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GPT-6.1 Sol vs Step 5 Preview

GPT-6.1 Sol leads Step 5 Preview on coding, 82.4 to 61.1 on the Vibe Coding Index, and Step 5 Preview costs 3.7x less per output token ($2.70 vs $10.00 per million). Updated October 22, 2026; 60 benchmarks have a result for both.

Replace GPT-6.1 Sol Replace Step 5 Preview
GPT-6.1 SolOpenAI
Coding
82.4
Overall
81.4
Output $/M
$10.00
49
Step 5 PreviewStepFun
Coding
61.1
Overall
60.5
Output $/M
$2.70
11
vs boards won of 60 shared

GPT-6.1 Sol or Step 5 Preview: which to pick

Pick GPT-6.1 Sol for coding: it scores 82.4 on the Vibe Coding Index against 61.1 for Step 5 Preview.

Pick Step 5 Preview for output tokens 3.7x cheaper ($2.70 vs $10.00 per million) and work measured by SciCode or LMArena Text: coding, where it leads.

Model AGPT-6.1 SolOpenAI82.4/1005 independent benchmarksNo cost per solved taskModel BStep 5 PreviewStepFun61.1/1004 independent benchmarksNo cost per solved task
Shared results
60
GPT-6.1 Sol only
38
Step 5 Preview only
1
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-6.1 Sol 82.4 from 5 benchmarks, Step 5 Preview 61.1 from 4 benchmarks.
Widest category
Agentic work, 25.9 points apart on average over 11 shared benchmarks.
Widest single gap
LiveBench browser: GPT-6.1 Sol 88.0% against Step 5 Preview 24.0%, 64.0 points apart on a 0 to 100 scale.
Output price
GPT-6.1 Sol $10.00 against Step 5 Preview $2.70 per million output tokens, 3.7x apart.
Context window
GPT-6.1 Sol takes 1.05M tokens, Step 5 Preview 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-6.1 SolBarsStep 5 PreviewTies
Coding112
Intelligence10
Agentic work92
Reasoning71
Math30
Knowledge22
Web design10
General154
All shared boards4911
CodingLike-for-likeSix of these boards feed the Vibe Coding Index112
Coding benchmarks for GPT-6.1 Sol and Step 5 Preview
BenchmarkGPT-6.1 SolStep 5 PreviewLeader
LiveBench coding96.0%85.6%GPT-6.1 Sol
LMArena WebDev17531567GPT-6.1 Sol
Terminal-Bench 4 (Vals AI)55.0%31.8%GPT-6.1 Sol
Vibe Code Bench (Vals AI)88.9%70.4%GPT-6.1 Sol
Code migration (Vals AI)65.1%39.0%GPT-6.1 Sol
ProgramBench (Vals AI)3.0%Not measuredOnly GPT-6.1 Sol measured
IOI (Vals AI)96.9%38.1%GPT-6.1 Sol
SWE-bench Multimodal (Vals AI)43.5%40.8%GPT-6.1 Sol
CyberBench (Vals AI)39.3%Not measuredOnly GPT-6.1 Sol measured
SciCode55.8%58.9%Step 5 Preview
FrontierCode50.2%Not measuredOnly GPT-6.1 Sol measured
ALE-Bench2743.8Not measuredOnly GPT-6.1 Sol measured
LMArena Text: coding14781485Step 5 Preview
LMArena Text: software and IT14761473GPT-6.1 Sol
LMArena WebDev: React17541583GPT-6.1 Sol
LMArena WebDev: HTML18001556GPT-6.1 Sol
LMArena WebDev: from an image17021550GPT-6.1 Sol
SciCode9.2%Not measuredOnly GPT-6.1 Sol measured
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for GPT-6.1 Sol and Step 5 Preview
BenchmarkGPT-6.1 SolStep 5 PreviewLeader
AA Intelligence Index51.843.7GPT-6.1 Sol
Epoch Capabilities Index168.4Not measuredOnly GPT-6.1 Sol measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index92
Agentic work benchmarks for GPT-6.1 Sol and Step 5 Preview
BenchmarkGPT-6.1 SolStep 5 PreviewLeader
Design Arena: agents building web apps1306Not measuredOnly GPT-6.1 Sol measured
Design Arena: agents building mobile apps1213Not measuredOnly GPT-6.1 Sol measured
Design Arena: spreadsheets1259Not measuredOnly GPT-6.1 Sol measured
LiveBench research83.5%72.8%GPT-6.1 Sol
LiveBench browser88.0%24.0%GPT-6.1 Sol
LiveBench long agentic73.0%27.5%GPT-6.1 Sol
SREBench (Vals AI)50.8%0.4%GPT-6.1 Sol
Finance Agent (Vals AI)52.0%50.7%GPT-6.1 Sol
Tax Agent Bench (Vals AI)21.8%27.3%Step 5 Preview
Legal Research Bench (Vals AI)38.5%40.4%Step 5 Preview
Harvey's Legal Agent Benchmark (Vals AI)6.3%Not measuredOnly GPT-6.1 Sol measured
Excel Modeling Benchmark (Vals AI)70.8%57.1%GPT-6.1 Sol
BioMysteryBench (Vals AI)79.6%67.4%GPT-6.1 Sol
Terminal-Bench-Science (Vals AI)52.9%2.9%GPT-6.1 Sol
Vals Science Index59.6%29.6%GPT-6.1 Sol
Robo-bench (Vals AI)28.3%Not measuredOnly GPT-6.1 Sol measured
APEX-Agents60.0%Not measuredOnly GPT-6.1 Sol measured
SpireClimb24.7%Not measuredOnly GPT-6.1 Sol measured
Neither model has a result on the other 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index71
