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GPT-6 Sol vs Kimi K3.1 Pro

Full profiles: GPT-6 Sol (OpenAI) and Kimi K3.1 Pro (Moonshot AI): every benchmark, price and rank.

Updated · Data from 9 sources

As of 25 Oct 2026, GPT-6 Sol (max) and Kimi K3.1 Pro are neck and neck on quality (66.4 vs 66.9, inside the ±7.3 margin of error) and cost about the same, so speed decides it: GPT-6 Sol (max) streams 1.4× faster. Kimi K3.1 Pro leads in every category we measure both in.

GPT-6 Sol benchmarks max OpenAI Kimi K3.1 Pro benchmarks Moonshot AIOpen in the comparison tool

Which to pick for…

The pick's numbers come first. Category scores on the BenchLeader scale (50 is the average model, 15 points one standard deviation). High confidence means a lead of half a standard deviation or more; under one point is called either.

Use casePickWhyConfidence
Agents & tool useKimi K3.1 Pro68 vs 60 category score; CyberGym end-to-end (AA) 94.7% vs 0.0%High
ReasoningKimi K3.1 Pro81 vs 72 category score; CritPt 24.6% vs 30.9%High
KnowledgeKimi K3.1 Pro75 vs 70 category score; AA-Omniscience 29.5 vs 27.1Medium
Long documentsKimi K3.1 Pro68 vs 67 category score; AA-LCR 86.3% vs 83.7%Medium
Images and other mediaKimi K3.1 Pro67 vs 61 category score; MMMU-Pro 83.9% vs 83.0%Medium
Chat quality (human preference)–Only GPT-6 Sol has an Arena rating (65 category score)Not comparable
Lowest costEither$4.00 vs $4.00 per 1M blended; agentic coding session $0.160 vs $0.160–
Fastest first answerKimi K3.1 Pro30.2 s (Kimi K3.1 Pro) vs 73.9 s (GPT-6 Sol (max)) to the first answer token–
High volume on a budgetNeither flagshipA smaller model is usually the better fit: Cheapest good LLMs, Fastest LLMs–

Key differences

  • GPT-6 Sol (max) and Kimi K3.1 Pro are neck and neck on quality (66.4 vs 66.9, within the ±7.3 margin).
  • GPT-6 Sol (max) is stronger in coding, composite, human preference, maths.
  • Kimi K3.1 Pro is stronger in agents & tools, knowledge, long context, multimodal, reasoning.
  • They cost about the same ($4.00 per 1M blended).
  • GPT-6 Sol (max) streams 1.4× faster (103 vs 73 tokens per second).

At a glance

SpecGPT-6 SolKimi K3.1 Pro
DeveloperOpenAIMoonshot AI
Released22 Sept 202623 Oct 2026
Context window (tokens)1,050,0001,048,576
Compared atGPT-6 Sol (max)Kimi K3.1 Pro
Open weightsNoNo
Price in / out / cached input per 1M$2.00 / $10.00 / $0.200$2.00 / $10.00 / $0.200

Category by category

Category scores on the BenchLeader scale: 50 is the average evaluated model, 15 points is one standard deviation. A gap under one point is called level.

CategoryGPT-6 Sol (max)Kimi K3.1 ProLeader
Reasoning71.581.3Kimi K3.1 Pro
Coding67.2–not comparable
Agents & tools59.868.0Kimi K3.1 Pro
Maths69.2–not comparable
Knowledge69.774.8Kimi K3.1 Pro
Human preference64.6–not comparable
Multimodal61.467.0Kimi K3.1 Pro
Long context67.068.3Kimi K3.1 Pro
Composite82.875.8GPT-6 Sol

Where sources disagree

Across the 18 benchmarks both have, GPT-6 Sol leads 5, Kimi K3.1 Pro leads 13. Every overall index that rates both puts Kimi K3.1 Pro ahead.

Overall indexGPT-6 Sol (max)Kimi K3.1 ProLeader
BenchLeader Index66.466.9neck and neck
AA Intelligence Index v4.3.247.655.1Kimi K3.1 Pro

Each publisher runs its own tasks, harnesses and effort settings, so their overall verdicts can differ; BenchLeader reconciles them on one scale. † measured at another effort setting of the same model (the publisher did not test the one compared here).

