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GPT-5.6 Terra vs Kimi K3.1 Pro

Full profiles: GPT-5.6 Terra (OpenAI) and Kimi K3.1 Pro (Moonshot AI): every benchmark, price and rank.

Updated · Data from 8 sources

As of 24 Oct 2026, GPT-5.6 Terra (max) and Kimi K3.1 Pro are neck and neck on quality (64.4 vs 66.8, inside the ±8.0 margin of error) and cost about the same, so speed decides it: GPT-5.6 Terra (max) streams 1.6× faster. Kimi K3.1 Pro leads in every category we measure both in.

GPT-5.6 Terra 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 Pro67 vs 59 category score; GDPval-AA v2.1 67.3% vs 47.6%High
ReasoningKimi K3.1 Pro81 vs 70 category score; CritPt 24.6% vs 30.0%High
KnowledgeKimi K3.1 Pro75 vs 57 category score; AA-Omniscience 29.5 vs 0.1High
Long documentsKimi K3.1 Pro68 vs 67 category score; AA-LCR 86.3% vs 83.0%Medium
Images and other mediaKimi K3.1 Pro67 vs 64 category score; MMMU-Pro 83.9% vs 80.7%Medium
Lowest costEither$4.50 vs $4.00 per 1M blended; agentic coding session $0.168 vs $0.160–
Fastest first answerKimi K3.1 Pro27.7 s (Kimi K3.1 Pro) vs 91.6 s (GPT-5.6 Terra (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-5.6 Terra (max) and Kimi K3.1 Pro are neck and neck on quality (64.4 vs 66.8, within the ±8.0 margin).
  • GPT-5.6 Terra (max) is stronger in coding, composite, instruction following, 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-5.6 Terra (max) streams 1.6× faster (126 vs 81 tokens per second).

At a glance

SpecGPT-5.6 TerraKimi K3.1 Pro
DeveloperOpenAIMoonshot AI
Released9 Jul 202623 Oct 2026
Context window (tokens)1,050,0001,048,576
Compared atGPT-5.6 Terra (max)Kimi K3.1 Pro
Open weightsNoNo
Price in / out / cached input per 1M$2.00 / $12.00 / $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-5.6 Terra (max)Kimi K3.1 ProLeader
Reasoning70.181.3Kimi K3.1 Pro
Coding65.1–not comparable
Agents & tools58.967.3Kimi K3.1 Pro
Maths68.9–not comparable
Knowledge57.274.8Kimi K3.1 Pro
Instruction following69.9–not comparable
Multimodal63.767.0Kimi K3.1 Pro
Long context66.668.3Kimi K3.1 Pro
Composite76.675.8level

Where sources disagree

Across the 12 benchmarks both have, GPT-5.6 Terra leads 1, Kimi K3.1 Pro leads 11. Every overall index that rates both puts Kimi K3.1 Pro ahead.

Overall indexGPT-5.6 Terra (max)Kimi K3.1 ProLeader
BenchLeader Index64.466.8neck and neck
AA Intelligence Index v4.3.242.155.1Kimi 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-5.6 Terra (max)Kimi K3.1 Pro
Blended price per 1M tokens$4.50$4.00
Input / output per 1M$2.00 / $12.00$2.00 / $10.00
Cached input per 1M$0.200$0.200
Price per task: chat reply$0.0044$0.0038
Price per task: summarize a 30-page report$0.031$0.030
Price per task: code edit$0.030$0.027
Price per task: agentic coding session$0.168$0.160
Price per task: structured extraction$0.0064$0.0060
Cost to run a full benchmark suite$1.40$2.11
Output speed126 tok/s81 tok/s
Time to first answer91.6 s27.7 s
Time to a complete answer95.6 s33.9 s

Per token is not per task: on Artificial Analysis' full suite GPT-5.6 Terra (max) cost $1.40 and Kimi K3.1 Pro $2.11, because Kimi K3.1 Pro used about 1.7× 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-5.6 Terra (max) scores 64.4 and takes 92 s to its first answer token; GPT-5.6 Terra (xhigh) scores 62.8 in 7 s, GPT-5.6 Terra (high) scores 61.3 in 2 s. Kimi K3.1 Pro scores 66.8 and takes 28 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

