58 benchmarks have a result for both.

Replace GPT-5.1 Replace GPT-6.1 Sol

GPT-5.1OpenAI

Coding: 40.4
Overall: 55.0
Output $/M: $10.00

GPT-6.1 SolOpenAI

Coding: 82.4
Overall: 81.4
Output $/M: $10.00

vs boards won of 58 shared

GPT-5.1 or GPT-6.1 Sol: which to pick

Pick GPT-6.1 Sol for coding: it scores 82.4 on the Vibe Coding Index against 40.4 for GPT-5.1.

Pick GPT-5.1 for work measured by MedCode (Vals AI) or LMArena Text: science, where it leads.

Model AGPT-5.1OpenAI40.4/1003 independent benchmarks$1.02 per solved task Model BGPT-6.1 SolOpenAI82.4/1005 independent benchmarksNo cost per solved task

584340

Shared results: 58
GPT-5.1 only: 43
GPT-6.1 Sol only: 40
Like-for-like categories: 7 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
GPT-6.1 Sol
GPT-6.1 Sol scores 82.4 against 40.4.
3 and 5 benchmarks behind the scores
Intelligence
AA Intelligence Index
GPT-6.1 Sol
GPT-6.1 Sol leads, 51.8 against 24.7.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only GPT-5.1 has a GPQA Diamond result, 86.6%.
Directional only
Math
AIME
No call
Only GPT-5.1 has a AIME result, 93.3%.
Directional only
Knowledge
MMLU Pro
No call
Only GPT-5.1 has a MMLU Pro result, 86.4%.
Directional only
Web design
Design Arena: websites
GPT-6.1 Sol
GPT-6.1 Sol leads, 1321 against 1187.
Same board, both measured
General
Vals Index
No call
Only GPT-6.1 Sol has a Vals Index result, 63.9%.
Directional only
Long documents
Listed context window
GPT-6.1 Sol
GPT-6.1 Sol takes 1.05M tokens against 400K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
GPT-5.1
GPT-5.1 $0.0063, GPT-6.1 Sol $0.0070 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only GPT-5.1 has the number, $1.02.
Directional only

At a glance

Coding index: GPT-5.1 40.4 from 3 benchmarks, GPT-6.1 Sol 82.4 from 5 benchmarks.
Widest category: Coding, 33.5 points apart on average over 7 shared benchmarks.
Widest single gap: ARC-AGI-2: GPT-5.1 17.6% against GPT-6.1 Sol 94.2%, 76.5 points apart on a 0 to 100 scale.
Output price: Both cost $10.00 per million output tokens.
Context window: GPT-5.1 takes 400K tokens, GPT-6.1 Sol 1.05M.

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-5.1	GPT-6.1 Sol
Coding	0	7
Intelligence	0	2
Reasoning	0	11
Math	0	3
Knowledge	3	4
Web design	0	6
General	5	17
All shared boards	8	50

CodingLike-for-likeSix of these boards feed the Vibe Coding Index07

Coding benchmarks for GPT-5.1 and GPT-6.1 Sol
Benchmark	GPT-5.1	GPT-6.1 Sol	Leader
SWE-bench Verified	66.0%	Not measured	Only GPT-5.1 measured
LiveBench coding	Not measured	96.0%	Only GPT-6.1 Sol measured
LMArena WebDev	1396	1753	GPT-6.1 Sol
AA Coding Index	49.4	Not measured	Only GPT-5.1 measured
LiveCodeBench (Vals AI)	86.5%	Not measured	Only GPT-5.1 measured
SWE-bench Verified (Vals AI)	69.8%	Not measured	Only GPT-5.1 measured
Terminal-Bench 4 (Vals AI)	Not measured	55.0%	Only GPT-6.1 Sol measured
Vibe Code Bench (Vals AI)	24.6%	88.9%	GPT-6.1 Sol
Code migration (Vals AI)	Not measured	65.1%	Only GPT-6.1 Sol measured
ProgramBench (Vals AI)	Not measured	3.0%	Only GPT-6.1 Sol measured
IOI (Vals AI)	Not measured	96.9%	Only GPT-6.1 Sol measured
SWE-bench Multimodal (Vals AI)	Not measured	43.5%	Only GPT-6.1 Sol measured
CyberBench (Vals AI)	Not measured	39.3%	Only GPT-6.1 Sol measured
LiveCodeBench (Artificial Analysis run)	86.8%	Not measured	Only GPT-5.1 measured
SciCode	Not measured	55.8%	Only GPT-6.1 Sol measured
Terminal-Bench Hard (Artificial Analysis run)	45.5%	Not measured	Only GPT-5.1 measured
Terminal-Bench	47.6%	Not measured	Only GPT-5.1 measured
FrontierCode	Not measured	50.2%	Only GPT-6.1 Sol measured
GSO-Bench	13.7%	Not measured	Only GPT-5.1 measured
WeirdML	60.8%	Not measured	Only GPT-5.1 measured
ALE-Bench	Not measured	2743.8	Only GPT-6.1 Sol measured
LMArena Text: coding	1453	1478	GPT-6.1 Sol
LMArena Text: software and IT	1454	1476	GPT-6.1 Sol
LMArena WebDev: React	1307	1754	GPT-6.1 Sol
LMArena WebDev: HTML	1405	1800	GPT-6.1 Sol
LMArena WebDev: from an image	1421	1702	GPT-6.1 Sol
SciCode	Not measured	9.2%	Only GPT-6.1 Sol measured
Neither model has a result on the other 12 boards here