Reasoning benchmarks for GPT-6.1 Sol and Step 5 Preview
BenchmarkGPT-6.1 SolStep 5 PreviewLeader
LiveBench reasoning92.6%83.8%GPT-6.1 Sol
MysteryMechanism (Vals AI)46.4%18.5%GPT-6.1 Sol
Humanity's Last Exam (Artificial Analysis run)52.9%46.5%GPT-6.1 Sol
GPQA Diamond (Epoch AI run)95.4%Not measuredOnly GPT-6.1 Sol measured
ARC-AGI98.5%Not measuredOnly GPT-6.1 Sol measured
ARC-AGI-294.2%Not measuredOnly GPT-6.1 Sol measured
Chess puzzles68.0%Not measuredOnly GPT-6.1 Sol measured
Mystery game puzzles80.0%Not measuredOnly GPT-6.1 Sol measured
EBR-bench54.3%Not measuredOnly GPT-6.1 Sol measured
LMArena Text: hard prompts14631461GPT-6.1 Sol
LMArena Text: expert14891485GPT-6.1 Sol
LMArena Text: hard prompts in English14651454GPT-6.1 Sol
LMArena Vision: diagrams13061308Step 5 Preview
LMArena Vision: homework13561265GPT-6.1 Sol
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for GPT-6.1 Sol and Step 5 Preview
BenchmarkGPT-6.1 SolStep 5 PreviewLeader
OTIS Mock AIME100.0%Not measuredOnly GPT-6.1 Sol measured
FrontierMath, tiers 1 to 393.7%Not measuredOnly GPT-6.1 Sol measured
FrontierMath, tier 4100.0%Not measuredOnly GPT-6.1 Sol measured
ProofBench99.0%42.0%GPT-6.1 Sol
LMArena Text: math14891458GPT-6.1 Sol
LMArena Text: mathematical work15131460GPT-6.1 Sol
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index22
Knowledge benchmarks for GPT-6.1 Sol and Step 5 Preview
BenchmarkGPT-6.1 SolStep 5 PreviewLeader
MedCode (Vals AI)48.8%Not measuredOnly GPT-6.1 Sol measured
SimpleQA Verified73.9%Not measuredOnly GPT-6.1 Sol measured
LMArena Text: science14441454Step 5 Preview
LMArena Text: medicine and healthcare14331439Step 5 Preview
LMArena Text: legal and government14711437GPT-6.1 Sol
LMArena Text: business and finance14451435GPT-6.1 Sol
FACTS Benchmark Suite75.3%Not measuredOnly GPT-6.1 Sol measured
Neither model has a result on the other 11 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index10
Web design benchmarks for GPT-6.1 Sol and Step 5 Preview
BenchmarkGPT-6.1 SolStep 5 PreviewLeader
Design Arena: websites1321Not measuredOnly GPT-6.1 Sol measured
Design Arena: UI components1317Not measuredOnly GPT-6.1 Sol measured
Design Arena: game dev1389Not measuredOnly GPT-6.1 Sol measured
Design Arena: data viz1281Not measuredOnly GPT-6.1 Sol measured
Design Arena: 3D1460Not measuredOnly GPT-6.1 Sol measured
Design Arena: all code categories1345Not measuredOnly GPT-6.1 Sol measured
LiveBench design82.1%76.9%GPT-6.1 Sol
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index154
General benchmarks for GPT-6.1 Sol and Step 5 Preview
BenchmarkGPT-6.1 SolStep 5 PreviewLeader
Vals Index63.9%Not measuredOnly GPT-6.1 Sol measured
LiveBench data analysis82.7%63.5%GPT-6.1 Sol
Public Benefits Bench (Vals AI)59.3%58.1%GPT-6.1 Sol
SAGE (Vals AI)46.5%Not measuredOnly GPT-6.1 Sol measured
MedScribe (Vals AI)86.5%Not measuredOnly GPT-6.1 Sol measured
Long context reasoning (AA-LCR)84.0%88.3%Step 5 Preview
DTBench96.5%Not measuredOnly GPT-6.1 Sol measured
LMCA62.8%Not measuredOnly GPT-6.1 Sol measured
Furniture assembly80.0%Not measuredOnly GPT-6.1 Sol measured
LMArena Text14431440GPT-6.1 Sol
LMArena Text: instruction following14661438GPT-6.1 Sol
LMArena Text: creative writing14251409GPT-6.1 Sol
LMArena Vision12881265GPT-6.1 Sol
LMArena Text: English14501447GPT-6.1 Sol
LMArena Text: non-English14331428GPT-6.1 Sol
LMArena Text: Chinese14871500Step 5 Preview
LMArena Text: JapaneseNot measured1383Only Step 5 Preview measured
LMArena Text: French14601438GPT-6.1 Sol
LMArena Text: Spanish14391441Step 5 Preview
LMArena Text: Russian14571433GPT-6.1 Sol
LMArena Text: multi-turn14421437GPT-6.1 Sol
LMArena Text: longer queries14581449GPT-6.1 Sol
LMArena Text: writing and language14441425GPT-6.1 Sol
LMArena Text: entertainment and media14261412GPT-6.1 Sol
LMArena Vision: English12741290Step 5 Preview
LMArena Vision: reading text12891282GPT-6.1 Sol
LMArena Vision: creative writing1301Not measuredOnly GPT-6.1 Sol measured
Neither model has a result on the other 19 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-6.1 Sol and Step 5 Preview
BenchmarkGPT-6.1 SolStep 5 PreviewLeader
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-6.1 Sol$0.0070Fits in one request
Step 5 Preview$0.0024Fits in one request