Price, speed and latency

List prices blended at three input tokens per output token. Per-task prices use the token counts on the methodology page; suite cost is what Artificial Analysis paid to run its whole Intelligence Index.

MeasureGPT-6 Sol (max)Kimi K3.1 Pro
Blended price per 1M tokens$4.00$4.00
Input / output per 1M$2.00 / $10.00$2.00 / $10.00
Cached input per 1M$0.200$0.200
Price per task: chat reply$0.0038$0.0038
Price per task: summarize a 30-page report$0.030$0.030
Price per task: code edit$0.027$0.027
Price per task: agentic coding session$0.160$0.160
Price per task: structured extraction$0.0060$0.0060
Cost to run a full benchmark suite$1.04$2.11
Output speed103 tok/s73 tok/s
Time to first answer73.9 s30.2 s
Time to a complete answer78.8 s37.0 s

Per token is not per task: on Artificial Analysis' full suite GPT-6 Sol (max) cost $1.04 and Kimi K3.1 Pro $2.11, because Kimi K3.1 Pro used about 2.0× as many tokens for the same work, which a per-token price hides.

Each model is compared at its best-ranked reasoning-effort setting. GPT-6 Sol (max) scores 66.4 and takes 74 s to its first answer token; GPT-6 Sol (xhigh) scores 64.3 in 34 s, GPT-6 Sol (high) scores 63.7 in 8 s. Kimi K3.1 Pro scores 66.9 and takes 30 s to its first answer token. Higher effort means more thinking before the answer: better scores, longer waits and more tokens billed. How reasoning effort changes scores and cost.

Every benchmark

106 benchmarks, grouped by category; each name links to the board and its leaders. † measured at another effort setting of the same model, shown for reference and not counted as a win.

