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GPT-6.1 Sol vs GPT-6 Astra

GPT-6 Astra leads GPT-6.1 Sol on coding, 85.1 to 82.4 on the Vibe Coding Index, and GPT-6.1 Sol costs 5.0x less per output token ($10.00 vs $50.00 per million). Updated October 22, 2026; 97 benchmarks have a result for both.

Replace GPT-6.1 Sol Replace GPT-6 Astra
GPT-6.1 SolOpenAI
Coding
82.4
Overall
81.4
Output $/M
$10.00
32
GPT-6 AstraOpenAI
Coding
85.1
Overall
83.0
Output $/M
$50.00
60
vs boards won of 97 shared, 5 tied

GPT-6.1 Sol or GPT-6 Astra: which to pick

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 82.4 for GPT-6.1 Sol.

Pick GPT-6.1 Sol for output tokens 5.0x cheaper ($10.00 vs $50.00 per million) and work measured by LiveBench coding or SWE-bench Multimodal (Vals AI), where it leads.

Model AGPT-6.1 SolOpenAI82.4/1005 independent benchmarksNo cost per solved taskModel BGPT-6 AstraOpenAI85.1/1005 independent benchmarksNo cost per solved task
Shared results
97
GPT-6.1 Sol only
1
GPT-6 Astra only
24
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, GPT-6 Astra 85.1 from 5 benchmarks.
Widest category
Web design, 5.4 points apart on average over 7 shared benchmarks.
Widest single gap
EBR-bench: GPT-6.1 Sol 54.3% against GPT-6 Astra 76.2%, 21.9 points apart on a 0 to 100 scale.
Output price
GPT-6.1 Sol $10.00 against GPT-6 Astra $50.00 per million output tokens, 5.0x apart.
Context window
Both take 1.05M tokens.