120 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-5.6 Terra (max)Kimi K3.1 Pro
BenchLeader IndexBenchLeader64.466.8
Agents & tools scoreBenchLeader58.967.3
Coding scoreBenchLeader65.1–
Composite scoreBenchLeader76.675.8
Instruction following scoreBenchLeader69.9–
Knowledge scoreBenchLeader57.274.8
Long context scoreBenchLeader66.668.3
Maths scoreBenchLeader68.9–
Multimodal scoreBenchLeader63.767.0
Reasoning scoreBenchLeader70.181.3
Blended price $/MBenchLeader$4.50$4.00
Output speedBenchLeader126 tok/s81 tok/s
Time to first answerBenchLeader91.6 s27.7 s
Context windowBenchLeader1,050,000 tokens1,048,576 tokens
Reasoning
GPQA DiamondEpoch AI Benchmarking Hub93.3%–
SimpleBenchSimpleBench48.9%†–
Arena Hard PromptsArena (LMArena)1490†–
LiveBench 2.0 ReasoningLiveBench90.6%†91.1%
LiveBench 1.0 ReasoningLiveBench90.6%–
GPQA Diamond (AA)Artificial Analysis92.5%–
Humanity's Last Exam (AA)Artificial Analysis42.9%52.5%
GPQA Diamond (Vals)Vals AI90.9%†–
Kagi LLM BenchmarkKagi LLM Benchmark51.3%†–
ARC-AGI-1ARC Prize96.5%–
ARC-AGI-2ARC Prize83.9%–
ARC-AGI-3ARC Prize0.8%–
CritPtArtificial Analysis30.0%24.6%
Chess PuzzlesEpoch AI Benchmarking Hub47.0%–
Mystery Game PuzzlesEpoch AI Benchmarking Hub35.0%–
LMCAEpoch AI Benchmarking Hub55.0%–
DTBenchEpoch AI Benchmarking Hub93.3%–
Coding
SciCodeSciCode55.0%–
WeirdMLWeirdML78.3%†–
FrontierCodeCognition41.3%†–
Arena CodingArena (LMArena)1518†–
Arena WebDevArena (LMArena)1521†–
LiveBench 2.0 CodingLiveBench86.2%†81.8%
LiveBench 1.0 CodingLiveBench78.3%–
SciCode (AA)Artificial Analysis55.0%60.8%
Show all 120 benchmarks
MetricPublisherGPT-5.6 Terra (max)Kimi K3.1 Pro
Coding
LiveCodeBenchVals AI85.9%†–
IOIVals AI87.6%–
SWE-bench (Vals)Vals AI95.4%–
Code MigrationVals AI47.8%–
ProgramBenchVals AI0.5%–
Vibe Code Bench 1-100Vals AI14.8%–
Vibe Code Bench v1.1Vals AI74.6%–
Surface Evolver BenchEpoch AI Benchmarking Hub83.8%†–
DeepSWE v1.1Epoch AI Benchmarking Hub69.6%–
CursorBenchCursor41.3%–
ALE-BenchEpoch AI Benchmarking Hub1951.4–
Terminal-Bench 4.0 (AA)Artificial Analysis35.4%67.2%
Terminal-Bench 2.1 (AA)Artificial Analysis88.0%–
Startrise FrontendStartrise66.9%†–
FrontierCode 1.1 (AA)Artificial Analysis–47.1%
Agents & tools
Terminal-BenchTerminal-Bench21.5%–
APEX-AgentsMercor58.2%–
Arena AgentArena (LMArena)0.5†–
LiveBench Long AgenticLiveBench48.4%†49.5%
LiveBench BrowserLiveBench84.0%†80.0%
LiveBench Agentic CodingLiveBench55.0%–
Terminal-Bench HardArtificial Analysis57.6%–
τ²-Bench Telecom (AA)Artificial Analysis86.3%–
Terminal-Bench 2.1 (Vals)Vals AI77.5%–
GDPval-AA v2.1Artificial Analysis47.6%67.3%
τ³-Banking (AA)Artificial Analysis40.2%–
ITBench SRE (AA)Artificial Analysis51.0%–
APEX-Agents (AA)Artificial Analysis38.9%–
CyberBenchVals AI72.1%–
Finance Agent v2Vals AI54.4%–
Harvey's Legal Agent Benchmark v1Vals AI0.8%–
Legal Research BenchVals AI41.4%–
SkillsBenchVals AI58.9%–
SREBenchVals AI9.5%–
Tax Agent BenchVals AI30.0%–
Terminal-Bench 4.0 (Vals)Vals AI22.7%–
Terminal-Bench ScienceVals AI10.0%–
BALROGBALROG53.2%–
Vending-Bench 2Andon Labs7343.2†–
AutomationBenchArtificial Analysis59.6%73.3%
GDP.pdf (AA)Artificial Analysis24.0%31.4%
EnterpriseOps-GymArtificial Analysis38.5%–
AA-Briefcase v1.1Artificial Analysis–1678
Terminal-Bench-Science 0.1 (AA)Artificial Analysis13.8%–
CWE-Bench (AA)Artificial Analysis–60.8%
DeepSec-Bench (AA)Artificial Analysis–36.7%
CyberGym end-to-end (AA)Artificial Analysis–94.7%
FACTS SearchGoogle81.7%†–
Maths
FrontierMath Tiers 1–3Epoch AI Benchmarking Hub86.0%–
FrontierMath Tier 4Epoch AI Benchmarking Hub70.7%–
OTIS Mock AIMEEpoch AI Benchmarking Hub99.7%–
ProofBenchVals AI74.0%†–
LiveBench MathematicsLiveBench94.9%–
Arena MathsArena (LMArena)1483†–
Knowledge
SimpleQA VerifiedEpoch AI Benchmarking Hub43.2%–
LiveBench 2.0 Data AnalysisLiveBench79.3%†79.1%
LiveBench ResearchLiveBench60.4%†77.9%
LiveBench 1.0 Data AnalysisLiveBench79.3%–
AA-OmniscienceArtificial Analysis0.129.5
MMLU-ProVals AI86.7%†–
LegalBenchVals AI85.1%–
CorpFinVals AI65.3%†–
TaxEvalVals AI76.2%†–
Excel Modeling BenchmarkVals AI66.2%–
MedCodeVals AI43.4%†–
MedScribeVals AI82.9%†–
Public Benefits Bench v1.1Vals AI62.4%–
GDP.pdfEpoch AI Benchmarking Hub24.7%†–
AA-Omniscience: accuracyArtificial Analysis46.8%51.0%
AA-Omniscience: non-hallucinationArtificial Analysis12.1%56.1%
Instruction following
LiveBench LanguageLiveBench82.9%–
LiveBench Instruction FollowingLiveBench64.6%–
IFBenchArtificial Analysis71.2%–
Arena Instruction FollowingArena (LMArena)1464†–
Human preference
Arena TextArena (LMArena)1467†–
EQ-Bench 4EQ-Bench1234†–
Arena Creative WritingArena (LMArena)1429†–
Arena Multi-turnArena (LMArena)1472†–
Arena Longer QueriesArena (LMArena)1468†–
Multimodal
Arena VisionArena (LMArena)1271†–
LiveBench DesignLiveBench76.0%†77.8%
MMMU-ProArtificial Analysis80.7%83.9%
MMMU-Pro (Vals)Vals AI86.5%–
MortgageTaxVals AI67.3%†–
SAGEVals AI47.0%–
Blueprint-Bench 2Epoch AI Benchmarking Hub30.8%†–
Long context
AA-LCRArtificial Analysis83.0%86.3%
Arena DocumentArena (LMArena)1477†–
MLCRArtificial Analysis27.2%–
Composite
Epoch Capabilities IndexEpoch AI Benchmarking Hub160.1†–
LiveBench 2.0LiveBench75.0%†76.7%
LiveBench 1.0LiveBench77.9%–
AA Intelligence Index v4.3.2Artificial Analysis42.155.1
Vals Multimodal IndexVals AI65.1%†–
AA Cyber IndexArtificial Analysis–64.1