MetricPublisherGPT-6 Sol (max)Kimi K3.1 Pro
BenchLeader IndexBenchLeader66.466.9
Agents & tools scoreBenchLeader59.868.0
Coding scoreBenchLeader67.2–
Composite scoreBenchLeader82.875.8
Human preference scoreBenchLeader64.6–
Knowledge scoreBenchLeader69.774.8
Long context scoreBenchLeader67.068.3
Maths scoreBenchLeader69.2–
Multimodal scoreBenchLeader61.467.0
Reasoning scoreBenchLeader71.581.3
Blended price $/MBenchLeader$4.00$4.00
Output speedBenchLeader103 tok/s73 tok/s
Time to first answerBenchLeader73.9 s30.2 s
Context windowBenchLeader1,050,000 tokens1,048,576 tokens
Reasoning
GPQA DiamondEpoch AI Benchmarking Hub94.3%–
Arena Hard PromptsArena (LMArena)1485–
LiveBench 2.0 ReasoningLiveBench88.7%†91.1%
LiveBench 1.0 ReasoningLiveBench88.7%–
Humanity's Last Exam (AA)Artificial Analysis47.9%52.5%
ARC-AGI-1ARC Prize95.5%–
ARC-AGI-2ARC Prize89.6%–
ARC-AGI-3ARC Prize23.0%–
CritPtArtificial Analysis30.9%24.6%
MysteryMechanismVals AI30.2%–
Chess PuzzlesEpoch AI Benchmarking Hub56.0%–
Mystery Game PuzzlesEpoch AI Benchmarking Hub56.0%–
LMCAEpoch AI Benchmarking Hub59.1%–
DTBenchEpoch AI Benchmarking Hub97.3%–
Coding
SciCodeSciCode57.6%–
FrontierCodeCognition49.3%–
Arena CodingArena (LMArena)1519–
Arena WebDevArena (LMArena)16811692†
LiveBench 2.0 CodingLiveBench93.1%†81.8%
LiveBench 1.0 CodingLiveBench81.8%–
SciCode (AA)Artificial Analysis57.6%60.8%
IOIVals AI82.6%–
Code MigrationVals AI57.2%–
ProgramBenchVals AI2.0%–
Vibe Code Bench v1.1Vals AI87.8%84.9%†
Show all 106 benchmarks
MetricPublisherGPT-6 Sol (max)Kimi K3.1 Pro
Coding
ALE-BenchEpoch AI Benchmarking Hub2462–
Terminal-Bench 4.0 (AA)Artificial Analysis43.9%67.2%
FrontierCode 1.1 (AA)Artificial Analysis–47.1%
Agents & tools
Terminal-BenchTerminal-Bench49.4%–
APEX-AgentsMercor54.3%–
Arena AgentArena (LMArena)8.6–
LiveBench Long AgenticLiveBench66.9%†49.5%
LiveBench BrowserLiveBench92.0%†80.0%
LiveBench Agentic CodingLiveBench52.9%–
Terminal-Bench 2.1 (Vals)Vals AI83.2%–
GDPval-AA v2.1Artificial Analysis–67.3%
ITBench SRE (AA)Artificial Analysis49.4%–
Analyst Agent (AA)Artificial Analysis–38.8%
CyberBenchVals AI78.0%–
Finance Agent v2Vals AI49.0%–
Finance Agent v2.1Vals AI–61.5%†
Harvey's Legal Agent Benchmark v1.1Vals AI–11.7%†
Harvey's Legal Agent Benchmark v1Vals AI1.7%–
Legal Research BenchVals AI28.9%37.5%†
SREBenchVals AI30.5%–
Tax Agent BenchVals AI15.0%24.9%†
Terminal-Bench 4.0 (Vals)Vals AI44.4%63.6%†
Terminal-Bench ScienceVals AI30.0%–
Arena SearchArena (LMArena)1228–
Vending-Bench 2Andon Labs14427.9†–
AutomationBenchArtificial Analysis61.6%73.3%
GDP.pdf (AA)Artificial Analysis25.2%31.4%
Harvey LAB-AA v1.1Harvey3.6%–
AA-Briefcase v1.1Artificial Analysis14771678
Terminal-Bench-Science 0.1 (AA)Artificial Analysis30.0%34.3%
CWE-Bench (AA)Artificial Analysis64.2%60.8%
DeepSec-Bench (AA)Artificial Analysis46.3%36.7%
CyberGym end-to-end (AA)Artificial Analysis0.0%94.7%
FACTS SearchGoogle86.2%†–
Maths
FrontierMath Tiers 1–3Epoch AI Benchmarking Hub89.8%–
FrontierMath Tier 4Epoch AI Benchmarking Hub90.0%–
OTIS Mock AIMEEpoch AI Benchmarking Hub100.0%–
ProofBenchVals AI83.0%†–
LiveBench MathematicsLiveBench96.4%–
Arena MathsArena (LMArena)1450–
Knowledge
SimpleQA VerifiedEpoch AI Benchmarking Hub60.7%–
LiveBench 2.0 Data AnalysisLiveBench81.2%†79.1%
LiveBench ResearchLiveBench69.3%†77.9%
LiveBench 1.0 Data AnalysisLiveBench81.2%–
AA-OmniscienceArtificial Analysis27.129.5
PRBench LegalScale AI SEAL38.6%†–
BioMysteryBenchVals AI74.8%–
Excel Modeling BenchmarkVals AI71.5%–
Excel Modeling Benchmark v1.1Vals AI–70.0%†
MedCodeVals AI47.1%–
MedScribeVals AI82.0%–
Public Benefits Bench v1.1Vals AI56.6%–
EBR-benchEpoch AI Benchmarking Hub53.3%–
GDP.pdfEpoch AI Benchmarking Hub26.4%–
AA-Omniscience: accuracyArtificial Analysis54.5%51.0%
AA-Omniscience: non-hallucinationArtificial Analysis39.9%56.1%
Instruction following
LiveBench LanguageLiveBench85.3%–
LiveBench Instruction FollowingLiveBench68.6%–
Arena Instruction FollowingArena (LMArena)1450–
Human preference
Arena TextArena (LMArena)1459–
Arena Creative WritingArena (LMArena)1435–
Arena Multi-turnArena (LMArena)1468–
Arena Longer QueriesArena (LMArena)1468–
Multimodal
Arena VisionArena (LMArena)1240–
LiveBench DesignLiveBench82.2%†77.8%
MMMU-ProArtificial Analysis83.0%83.9%
SAGEVals AI44.8%–
Blueprint-Bench 2Epoch AI Benchmarking Hub36.9%†–
AA-3DArtificial Analysis11211110
Long context
AA-LCRArtificial Analysis83.7%86.3%
MLCRArtificial Analysis33.9%–
Composite
Epoch Capabilities IndexEpoch AI Benchmarking Hub163.7†–
LiveBench 2.0LiveBench81.9%†76.7%
LiveBench 1.0LiveBench79.3%–
AA Intelligence Index v4.3.2Artificial Analysis47.655.1
Vals IndexVals AI–62.5†
Vals Finance IndexVals AI–56.0%†
Vals RSI IndexVals AI28.1%–
Vals Science IndexVals AI45.0%–
AA Cyber IndexArtificial Analysis36.864.1
Safety & honesty
FORTRESSScale AI SEAL13.5%†–