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 SolBarsGPT-6 AstraTies
Coding414
Intelligence02
Agentic work414
Reasoning3101 tie
Math303 ties
Knowledge43
Web design16
General13111 tie
All shared boards32605 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index414
Coding benchmarks for GPT-6.1 Sol and GPT-6 Astra
BenchmarkGPT-6.1 SolGPT-6 AstraLeader
LiveBench coding96.0%93.7%GPT-6.1 Sol
LMArena WebDev17531774GPT-6 Astra
AA Coding IndexNot measured76.9Only GPT-6 Astra measured
Terminal-Bench 4 (Vals AI)55.0%59.6%GPT-6 Astra
Vibe Code Bench (Vals AI)88.9%89.6%GPT-6 Astra
Code migration (Vals AI)65.1%67.7%GPT-6 Astra
ProgramBench (Vals AI)3.0%5.5%GPT-6 Astra
IOI (Vals AI)96.9%100.0%GPT-6 Astra
Terminal-Bench 2.1 (Vals AI)Not measured87.3%Only GPT-6 Astra measured
SWE-bench Multimodal (Vals AI)43.5%43.3%GPT-6.1 Sol
Vibe Code Bench 1-100 (Vals AI)Not measured27.6%Only GPT-6 Astra measured
CyberBench (Vals AI)39.3%41.1%GPT-6 Astra
SciCode55.8%56.5%GPT-6 Astra
FrontierCode50.2%53.3%GPT-6 Astra
FrontierSWENot measured65.5%Only GPT-6 Astra measured
GSO-BenchNot measured79.4%Only GPT-6 Astra measured
WeirdMLNot measured93.3%Only GPT-6 Astra measured
MirrorCodeNot measured46.7%Only GPT-6 Astra measured
ALE-Bench2743.82951.3GPT-6 Astra
LMArena Text: coding14781489GPT-6 Astra
LMArena Text: software and IT14761474GPT-6.1 Sol
LMArena WebDev: React17541798GPT-6 Astra
LMArena WebDev: HTML18001775GPT-6.1 Sol
LMArena WebDev: from an image17021726GPT-6 Astra
SciCode9.2%12.3%GPT-6 Astra
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-6.1 Sol and GPT-6 Astra
BenchmarkGPT-6.1 SolGPT-6 AstraLeader
AA Intelligence Index51.852.7GPT-6 Astra
Epoch Capabilities Index168.4168.8GPT-6 Astra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index414
Agentic work benchmarks for GPT-6.1 Sol and GPT-6 Astra
BenchmarkGPT-6.1 SolGPT-6 AstraLeader
AA Agentic IndexNot measured51.0Only GPT-6 Astra measured
Design Arena: agents building web apps13071374GPT-6 Astra
Design Arena: agents building full-stack appsNot measured1357Only GPT-6 Astra measured
Design Arena: agents building mobile apps12231312GPT-6 Astra
Design Arena: agents building Godot gamesNot measured1348Only GPT-6 Astra measured
Design Arena: PowerPoint slidesNot measured1219Only GPT-6 Astra measured
Design Arena: spreadsheets12751379GPT-6 Astra
LiveBench research83.5%85.2%GPT-6 Astra
LiveBench browser88.0%84.0%GPT-6.1 Sol
LiveBench long agentic73.0%82.4%GPT-6 Astra
SREBench (Vals AI)50.8%56.9%GPT-6 Astra
Finance Agent (Vals AI)52.0%53.5%GPT-6 Astra
Tax Agent Bench (Vals AI)21.8%20.7%GPT-6.1 Sol
Legal Research Bench (Vals AI)38.5%39.4%GPT-6 Astra
Harvey's Legal Agent Benchmark (Vals AI)6.3%7.1%GPT-6 Astra
Excel Modeling Benchmark (Vals AI)70.8%71.7%GPT-6 Astra
BioMysteryBench (Vals AI)79.6%79.3%GPT-6.1 Sol
Terminal-Bench-Science (Vals AI)52.9%62.9%GPT-6 Astra
Vals Science Index59.6%65.1%GPT-6 Astra
Time Horizon Index (Vals AI)Not measured90.5%Only GPT-6 Astra measured
CUA-bench (Vals AI)Not measured19.2%Only GPT-6 Astra measured
Robo-bench (Vals AI)28.3%23.3%GPT-6.1 Sol
APEX-Agents60.0%64.7%GPT-6 Astra
Remote Labor IndexNot measured20.8%Only GPT-6 Astra measured
BALROGNot measured68.3%Only GPT-6 Astra measured
SpireClimb24.7%25.7%GPT-6 Astra
Vending-Bench 2Not measured$15,515Only GPT-6 Astra measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index310
Reasoning benchmarks for GPT-6.1 Sol and GPT-6 Astra
BenchmarkGPT-6.1 SolGPT-6 AstraLeader
LiveBench reasoning92.6%92.7%GPT-6 Astra
MysteryMechanism (Vals AI)46.4%53.1%GPT-6 Astra
GPQA Diamond (Artificial Analysis run)Not measured96.3%Only GPT-6 Astra measured
Humanity's Last Exam (Artificial Analysis run)52.9%54.7%GPT-6 Astra
GPQA Diamond (Epoch AI run)95.4%95.8%GPT-6 Astra
ARC-AGI98.5%98.5%Tie
ARC-AGI-294.2%95.0%GPT-6 Astra
Chess puzzles68.0%74.0%GPT-6 Astra
Mystery game puzzles80.0%84.0%GPT-6 Astra
EBR-bench54.3%76.2%GPT-6 Astra
LMArena Text: hard prompts14631463GPT-6 Astra
LMArena Text: expert14891489GPT-6 Astra
LMArena Text: hard prompts in English14651464GPT-6.1 Sol
LMArena Vision: diagrams13061297GPT-6.1 Sol
LMArena Vision: homework13561337GPT-6.1 Sol
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for GPT-6.1 Sol and GPT-6 Astra
BenchmarkGPT-6.1 SolGPT-6 AstraLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 393.7%93.7%Tie
FrontierMath, tier 4100.0%97.6%GPT-6.1 Sol
ProofBench99.0%99.0%Tie
LMArena Text: math14891465GPT-6.1 Sol
LMArena Text: mathematical work15131484GPT-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 index43
Knowledge benchmarks for GPT-6.1 Sol and GPT-6 Astra
BenchmarkGPT-6.1 SolGPT-6 AstraLeader
MedCode (Vals AI)48.8%48.5%GPT-6.1 Sol
SimpleQA Verified73.9%75.6%GPT-6 Astra
LMArena Text: science14441451GPT-6 Astra
LMArena Text: medicine and healthcare14331425GPT-6.1 Sol
LMArena Text: legal and government14711462GPT-6.1 Sol
LMArena Text: business and finance14451439GPT-6.1 Sol
FACTS Benchmark Suite75.3%75.7%GPT-6 Astra
Neither model has a result on the other 11 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index16
Web design benchmarks for GPT-6.1 Sol and GPT-6 Astra
BenchmarkGPT-6.1 SolGPT-6 AstraLeader
Design Arena: websites13211336GPT-6 Astra
Design Arena: UI components13221394GPT-6 Astra
Design Arena: game dev13921479GPT-6 Astra
Design Arena: data viz12811334GPT-6 Astra
Design Arena: 3D14601500GPT-6 Astra
Design Arena: all code categories13461378GPT-6 Astra
Design Arena: SVGNot measured1430Only GPT-6 Astra measured
Design Arena: ASCII artNot measured1353Only GPT-6 Astra measured
LiveBench design82.1%82.0%GPT-6.1 Sol
GeneralLike-for-likePublic boards, shown as published, kept out of the index1311
General benchmarks for GPT-6.1 Sol and GPT-6 Astra
BenchmarkGPT-6.1 SolGPT-6 AstraLeader
Vals Index63.9%65.0%GPT-6 Astra
LiveBench data analysis82.7%83.0%GPT-6 Astra
Public Benefits Bench (Vals AI)59.3%Not measuredOnly GPT-6.1 Sol measured
SAGE (Vals AI)46.5%46.4%GPT-6.1 Sol
MedScribe (Vals AI)86.5%87.9%GPT-6 Astra
Long context reasoning (AA-LCR)84.0%80.7%GPT-6.1 Sol
DTBench96.5%97.3%GPT-6 Astra
LMCA62.8%64.4%GPT-6 Astra
Furniture assembly80.0%80.0%Tie
LMArena Text14431441GPT-6.1 Sol
LMArena Text: instruction following14661455GPT-6.1 Sol
LMArena Text: creative writing14251420GPT-6.1 Sol
LMArena Vision12881280GPT-6.1 Sol
LMArena Text: English14501447GPT-6.1 Sol
LMArena Text: non-English14331432GPT-6.1 Sol
LMArena Text: Chinese14871489GPT-6 Astra
LMArena Text: GermanNot measured1459Only GPT-6 Astra measured
LMArena Text: JapaneseNot measured1405Only GPT-6 Astra measured
LMArena Text: KoreanNot measured1428Only GPT-6 Astra measured
LMArena Text: French14601432GPT-6.1 Sol
LMArena Text: Spanish14391422GPT-6.1 Sol
LMArena Text: Russian14571438GPT-6.1 Sol
LMArena Text: PolishNot measured1422Only GPT-6 Astra measured
LMArena Text: multi-turn14421447GPT-6 Astra
LMArena Text: longer queries14581460GPT-6 Astra
LMArena Text: writing and language14441437GPT-6.1 Sol
LMArena Text: entertainment and media14261427GPT-6 Astra
LMArena Vision: English12741280GPT-6 Astra
LMArena Vision: ChineseNot measured1361Only GPT-6 Astra measured
LMArena Vision: reading text12891292GPT-6 Astra
LMArena Vision: creative writing13011286GPT-6.1 Sol
Neither model has a result on the other 15 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 GPT-6 Astra
BenchmarkGPT-6.1 SolGPT-6 AstraLeader
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
GPT-6 Astra$0.035Fits in one request

