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GPT-5.1 vs GPT-5.6 Sol

GPT-5.6 Sol leads GPT-5.1 on coding, 73.5 to 40.4 on the Vibe Coding Index, and GPT-5.1 costs 2.0x less per output token ($10.00 vs $20.00 per million). Updated October 22, 2026; 85 benchmarks have a result for both.

Replace GPT-5.1 Replace GPT-5.6 Sol
GPT-5.1OpenAI
Coding
40.4
Overall
55.0
Output $/M
$10.00
8
GPT-5.6 SolOpenAI
Coding
73.5
Overall
74.7
Output $/M
$20.00
77
vs boards won of 85 shared

GPT-5.1 or GPT-5.6 Sol: which to pick

Pick GPT-5.6 Sol for coding: it scores 73.5 on the Vibe Coding Index against 40.4 for GPT-5.1.

Pick GPT-5.1 for output tokens 2.0x cheaper ($10.00 vs $20.00 per million) and a lower cost per solved task ($1.02 against $1.20).

Model AGPT-5.1OpenAI40.4/1003 independent benchmarks$1.02 per solved taskModel BGPT-5.6 SolOpenAI73.5/1006 independent benchmarks$1.20 per solved task
Shared results
85
GPT-5.1 only
16
GPT-5.6 Sol only
54
Like-for-like categories
8 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.

