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GPT-5.6 Terra vs Kimi K2.6

GPT-5.6 Terra leads Kimi K2.6 on coding, 63.9 to 52.1 on the Vibe Coding Index, and Kimi K2.6 costs 3.0x less per output token ($4.00 vs $12.00 per million). Updated October 22, 2026; 103 benchmarks have a result for both.

Replace GPT-5.6 Terra Replace Kimi K2.6
GPT-5.6 TerraOpenAI
Coding
63.9
Overall
68.1
Output $/M
$12.00
57
Kimi K2.6Moonshot AI
Coding
52.1
Overall
60.5
Output $/M
$4.00
46
vs boards won of 103 shared

GPT-5.6 Terra or Kimi K2.6: which to pick

Pick GPT-5.6 Terra for coding: it scores 63.9 on the Vibe Coding Index against 52.1 for Kimi K2.6.

Pick Kimi K2.6 for output tokens 3.0x cheaper ($4.00 vs $12.00 per million) and a lower cost per solved task ($0.35 against $0.42).

Model AGPT-5.6 TerraOpenAI63.9/1006 independent benchmarks$0.42 per solved taskModel BKimi K2.6Moonshot AI52.1/1003 independent benchmarks$0.35 per solved task
Shared results
103
GPT-5.6 Terra only
24
Kimi K2.6 only
6
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-5.6 Terra 63.9 from 6 benchmarks, Kimi K2.6 52.1 from 3 benchmarks.
Widest category
Math, 22.9 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: GPT-5.6 Terra 74.0% against Kimi K2.6 16.0%, 58.0 points apart on a 0 to 100 scale.
Output price
GPT-5.6 Terra $12.00 against Kimi K2.6 $4.00 per million output tokens, 3.0x apart.
Context window
GPT-5.6 Terra takes 1.05M tokens, Kimi K2.6 262K.

