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GPT-6.1 Terra vs Kimi K3

GPT-6.1 Terra leads Kimi K3 on coding, 77.4 to 62.3 on the Vibe Coding Index, and GPT-6.1 Terra costs 3.0x less per output token ($5.00 vs $15.00 per million). Updated October 29, 2026; 33 benchmarks have a result for both.

Replace GPT-6.1 Terra Replace Kimi K3
GPT-6.1 TerraOpenAI
Coding
77.4
Overall
76.8
Output $/M
$5.00
19
Kimi K3Moonshot AI
Coding
62.3
Overall
68.4
Output $/M
$15.00
14
vs boards won of 33 shared

GPT-6.1 Terra or Kimi K3: which to pick

Pick GPT-6.1 Terra for coding: it scores 77.4 on the Vibe Coding Index against 62.3 for Kimi K3, though on 4 benchmarks against 6.

Pick Kimi K3 for work measured by Vibe Code Bench (Vals AI) or SciCode, where it leads.

Model AGPT-6.1 TerraOpenAI77.4/1004 independent benchmarksNo cost per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
33
GPT-6.1 Terra only
3
Kimi K3 only
88
Like-for-like categories
7 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 Terra 77.4 from 4 benchmarks, Kimi K3 62.3 from 6 benchmarks.
Widest category
Math, 25.0 points apart on average over 3 shared benchmarks.
Widest single gap
FrontierMath, tier 4: GPT-6.1 Terra 92.7% against Kimi K3 39.0%, 53.7 points apart on a 0 to 100 scale.
Output price
GPT-6.1 Terra $5.00 against Kimi K3 $15.00 per million output tokens, 3.0x apart.
Context window
GPT-6.1 Terra takes 1.05M tokens, Kimi K3 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 TerraBarsKimi K3Ties
Coding53
Agentic work34
Reasoning32
Math30
Knowledge10
Web design14
General31
All shared boards1914
CodingLike-for-likeSix of these boards feed the Vibe Coding Index53
Coding benchmarks for GPT-6.1 Terra and Kimi K3
BenchmarkGPT-6.1 TerraKimi K3Leader
LiveBench coding94.3%59.3%GPT-6.1 Terra
LMArena WebDev16731656GPT-6.1 Terra
AA Coding IndexNot measured76.2Only Kimi K3 measured
LiveCodeBench (Vals AI)Not measured87.2%Only Kimi K3 measured
SWE-bench Verified (Vals AI)Not measured93.4%Only Kimi K3 measured
Terminal-Bench 4 (Vals AI)49.5%17.2%GPT-6.1 Terra
Vibe Code Bench (Vals AI)84.0%85.0%Kimi K3
Code migration (Vals AI)Not measured16.1%Only Kimi K3 measured
ProgramBench (Vals AI)Not measured2.0%Only Kimi K3 measured
IOI (Vals AI)Not measured48.9%Only Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)Not measured80.9%Only Kimi K3 measured
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)Not measured18.2%Only Kimi K3 measured
CyberBench (Vals AI)Not measured75.2%Only Kimi K3 measured
SciCode55.1%59.5%Kimi K3
FrontierCodeNot measured44.2%Only Kimi K3 measured
FrontierSWENot measured25.9%Only Kimi K3 measured
WeirdMLNot measured82.6%Only Kimi K3 measured
ALE-Bench2608.81524.5GPT-6.1 Terra
LMArena Text: codingNot measured1508Only Kimi K3 measured
LMArena Text: software and ITNot measured1499Only Kimi K3 measured
LMArena WebDev: React16571672Kimi K3
LMArena WebDev: HTML17191641GPT-6.1 Terra
LMArena WebDev: from an imageNot measured1579Only Kimi K3 measured
SWE-Bench Pro V2Not measured97.7%Only Kimi K3 measured
Neither model has a result on the other 18 boards here
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Intelligence benchmarks for GPT-6.1 Terra and Kimi K3
BenchmarkGPT-6.1 TerraKimi K3Leader
AA Intelligence Index51.0Not measuredOnly GPT-6.1 Terra measured
Epoch Capabilities IndexNot measured157.9Only Kimi K3 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index34
Agentic work benchmarks for GPT-6.1 Terra and Kimi K3
BenchmarkGPT-6.1 TerraKimi K3Leader
AA Agentic IndexNot measured50.0Only Kimi K3 measured
Design Arena: agents building web appsNot measured1296Only Kimi K3 measured
Design Arena: agents building full-stack appsNot measured1315Only Kimi K3 measured
Design Arena: agents building mobile appsNot measured1267Only Kimi K3 measured
Design Arena: agents building Android appsNot measured1255Only Kimi K3 measured
Design Arena: agents building Godot gamesNot measured1223Only Kimi K3 measured
Design Arena: agents building gamesNot measured1217Only Kimi K3 measured
Design Arena: HTML slidesNot measured1153Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1219Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1114Only Kimi K3 measured
LiveBench research73.9%79.0%Kimi K3
LiveBench browser93.1%75.2%GPT-6.1 Terra
LiveBench long agentic48.6%26.4%GPT-6.1 Terra
Finance Agent (Vals AI)Not measured53.1%Only Kimi K3 measured
Tax Agent Bench (Vals AI)15.2%33.4%Kimi K3
Legal Research Bench (Vals AI)26.0%46.1%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)1.7%12.9%Kimi K3
Excel Modeling Benchmark (Vals AI)Not measured66.7%Only Kimi K3 measured
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)Not measured1.4%Only Kimi K3 measured
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
APEX-Agents68.3%47.8%GPT-6.1 Terra
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2Not measured$5,165Only Kimi K3 measured
MCP AtlasNot measured82.3%Only Kimi K3 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index32