GPT-6.1 Sol costs less

Repository review

50K input + 3K output tokens

GPT-6.1 Sol$0.130Fits in one request
GPT-6 Astra$0.650Fits in one request

GPT-6.1 Sol costs less

Agent loop

200K input + 10K output tokens

GPT-6.1 Sol$0.500Fits in one request
GPT-6 Astra$2.50Fits in one request

GPT-6.1 Sol 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 GPT-6 Astra
SpecificationOpenAI GPT-6.1 SolOpenAI GPT-6 Astra
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 29, 2026September 4, 2026
Context window1.05M1.05M
Input $/Mtok$2.00$10.00
Output $/Mtok$10.00$50.00
Coding index82.485.1
Independent measurements behind it55
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6.1 Sol better than GPT-6 Astra for coding?

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 82.4 for GPT-6.1 Sol. Pick GPT-6.1 Sol for output tokens 5.0x cheaper ($10.00 vs $50.00 per million) and work measured by LiveBench coding or SWE-bench Multimodal (Vals AI), where it leads.

Which is cheaper, GPT-6.1 Sol or GPT-6 Astra?

GPT-6.1 Sol costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. Cost per solved task is known for neither of them.

Which has the bigger context window, GPT-6.1 Sol or GPT-6 Astra?

Neither: both take 1.05M tokens.

How many benchmarks is the GPT-6.1 Sol vs GPT-6 Astra comparison based on?

97 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 GPT-6 Astra's on 5. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-6-1-sol-vs-gpt-6-astra">LLMBenchmark.ai, GPT-6.1 Sol vs GPT-6 Astra</a></p>