Data as of 2026-10-25. Best configuration of each model; every score links to its source on the model pages.

What changed

  • GPT-6 Sol (max): 1 score revision.
  • Kimi K3.1 Pro: 3 new results (Analyst Agent (AA), Terminal-Bench-Science 0.1 (AA), AA-3D).
  • Kimi K3.1 Pro: BenchLeader Index 65.6 → 66.8.
  • Kimi K3.1 Pro: 5 new results (FrontierCode 1.1 (AA), AA Cyber Index, CWE-Bench (AA)…).
  • GPT-6 Sol (max): 3 new results (Harvey's Legal Agent Benchmark v1, Vals RSI Index, Vals Science Index).
  • Kimi K3.1 Pro: first results.
  • GPT-6 Sol (max): 1 score revision.
  • GPT-6 Sol (max): 2 score revisions.
  • GPT-6 Sol (max): BenchLeader Index 65.6 → 66.6.
  • GPT-6 Sol (max): 3 new results (GDPval-AA v2.1, AA-Omniscience: accuracy, AA-Omniscience: non-hallucination).

Rankings: Best LLM overall · Best LLM for coding · Best LLM for agents · Best cheap LLMs

GPT-6 Sol vs Kimi K3.1 Pro: questions

Is GPT-6 Sol better than Kimi K3.1 Pro?
GPT-6 Sol (max) and Kimi K3.1 Pro are neck and neck on quality (66.4 vs 66.9, within the ±7.3 margin). The BenchLeader Index combines every independent quality benchmark; the two are within the margin of error as of 2026-10-25, so check the category scores for your use.
Which is cheaper, GPT-6 Sol or Kimi K3.1 Pro, and will that change?
They cost the same: $4.00 per million tokens blended. No price change has been announced for either.
Is GPT-6 Sol better than Kimi K3.1 Pro for agents and tool use?
Kimi K3.1 Pro scores higher in agentic tasks (68 vs 60 on the category index, where 50 is average). On CWE-Bench (AA), the top shared agents & tools benchmark, it is 64.2% for GPT-6 Sol against 60.8% for Kimi K3.1 Pro.
Which is better for long documents?
Kimi K3.1 Pro scores higher on long-context benchmarks (68 vs 67). Both take about 1.1M tokens: GPT-6 Sol 1,050,000, Kimi K3.1 Pro 1,048,576.
Which has lower latency?
Kimi K3.1 Pro answers first: 30.2 s against 73.9 s to the first answer token, as Artificial Analysis measures it. Reasoning effort drives most of this: a higher setting thinks longer before it answers.
Which is faster, GPT-6 Sol or Kimi K3.1 Pro?
GPT-6 Sol streams faster: 103 against 73 output tokens per second.
Do independent benchmarks agree on GPT-6 Sol vs Kimi K3.1 Pro?
Across the 18 benchmarks both have, GPT-6 Sol leads 5, Kimi K3.1 Pro leads 13. Every overall index that rates both puts Kimi K3.1 Pro ahead.
When was Kimi K3.1 Pro released?
Kimi K3.1 Pro was released on 23 Oct 2026.