Step 5 Preview costs less

Repository review

50K input + 3K output tokens

GPT-6.1 Sol$0.130Fits in one request
Step 5 Preview$0.058Fits in one request

Step 5 Preview costs less

Agent loop

200K input + 10K output tokens

GPT-6.1 Sol$0.500Fits in one request
Step 5 Preview$0.227Fits in one request

Step 5 Preview 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-6.1 Sol and Step 5 Preview
SpecificationOpenAI GPT-6.1 SolStepFun Step 5 Preview
MakerOpenAIStepFun
WeightsNo public weights listedOpen weights
ReleasedSeptember 29, 2026October 8, 2026
Context window1.05M1.05M
Input $/Mtok$2.00$1.00
Output $/Mtok$10.00$2.70
Coding index82.461.1
Independent measurements behind it54
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6.1 Sol better than Step 5 Preview for coding?

Pick GPT-6.1 Sol for coding: it scores 82.4 on the Vibe Coding Index against 61.1 for Step 5 Preview. Pick Step 5 Preview for output tokens 3.7x cheaper ($2.70 vs $10.00 per million) and work measured by SciCode or LMArena Text: coding, where it leads.

Which is cheaper, GPT-6.1 Sol or Step 5 Preview?

GPT-6.1 Sol costs $2.00 per million input tokens and $10.00 per million output tokens; Step 5 Preview costs $1.00 and $2.70. Cost per solved task is known for neither of them.

Which has the bigger context window, GPT-6.1 Sol or Step 5 Preview?

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

How many benchmarks is the GPT-6.1 Sol vs Step 5 Preview comparison based on?

60 benchmarks have a result for both models as of October 22, 2026. GPT-6.1 Sol's coding index rests on 5 independent benchmarks and Step 5 Preview's on 4. Where only one model has a result, the page says so instead of naming a winner.

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<iframe src="https://llmbenchmark.ai/embed/compare/gpt-6-1-sol-vs-stepfun-step-5-preview" title="GPT-6.1 Sol vs Step 5 Preview, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-6-1-sol-vs-stepfun-step-5-preview">LLMBenchmark.ai, GPT-6.1 Sol vs Step 5 Preview</a></p>