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

Intelligence benchmarks for GPT-5.1 and GPT-6.1 Sol
Benchmark	GPT-5.1	GPT-6.1 Sol	Leader
AA Intelligence Index	24.7	51.8	GPT-6.1 Sol
Epoch Capabilities Index	149.8	168.4	GPT-6.1 Sol

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index21 boards, none shared

Agentic work benchmarks for GPT-5.1 and GPT-6.1 Sol
Benchmark	GPT-5.1	GPT-6.1 Sol	Leader
Design Arena: agents building web apps	Not measured	1306	Only GPT-6.1 Sol measured
Design Arena: agents building mobile apps	Not measured	1213	Only GPT-6.1 Sol measured
Design Arena: spreadsheets	Not measured	1259	Only GPT-6.1 Sol measured
LiveBench research	Not measured	83.5%	Only GPT-6.1 Sol measured
LiveBench browser	Not measured	88.0%	Only GPT-6.1 Sol measured
LiveBench long agentic	Not measured	73.0%	Only GPT-6.1 Sol measured
SREBench (Vals AI)	Not measured	50.8%	Only GPT-6.1 Sol measured
Finance Agent (Vals AI)	Not measured	52.0%	Only GPT-6.1 Sol measured
Tax Agent Bench (Vals AI)	Not measured	21.8%	Only GPT-6.1 Sol measured
Legal Research Bench (Vals AI)	Not measured	38.5%	Only GPT-6.1 Sol measured
Harvey's Legal Agent Benchmark (Vals AI)	Not measured	6.3%	Only GPT-6.1 Sol measured
Excel Modeling Benchmark (Vals AI)	Not measured	70.8%	Only GPT-6.1 Sol measured
BioMysteryBench (Vals AI)	Not measured	79.6%	Only GPT-6.1 Sol measured
Terminal-Bench-Science (Vals AI)	Not measured	52.9%	Only GPT-6.1 Sol measured
Vals Science Index	Not measured	59.6%	Only GPT-6.1 Sol measured
Robo-bench (Vals AI)	Not measured	28.3%	Only GPT-6.1 Sol measured
τ²-Bench Telecom	81.9%	Not measured	Only GPT-5.1 measured
APEX-Agents	Not measured	60.0%	Only GPT-6.1 Sol measured
DeepResearch Bench	42.8%	Not measured	Only GPT-5.1 measured
SpireClimb	Not measured	24.7%	Only GPT-6.1 Sol measured
Vending-Bench 2	$1,473	Not measured	Only GPT-5.1 measured
Neither model has a result on the other 20 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index011

Reasoning benchmarks for GPT-5.1 and GPT-6.1 Sol
Benchmark	GPT-5.1	GPT-6.1 Sol	Leader
GPQA Diamond	86.6%	Not measured	Only GPT-5.1 measured
LiveBench reasoning	Not measured	92.6%	Only GPT-6.1 Sol measured
MysteryMechanism (Vals AI)	Not measured	46.4%	Only GPT-6.1 Sol measured
MMMU Pro (Vals AI)	83.2%	Not measured	Only GPT-5.1 measured
GPQA Diamond (Artificial Analysis run)	87.3%	Not measured	Only GPT-5.1 measured
Humanity's Last Exam (Artificial Analysis run)	28.5%	52.9%	GPT-6.1 Sol
GPQA Diamond (Epoch AI run)	87.6%	95.4%	GPT-6.1 Sol
ARC-AGI	72.8%	98.5%	GPT-6.1 Sol
ARC-AGI-2	17.6%	94.2%	GPT-6.1 Sol
SimpleBench	53.2%	Not measured	Only GPT-5.1 measured
Chess puzzles	42.0%	68.0%	GPT-6.1 Sol
Mystery game puzzles	19.0%	80.0%	GPT-6.1 Sol
EBR-bench	Not measured	54.3%	Only GPT-6.1 Sol measured
VPCT	58.7%	Not measured	Only GPT-5.1 measured
LMArena Text: hard prompts	1457	1463	GPT-6.1 Sol
LMArena Text: expert	1470	1489	GPT-6.1 Sol
LMArena Text: hard prompts in English	1462	1465	GPT-6.1 Sol
LMArena Vision: diagrams	1264	1306	GPT-6.1 Sol
LMArena Vision: homework	1272	1356	GPT-6.1 Sol
Neither model has a result on the other 3 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index03