At a glance

Coding index
GPT-5.1 40.4 from 3 benchmarks, GPT-5.6 Sol 73.5 from 6 benchmarks.
Widest category
Coding, 29.3 points apart on average over 13 shared benchmarks.
Widest single gap
ARC-AGI-2: GPT-5.1 17.6% against GPT-5.6 Sol 92.5%, 74.9 points apart on a 0 to 100 scale.
Output price
GPT-5.1 $10.00 against GPT-5.6 Sol $20.00 per million output tokens, 2.0x apart.
Context window
GPT-5.1 takes 400K tokens, GPT-5.6 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
CategoryGPT-5.1BarsGPT-5.6 SolTies
Coding112
Intelligence02
Agentic work02
Reasoning015
Math03
Knowledge48
Web design08
General327
All shared boards877
CodingLike-for-likeSix of these boards feed the Vibe Coding Index112
Coding benchmarks for GPT-5.1 and GPT-5.6 Sol
BenchmarkGPT-5.1GPT-5.6 SolLeader
SWE-bench Verified66.0%Not measuredOnly GPT-5.1 measured
LiveBench codingNot measured89.7%Only GPT-5.6 Sol measured
LMArena WebDev13961616GPT-5.6 Sol
AA Coding Index49.477.4GPT-5.6 Sol
LiveCodeBench (Vals AI)86.5%82.6%GPT-5.1
SWE-bench Verified (Vals AI)69.8%96.2%GPT-5.6 Sol
Terminal-Bench 4 (Vals AI)Not measured37.9%Only GPT-5.6 Sol measured
Vibe Code Bench (Vals AI)24.6%80.5%GPT-5.6 Sol
Code migration (Vals AI)Not measured52.9%Only GPT-5.6 Sol measured
ProgramBench (Vals AI)Not measured1.5%Only GPT-5.6 Sol measured
IOI (Vals AI)Not measured91.2%Only GPT-5.6 Sol measured
Terminal-Bench 2.1 (Vals AI)Not measured85.8%Only GPT-5.6 Sol measured
Vibe Code Bench 1-100 (Vals AI)Not measured20.0%Only GPT-5.6 Sol measured
SkillsBench (Vals AI)Not measured54.1%Only GPT-5.6 Sol measured
CyberBench (Vals AI)Not measured76.3%Only GPT-5.6 Sol measured
LiveCodeBench (Artificial Analysis run)86.8%Not measuredOnly GPT-5.1 measured
SciCodeNot measured57.8%Only GPT-5.6 Sol measured
Terminal-Bench Hard (Artificial Analysis run)45.5%65.9%GPT-5.6 Sol
Terminal-Bench47.6%Not measuredOnly GPT-5.1 measured
FrontierCodeNot measured47.5%Only GPT-5.6 Sol measured
FrontierSWENot measured32.2%Only GPT-5.6 Sol measured
GSO-Bench13.7%76.5%GPT-5.6 Sol
WeirdML60.8%88.8%GPT-5.6 Sol
MirrorCodeNot measured20.0%Only GPT-5.6 Sol measured
ALE-BenchNot measured2176.9Only GPT-5.6 Sol measured
LMArena Text: coding14531496GPT-5.6 Sol
LMArena Text: software and IT14541489GPT-5.6 Sol
LMArena WebDev: React13071620GPT-5.6 Sol
LMArena WebDev: HTML14051618GPT-5.6 Sol
LMArena WebDev: from an image14211609GPT-5.6 Sol
SciCodeNot measured10.8%Only GPT-5.6 Sol measured
Neither model has a result on the other 8 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5.1 and GPT-5.6 Sol
BenchmarkGPT-5.1GPT-5.6 SolLeader
AA Intelligence Index24.747.0GPT-5.6 Sol
Epoch Capabilities Index149.8162.8GPT-5.6 Sol
Agentic workLike-for-likePublic boards, shown as published, kept out of the index02
Agentic work benchmarks for GPT-5.1 and GPT-5.6 Sol
BenchmarkGPT-5.1GPT-5.6 SolLeader
AA Agentic IndexNot measured50.2Only GPT-5.6 Sol measured
Design Arena: agents building web appsNot measured1245Only GPT-5.6 Sol measured
Design Arena: agents building full-stack appsNot measured1261Only GPT-5.6 Sol measured
Design Arena: agents building mobile appsNot measured1248Only GPT-5.6 Sol measured
Design Arena: agents building Android appsNot measured1240Only GPT-5.6 Sol measured
Design Arena: agents building Godot gamesNot measured1260Only GPT-5.6 Sol measured
Design Arena: agents building gamesNot measured1266Only GPT-5.6 Sol measured
Design Arena: HTML slidesNot measured1236Only GPT-5.6 Sol measured
Design Arena: PowerPoint slidesNot measured1215Only GPT-5.6 Sol measured
LiveBench researchNot measured54.5%Only GPT-5.6 Sol measured
LiveBench browserNot measured88.0%Only GPT-5.6 Sol measured
LiveBench long agenticNot measured48.5%Only GPT-5.6 Sol measured
SREBench (Vals AI)Not measured30.5%Only GPT-5.6 Sol measured
Finance Agent (Vals AI)Not measured53.8%Only GPT-5.6 Sol measured
Tax Agent Bench (Vals AI)Not measured31.1%Only GPT-5.6 Sol measured
Legal Research Bench (Vals AI)Not measured48.1%Only GPT-5.6 Sol measured
Excel Modeling Benchmark (Vals AI)Not measured72.3%Only GPT-5.6 Sol measured
BioMysteryBench (Vals AI)Not measured71.1%Only GPT-5.6 Sol measured
Terminal-Bench-Science (Vals AI)Not measured20.0%Only GPT-5.6 Sol measured
Vals Science IndexNot measured41.5%Only GPT-5.6 Sol measured
Time Horizon Index (Vals AI)Not measured23.8%Only GPT-5.6 Sol measured
CUA-bench (Vals AI)Not measured8.3%Only GPT-5.6 Sol measured
τ²-Bench Telecom81.9%85.1%GPT-5.6 Sol
OSWorld 2.0Not measured27.3%Only GPT-5.6 Sol measured
BALROGNot measured60.0%Only GPT-5.6 Sol measured
DeepResearch Bench42.8%Not measuredOnly GPT-5.1 measured
PostTrainBenchNot measured36.2%Only GPT-5.6 Sol measured
Vending-Bench 2$1,473$9,619GPT-5.6 Sol
LMArena SearchNot measured1261Only GPT-5.6 Sol measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index015
Reasoning benchmarks for GPT-5.1 and GPT-5.6 Sol
BenchmarkGPT-5.1GPT-5.6 SolLeader
GPQA Diamond86.6%95.2%GPT-5.6 Sol