Reasoning benchmarks for GPT-6.1 Terra and Kimi K3
BenchmarkGPT-6.1 TerraKimi K3Leader
GPQA DiamondNot measured92.9%Only Kimi K3 measured
LiveBench reasoning88.7%90.7%Kimi K3
MMMU Pro (Vals AI)Not measured88.2%Only Kimi K3 measured
GPQA Diamond (Artificial Analysis run)Not measured93.5%Only Kimi K3 measured
Humanity's Last Exam (Artificial Analysis run)46.2%46.9%Kimi K3
GPQA Diamond (Epoch AI run)94.3%93.1%GPT-6.1 Terra
ARC-AGINot measured94.5%Only Kimi K3 measured
ARC-AGI-2Not measured60.4%Only Kimi K3 measured
SimpleBenchNot measured60.7%Only Kimi K3 measured
Chess puzzlesNot measured37.0%Only Kimi K3 measured
Mystery game puzzles74.0%26.0%GPT-6.1 Terra
EBR-bench78.1%Not measuredOnly GPT-6.1 Terra measured
LMArena Text: hard promptsNot measured1496Only Kimi K3 measured
LMArena Text: expertNot measured1520Only Kimi K3 measured
LMArena Text: hard prompts in EnglishNot measured1496Only Kimi K3 measured
Humanity's Last Exam (Scale run)35.7%22.2%GPT-6.1 Terra
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 Terra and Kimi K3
BenchmarkGPT-6.1 TerraKimi K3Leader
OTIS Mock AIME100.0%97.2%GPT-6.1 Terra
FrontierMath, tiers 1 to 390.9%72.2%GPT-6.1 Terra
FrontierMath, tier 492.7%39.0%GPT-6.1 Terra
ProofBenchNot measured87.0%Only Kimi K3 measured
LMArena Text: mathNot measured1492Only Kimi K3 measured
LMArena Text: mathematical workNot measured1504Only Kimi K3 measured
MathArenaNot measured47.5%Only Kimi K3 measured
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index10
Knowledge benchmarks for GPT-6.1 Terra and Kimi K3
BenchmarkGPT-6.1 TerraKimi K3Leader
MMLU ProNot measured88.0%Only Kimi K3 measured
LegalBench (Vals AI)Not measured86.2%Only Kimi K3 measured
CorpFin (Vals AI)Not measured71.6%Only Kimi K3 measured
TaxEval (Vals AI)Not measured75.7%Only Kimi K3 measured
MortgageTax (Vals AI)Not measured66.3%Only Kimi K3 measured
MedCode (Vals AI)Not measured49.4%Only Kimi K3 measured
SimpleQA Verified57.3%50.6%GPT-6.1 Terra
LMArena Text: scienceNot measured1508Only Kimi K3 measured
LMArena Text: medicine and healthcareNot measured1487Only Kimi K3 measured
LMArena Text: legal and governmentNot measured1502Only Kimi K3 measured
LMArena Text: business and financeNot measured1469Only Kimi K3 measured
Neither model has a result on the other 9 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index14
Web design benchmarks for GPT-6.1 Terra and Kimi K3
BenchmarkGPT-6.1 TerraKimi K3Leader
Design Arena: websites12831335Kimi K3
Design Arena: UI components12771335Kimi K3
Design Arena: game dev13481363Kimi K3
Design Arena: data vizNot measured1351Only Kimi K3 measured
Design Arena: 3DNot measured1384Only Kimi K3 measured
Design Arena: all code categories12951359Kimi K3
Design Arena: SVGNot measured1302Only Kimi K3 measured
LiveBench design82.3%77.2%GPT-6.1 Terra
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index31
General benchmarks for GPT-6.1 Terra and Kimi K3
BenchmarkGPT-6.1 TerraKimi K3Leader
Vals Index60.5%53.0%GPT-6.1 Terra
LiveBench data analysis82.3%78.7%GPT-6.1 Terra
Public Benefits Bench (Vals AI)Not measured68.2%Only Kimi K3 measured
SAGE (Vals AI)Not measured86.8%Only Kimi K3 measured
MedScribe (Vals AI)Not measured88.0%Only Kimi K3 measured
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
Long context reasoning (AA-LCR)82.7%88.7%Kimi K3
DTBenchNot measured91.2%Only Kimi K3 measured
LMCANot measured52.7%Only Kimi K3 measured
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assembly79.2%34.2%GPT-6.1 Terra
LMArena TextNot measured1476Only Kimi K3 measured
LMArena Text: instruction followingNot measured1485Only Kimi K3 measured
LMArena Text: creative writingNot measured1457Only Kimi K3 measured
LMArena Text: EnglishNot measured1481Only Kimi K3 measured
LMArena Text: non-EnglishNot measured1466Only Kimi K3 measured
LMArena Text: ChineseNot measured1531Only Kimi K3 measured
LMArena Text: GermanNot measured1489Only Kimi K3 measured
LMArena Text: JapaneseNot measured1495Only Kimi K3 measured
LMArena Text: KoreanNot measured1459Only Kimi K3 measured
LMArena Text: FrenchNot measured1486Only Kimi K3 measured
LMArena Text: SpanishNot measured1477Only Kimi K3 measured
LMArena Text: RussianNot measured1484Only Kimi K3 measured
LMArena Text: PolishNot measured1462Only Kimi K3 measured
LMArena Text: multi-turnNot measured1490Only Kimi K3 measured
LMArena Text: longer queriesNot measured1493Only Kimi K3 measured
LMArena Text: writing and languageNot measured1471Only Kimi K3 measured
LMArena Text: entertainment and mediaNot measured1452Only Kimi K3 measured
MultiChallenge74.2%Not measuredOnly GPT-6.1 Terra measured
EQ-Bench 4Not measured1319Only Kimi K3 measured
Neither model has a result on the other 18 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-6.1 Terra and Kimi K3
BenchmarkGPT-6.1 TerraKimi K3Leader
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 Terra$0.0035Fits in one request
Kimi K3$0.011Fits in one request