Math benchmarks for GPT-5.1 and GPT-6.1 Sol
Benchmark	GPT-5.1	GPT-6.1 Sol	Leader
AIME	93.3%	Not measured	Only GPT-5.1 measured
MGSM (Vals AI)	93.0%	Not measured	Only GPT-5.1 measured
AA Math Index	94.0	Not measured	Only GPT-5.1 measured
AIME 2025 (Artificial Analysis run)	94.0%	Not measured	Only GPT-5.1 measured
OTIS Mock AIME	88.6%	100.0%	GPT-6.1 Sol
FrontierMath, tiers 1 to 3	Not measured	93.7%	Only GPT-6.1 Sol measured
FrontierMath, tier 4	Not measured	100.0%	Only GPT-6.1 Sol measured
ProofBench	Not measured	99.0%	Only GPT-6.1 Sol measured
LMArena Text: math	1446	1489	GPT-6.1 Sol
LMArena Text: mathematical work	1449	1513	GPT-6.1 Sol
Neither model has a result on the other 3 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index34

Knowledge benchmarks for GPT-5.1 and GPT-6.1 Sol
Benchmark	GPT-5.1	GPT-6.1 Sol	Leader
MMLU Pro	86.4%	Not measured	Only GPT-5.1 measured
LegalBench (Vals AI)	85.7%	Not measured	Only GPT-5.1 measured
CaseLaw (Vals AI)	73.4%	Not measured	Only GPT-5.1 measured
CorpFin (Vals AI)	63.8%	Not measured	Only GPT-5.1 measured
TaxEval (Vals AI)	74.9%	Not measured	Only GPT-5.1 measured
MortgageTax (Vals AI)	61.4%	Not measured	Only GPT-5.1 measured
MedQA (Vals AI)	96.4%	Not measured	Only GPT-5.1 measured
MedCode (Vals AI)	52.7%	48.8%	GPT-5.1
MMLU Pro (Artificial Analysis run)	87.0%	Not measured	Only GPT-5.1 measured
SimpleQA Verified	48.0%	73.9%	GPT-6.1 Sol
LMArena Text: science	1459	1444	GPT-5.1
LMArena Text: medicine and healthcare	1456	1433	GPT-5.1
LMArena Text: legal and government	1459	1471	GPT-6.1 Sol
LMArena Text: business and finance	1431	1445	GPT-6.1 Sol
FACTS Benchmark Suite	45.0%	75.3%	GPT-6.1 Sol
Neither model has a result on the other 3 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index06

Web design benchmarks for GPT-5.1 and GPT-6.1 Sol
Benchmark	GPT-5.1	GPT-6.1 Sol	Leader
Design Arena: websites	1187	1321	GPT-6.1 Sol
Design Arena: UI components	1163	1317	GPT-6.1 Sol
Design Arena: game dev	1178	1389	GPT-6.1 Sol
Design Arena: data viz	1204	1281	GPT-6.1 Sol
Design Arena: 3D	1060	1460	GPT-6.1 Sol
Design Arena: all code categories	1170	1345	GPT-6.1 Sol
Design Arena: SVG	1149	Not measured	Only GPT-5.1 measured
Design Arena: ASCII art	1119	Not measured	Only GPT-5.1 measured
LiveBench design	Not measured	82.1%	Only GPT-6.1 Sol measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index517