LiveBench reasoningNot measured91.7%Only GPT-5.6 Sol measured
MysteryMechanism (Vals AI)Not measured33.3%Only GPT-5.6 Sol measured
MMMU Pro (Vals AI)83.2%88.8%GPT-5.6 Sol
GPQA Diamond (Artificial Analysis run)87.3%94.1%GPT-5.6 Sol
Humanity's Last Exam (Artificial Analysis run)28.5%49.5%GPT-5.6 Sol
GPQA Diamond (Epoch AI run)87.6%93.5%GPT-5.6 Sol
ARC-AGI72.8%97.5%GPT-5.6 Sol
ARC-AGI-217.6%92.5%GPT-5.6 Sol
SimpleBench53.2%64.8%GPT-5.6 Sol
Chess puzzles42.0%59.0%GPT-5.6 Sol
Mystery game puzzles19.0%58.0%GPT-5.6 Sol
EBR-benchNot measured44.8%Only GPT-5.6 Sol measured
VPCT58.7%Not measuredOnly GPT-5.1 measured
LMArena Text: hard prompts14571483GPT-5.6 Sol
LMArena Text: expert14701517GPT-5.6 Sol
LMArena Text: hard prompts in English14621477GPT-5.6 Sol
LMArena Vision: diagrams12641305GPT-5.6 Sol
LMArena Vision: homework12721305GPT-5.6 Sol
Kagi LLM BenchmarkNot measured67.0%Only GPT-5.6 Sol measured
Neither model has a result on the other 2 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for GPT-5.1 and GPT-5.6 Sol
BenchmarkGPT-5.1GPT-5.6 SolLeader
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%100.0%GPT-5.6 Sol
FrontierMath, tiers 1 to 3Not measured89.1%Only GPT-5.6 Sol measured
FrontierMath, tier 4Not measured82.9%Only GPT-5.6 Sol measured
ProofBenchNot measured83.0%Only GPT-5.6 Sol measured
LMArena Text: math14461473GPT-5.6 Sol
LMArena Text: mathematical work14491496GPT-5.6 Sol
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index48
Knowledge benchmarks for GPT-5.1 and GPT-5.6 Sol
BenchmarkGPT-5.1GPT-5.6 SolLeader
MMLU Pro86.4%89.1%GPT-5.6 Sol
LegalBench (Vals AI)85.7%87.0%GPT-5.6 Sol
CaseLaw (Vals AI)73.4%Not measuredOnly GPT-5.1 measured
CorpFin (Vals AI)63.8%64.4%GPT-5.6 Sol
TaxEval (Vals AI)74.9%74.8%GPT-5.1
MortgageTax (Vals AI)61.4%67.3%GPT-5.6 Sol
MedQA (Vals AI)96.4%Not measuredOnly GPT-5.1 measured
MedCode (Vals AI)52.7%44.0%GPT-5.1
MMLU Pro (Artificial Analysis run)87.0%Not measuredOnly GPT-5.1 measured
SimpleQA Verified48.0%69.7%GPT-5.6 Sol
LMArena Text: science14591455GPT-5.1
LMArena Text: medicine and healthcare14561431GPT-5.1
LMArena Text: legal and government14591476GPT-5.6 Sol
LMArena Text: business and finance14311457GPT-5.6 Sol
FACTS Benchmark Suite45.0%52.4%GPT-5.6 Sol
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 GPT-5.6 Sol
BenchmarkGPT-5.1GPT-5.6 SolLeader
Design Arena: websites11871321GPT-5.6 Sol
Design Arena: UI components11631335GPT-5.6 Sol
Design Arena: game dev11781367GPT-5.6 Sol
Design Arena: data viz12041322GPT-5.6 Sol
Design Arena: 3D10601384GPT-5.6 Sol
Design Arena: all code categories11701341GPT-5.6 Sol
Design Arena: SVG11491314GPT-5.6 Sol
Design Arena: ASCII art11191304GPT-5.6 Sol
LiveBench designNot measured81.6%Only GPT-5.6 Sol measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index327
General benchmarks for GPT-5.1 and GPT-5.6 Sol
BenchmarkGPT-5.1GPT-5.6 SolLeader
LiveBench data analysisNot measured79.8%Only GPT-5.6 Sol measured
Public Benefits Bench (Vals AI)Not measured66.5%Only GPT-5.6 Sol measured
SAGE (Vals AI)43.2%52.6%GPT-5.6 Sol
MedScribe (Vals AI)88.1%85.2%GPT-5.1
Vals Multimodal IndexNot measured72.6%Only GPT-5.6 Sol measured
IFBench72.9%72.7%GPT-5.1
Long context reasoning (AA-LCR)80.0%84.0%GPT-5.6 Sol
DTBench90.1%95.7%GPT-5.6 Sol
LMCA43.9%58.5%GPT-5.6 Sol
CL-bench23.7%Not measuredOnly GPT-5.1 measured
Surface Evolver BenchNot measured93.1%Only GPT-5.6 Sol measured
Furniture assemblyNot measured56.7%Only GPT-5.6 Sol measured
CL-bench Life17.3%Not measuredOnly GPT-5.1 measured
LMArena Text14431457GPT-5.6 Sol
LMArena Text: instruction following14431483GPT-5.6 Sol
LMArena Text: creative writing14271449GPT-5.6 Sol
LMArena Vision12501281GPT-5.6 Sol
LMArena Text: English14511457GPT-5.6 Sol
LMArena Text: non-English14311451GPT-5.6 Sol
LMArena Text: Chinese14951525GPT-5.6 Sol
LMArena Text: German14381476GPT-5.6 Sol
LMArena Text: Japanese14531472GPT-5.6 Sol
LMArena Text: Korean14011442GPT-5.6 Sol
LMArena Text: French14501472GPT-5.6 Sol
LMArena Text: Spanish14331443GPT-5.6 Sol
LMArena Text: Russian14351471GPT-5.6 Sol
LMArena Text: Polish14401459GPT-5.6 Sol
LMArena Text: multi-turn14501461GPT-5.6 Sol
LMArena Text: longer queries14481481GPT-5.6 Sol
LMArena Text: writing and language14281462GPT-5.6 Sol
LMArena Text: entertainment and media14151450GPT-5.6 Sol
LMArena Vision: English12521280GPT-5.6 Sol
LMArena Vision: Chinese12701313GPT-5.6 Sol
LMArena Vision: reading text12551290GPT-5.6 Sol
LMArena Vision: humor12631246GPT-5.1
LMArena Vision: captioning1252Not measuredOnly GPT-5.1 measured
LMArena Vision: recognizing things1232Not measuredOnly GPT-5.1 measured
LMArena Vision: creative writing12661283GPT-5.6 Sol
LMArena Document14031483GPT-5.6 Sol
Neither model has a result on the other 7 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-5.6 Sol
BenchmarkGPT-5.1GPT-5.6 SolLeader
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-5.6 Sol$0.014Fits in one request