GPT-6.1 Terra costs less

Repository review

50K input + 3K output tokens

GPT-6.1 Terra$0.065Fits in one request
Kimi K3$0.195Fits in one request

GPT-6.1 Terra costs less

Agent loop

200K input + 10K output tokens

GPT-6.1 Terra$0.250Fits in one request
Kimi K3$0.750Fits in one request

GPT-6.1 Terra 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 Terra and Kimi K3
SpecificationOpenAI GPT-6.1 TerraMoonshotAI Kimi K3
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedOctober 26, 2026July 16, 2026
Context window1.05M1.05M
Input $/Mtok$1.00$3.00
Output $/Mtok$5.00$15.00
Coding index77.462.3
Independent measurements behind it46
Cost per solved taskNot computable$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6.1 Terra better than Kimi K3 for coding?

Pick GPT-6.1 Terra for coding: it scores 77.4 on the Vibe Coding Index against 62.3 for Kimi K3, though on 4 benchmarks against 6. Pick Kimi K3 for work measured by Vibe Code Bench (Vals AI) or SciCode, where it leads.

Which is cheaper, GPT-6.1 Terra or Kimi K3?

GPT-6.1 Terra costs $1.00 per million input tokens and $5.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, GPT-6.1 Terra or Kimi K3?

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

How many benchmarks is the GPT-6.1 Terra vs Kimi K3 comparison based on?

33 benchmarks have a result for both models as of October 29, 2026. GPT-6.1 Terra's coding index rests on 4 independent benchmarks and Kimi K3's on 6. Where only one model has a result, the page says so instead of naming a winner.

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