Data as of 2026-10-24. Best configuration of each model; every score links to its source on the model pages.

What changed

  • 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-5.6 Terra (max): 1 new result (Harvey's Legal Agent Benchmark v1).
  • Kimi K3.1 Pro: first results.
  • GPT-5.6 Terra (max): 1 score revision.
  • GPT-5.6 Terra (max): BenchLeader Index 63.8 → 64.4.
  • GPT-5.6 Terra (max): 5 new results (AutomationBench, GDP.pdf (AA), MLCR…).
  • GPT-5.6 Terra (max): 1 new result (SREBench); 1 score revision.
  • GPT-5.6 Terra (max): 1 score revision.
  • GPT-5.6 Terra (max): 1 score revision.

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

GPT-5.6 Terra vs Kimi K3.1 Pro: questions

Is GPT-5.6 Terra better than Kimi K3.1 Pro?
GPT-5.6 Terra (max) and Kimi K3.1 Pro are neck and neck on quality (64.4 vs 66.8, within the ±8.0 margin). The BenchLeader Index combines every independent quality benchmark; the two are within the margin of error as of 2026-10-24, so check the category scores for your use.
Which is cheaper, GPT-5.6 Terra or Kimi K3.1 Pro, and will that change?
Kimi K3.1 Pro is cheaper today: $4.00 against $4.50 per million tokens, blended at three input tokens per output token. No price change has been announced for either.
Is GPT-5.6 Terra better than Kimi K3.1 Pro for agents and tool use?
Kimi K3.1 Pro scores higher in agentic tasks (67 vs 59 on the category index, where 50 is average).
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-5.6 Terra 1,050,000, Kimi K3.1 Pro 1,048,576.
Which has lower latency?
Kimi K3.1 Pro answers first: 27.7 s against 91.6 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-5.6 Terra or Kimi K3.1 Pro?
GPT-5.6 Terra streams faster: 126 against 81 output tokens per second.
Do independent benchmarks agree on GPT-5.6 Terra vs Kimi K3.1 Pro?
Across the 12 benchmarks both have, GPT-5.6 Terra leads 1, Kimi K3.1 Pro leads 11. 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.