GPT-5.1 costs less

Repository review

50K input + 3K output tokens

GPT-5.1$0.092Fits in one request
GPT-5.6 Sol$0.260Fits in one request

GPT-5.1 costs less

Agent loop

200K input + 10K output tokens

GPT-5.1$0.350Fits in one request
GPT-5.6 Sol$1.00Fits 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-5.6 Sol
SpecificationOpenAI GPT-5.1OpenAI GPT-5.6 Sol
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 13, 2025July 9, 2026
Context window400K1.05M
Input $/Mtok$1.25$4.00
Output $/Mtok$10.00$20.00
Coding index40.473.5
Independent measurements behind it36
Cost per solved task$1.02$1.20
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1 better than GPT-5.6 Sol for coding?

Pick GPT-5.6 Sol for coding: it scores 73.5 on the Vibe Coding Index against 40.4 for GPT-5.1. Pick GPT-5.1 for output tokens 2.0x cheaper ($10.00 vs $20.00 per million) and a lower cost per solved task ($1.02 against $1.20).

Which is cheaper, GPT-5.1 or GPT-5.6 Sol?

GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. Per solved SWE-bench Verified task, GPT-5.1 costs $1.02 and GPT-5.6 Sol $1.20.

Which has the bigger context window, GPT-5.1 or GPT-5.6 Sol?

GPT-5.6 Sol, with 1.05M tokens against 400K.

How many benchmarks is the GPT-5.1 vs GPT-5.6 Sol comparison based on?

85 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-5.6 Sol's on 6. Where only one model has a result, the page says so instead of naming a winner.

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