General benchmarks for GPT-5.1 and GPT-6.1 Sol
Benchmark	GPT-5.1	GPT-6.1 Sol	Leader
Vals Index	Not measured	63.9%	Only GPT-6.1 Sol measured
LiveBench data analysis	Not measured	82.7%	Only GPT-6.1 Sol measured
Public Benefits Bench (Vals AI)	Not measured	59.3%	Only GPT-6.1 Sol measured
SAGE (Vals AI)	43.2%	46.5%	GPT-6.1 Sol
MedScribe (Vals AI)	88.1%	86.5%	GPT-5.1
IFBench	72.9%	Not measured	Only GPT-5.1 measured
Long context reasoning (AA-LCR)	80.0%	84.0%	GPT-6.1 Sol
DTBench	90.1%	96.5%	GPT-6.1 Sol
LMCA	43.9%	62.8%	GPT-6.1 Sol
CL-bench	23.7%	Not measured	Only GPT-5.1 measured
Furniture assembly	Not measured	80.0%	Only GPT-6.1 Sol measured
CL-bench Life	17.3%	Not measured	Only GPT-5.1 measured
LMArena Text	1443	1443	GPT-6.1 Sol
LMArena Text: instruction following	1443	1466	GPT-6.1 Sol
LMArena Text: creative writing	1427	1425	GPT-5.1
LMArena Vision	1250	1288	GPT-6.1 Sol
LMArena Text: English	1451	1450	GPT-5.1
LMArena Text: non-English	1431	1433	GPT-6.1 Sol
LMArena Text: Chinese	1495	1487	GPT-5.1
LMArena Text: German	1438	Not measured	Only GPT-5.1 measured
LMArena Text: Japanese	1453	Not measured	Only GPT-5.1 measured
LMArena Text: Korean	1401	Not measured	Only GPT-5.1 measured
LMArena Text: French	1450	1460	GPT-6.1 Sol
LMArena Text: Spanish	1433	1439	GPT-6.1 Sol
LMArena Text: Russian	1435	1457	GPT-6.1 Sol
LMArena Text: Polish	1440	Not measured	Only GPT-5.1 measured
LMArena Text: multi-turn	1450	1442	GPT-5.1
LMArena Text: longer queries	1448	1458	GPT-6.1 Sol
LMArena Text: writing and language	1428	1444	GPT-6.1 Sol
LMArena Text: entertainment and media	1415	1426	GPT-6.1 Sol
LMArena Vision: English	1252	1274	GPT-6.1 Sol
LMArena Vision: Chinese	1270	Not measured	Only GPT-5.1 measured
LMArena Vision: reading text	1255	1289	GPT-6.1 Sol
LMArena Vision: humor	1263	Not measured	Only GPT-5.1 measured
LMArena Vision: captioning	1252	Not measured	Only GPT-5.1 measured
LMArena Vision: recognizing things	1232	Not measured	Only GPT-5.1 measured
LMArena Vision: creative writing	1266	1301	GPT-6.1 Sol
LMArena Document	1403	Not measured	Only GPT-5.1 measured
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-5.1 and GPT-6.1 Sol
Benchmark	GPT-5.1	GPT-6.1 Sol	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-5.1$0.0063Fits in one request

GPT-6.1 Sol$0.0070Fits in one request

GPT-5.1 costs less

Repository review

50K input + 3K output tokens

GPT-5.1$0.092Fits in one request

GPT-6.1 Sol$0.130Fits in one request

GPT-5.1 costs less

Agent loop

200K input + 10K output tokens

GPT-5.1$0.350Fits in one request

GPT-6.1 Sol$0.500Fits 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 GPT-6.1 Sol
Specification	OpenAI GPT-5.1	OpenAI GPT-6.1 Sol
Maker	OpenAI	OpenAI
Weights	No public weights listed	No public weights listed
Released	November 13, 2025	September 29, 2026
Context window	400K	1.05M
Input $/Mtok	$1.25	$2.00
Output $/Mtok	$10.00	$10.00
Coding index	40.4	82.4
Independent measurements behind it	3	5
Cost per solved task	$1.02	Not computable
Source	OpenRouter listing	OpenRouter listing

Questions

Is GPT-5.1 better than GPT-6.1 Sol for coding?

Pick GPT-6.1 Sol for coding: it scores 82.4 on the Vibe Coding Index against 40.4 for GPT-5.1. Pick GPT-5.1 for work measured by MedCode (Vals AI) or LMArena Text: science, where it leads.

Which is cheaper, GPT-5.1 or GPT-6.1 Sol?

GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-6.1 Sol costs $2.00 and $10.00. Cost per solved task is known for GPT-5.1 only.

Which has the bigger context window, GPT-5.1 or GPT-6.1 Sol?

GPT-6.1 Sol, with 1.05M tokens against 400K.

How many benchmarks is the GPT-5.1 vs GPT-6.1 Sol comparison based on?

58 benchmarks have a result for both models as of October 22, 2026. GPT-5.1's coding index rests on 3 independent benchmarks and GPT-6.1 Sol's on 5. Where only one model has a result, the page says so instead of naming a winner.

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GPT-5.1 or GPT-6.1 Sol: which to pick

Which one for your work

Coding

Intelligence

Reasoning

Math

Knowledge

Web design

General

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

Compare next