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-5.6 TerraBarsKimi K2.6Ties
Coding143
Intelligence20
Agentic work77
Reasoning93
Math42
Knowledge65
Web design26
General1320
All shared boards5746
CodingLike-for-likeSix of these boards feed the Vibe Coding Index143
Coding benchmarks for GPT-5.6 Terra and Kimi K2.6
BenchmarkGPT-5.6 TerraKimi K2.6Leader
LiveBench coding86.2%Not measuredOnly GPT-5.6 Terra measured
LMArena WebDev15221509GPT-5.6 Terra
AA Coding Index76.761.8GPT-5.6 Terra
LiveCodeBench (Vals AI)85.9%86.8%Kimi K2.6
SWE-bench Verified (Vals AI)95.4%76.2%GPT-5.6 Terra
Terminal-Bench 4 (Vals AI)22.7%Not measuredOnly GPT-5.6 Terra measured
Vibe Code Bench (Vals AI)74.6%37.9%GPT-5.6 Terra
Code migration (Vals AI)47.8%27.8%GPT-5.6 Terra
ProgramBench (Vals AI)0.5%0.0%GPT-5.6 Terra
IOI (Vals AI)87.6%Not measuredOnly GPT-5.6 Terra measured
Terminal-Bench 2.1 (Vals AI)77.5%53.6%GPT-5.6 Terra
Vibe Code Bench 1-100 (Vals AI)14.8%Not measuredOnly GPT-5.6 Terra measured
SkillsBench (Vals AI)58.9%Not measuredOnly GPT-5.6 Terra measured
CyberBench (Vals AI)72.1%Not measuredOnly GPT-5.6 Terra measured
SciCode55.0%51.5%GPT-5.6 Terra
Terminal-Bench Hard (Artificial Analysis run)62.9%43.9%GPT-5.6 Terra
FrontierCode41.3%Not measuredOnly GPT-5.6 Terra measured
WeirdML78.3%55.9%GPT-5.6 Terra
ALE-Bench1951.41092.7GPT-5.6 Terra
LMArena Text: coding14851489Kimi K2.6
LMArena Text: software and IT14821484Kimi K2.6
LMArena WebDev: React15131505GPT-5.6 Terra
LMArena WebDev: HTML15261485GPT-5.6 Terra
LMArena WebDev: from an image15411521GPT-5.6 Terra
SciCode10.8%Not measuredOnly GPT-5.6 Terra measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5.6 Terra and Kimi K2.6
BenchmarkGPT-5.6 TerraKimi K2.6Leader
AA Intelligence Index42.127.0GPT-5.6 Terra
Epoch Capabilities Index160.1150.9GPT-5.6 Terra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index77
Agentic work benchmarks for GPT-5.6 Terra and Kimi K2.6
BenchmarkGPT-5.6 TerraKimi K2.6Leader
AA Agentic Index43.220.5GPT-5.6 Terra
Design Arena: agents building web apps11201268Kimi K2.6
Design Arena: agents building full-stack apps10611155Kimi K2.6
Design Arena: agents building mobile apps11111156Kimi K2.6
Design Arena: agents building Android apps10611161Kimi K2.6
Design Arena: agents building Godot gamesNot measured1120Only Kimi K2.6 measured
Design Arena: agents building games10831141Kimi K2.6
Design Arena: HTML slides10571135Kimi K2.6
Design Arena: PowerPoint slides11071105GPT-5.6 Terra
Design Arena: spreadsheetsNot measured1276Only Kimi K2.6 measured
LiveBench research60.4%Not measuredOnly GPT-5.6 Terra measured
LiveBench browser84.0%Not measuredOnly GPT-5.6 Terra measured
LiveBench long agentic48.4%Not measuredOnly GPT-5.6 Terra measured
SREBench (Vals AI)9.5%Not measuredOnly GPT-5.6 Terra measured
Finance Agent (Vals AI)54.4%44.9%GPT-5.6 Terra
Tax Agent Bench (Vals AI)30.0%12.4%GPT-5.6 Terra
Legal Research Bench (Vals AI)41.4%15.9%GPT-5.6 Terra
Excel Modeling Benchmark (Vals AI)66.2%57.9%GPT-5.6 Terra
Terminal-Bench-Science (Vals AI)10.0%Not measuredOnly GPT-5.6 Terra measured
τ²-Bench Telecom86.3%95.9%Kimi K2.6
APEX-Agents58.2%Not measuredOnly GPT-5.6 Terra measured
OSWorld 2.0Not measured4.6%Only Kimi K2.6 measured
BALROG53.2%Not measuredOnly GPT-5.6 Terra measured
Vending-Bench 2$7,343$6,205GPT-5.6 Terra
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index93
Reasoning benchmarks for GPT-5.6 Terra and Kimi K2.6
BenchmarkGPT-5.6 TerraKimi K2.6Leader
GPQA Diamond90.9%89.1%GPT-5.6 Terra
LiveBench reasoning90.6%Not measuredOnly GPT-5.6 Terra measured
MMMU Pro (Vals AI)86.5%86.3%GPT-5.6 Terra
GPQA Diamond (Artificial Analysis run)92.5%91.1%GPT-5.6 Terra
Humanity's Last Exam (Artificial Analysis run)42.9%37.5%GPT-5.6 Terra
GPQA Diamond (Epoch AI run)93.3%90.8%GPT-5.6 Terra
ARC-AGI96.5%Not measuredOnly GPT-5.6 Terra measured
ARC-AGI-283.9%Not measuredOnly GPT-5.6 Terra measured
SimpleBench48.9%Not measuredOnly GPT-5.6 Terra measured
Chess puzzles47.0%20.0%GPT-5.6 Terra
Mystery game puzzles35.0%18.0%GPT-5.6 Terra
EBR-benchNot measured2.4%Only Kimi K2.6 measured
LMArena Text: hard prompts14691470Kimi K2.6
LMArena Text: expert14961491GPT-5.6 Terra
LMArena Text: hard prompts in English14651471Kimi K2.6
LMArena Vision: diagrams12951298Kimi K2.6
LMArena Vision: homework13121310GPT-5.6 Terra
Kagi LLM Benchmark51.3%Not measuredOnly GPT-5.6 Terra measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index42
Math benchmarks for GPT-5.6 Terra and Kimi K2.6
BenchmarkGPT-5.6 TerraKimi K2.6Leader
OTIS Mock AIME99.7%96.1%GPT-5.6 Terra
FrontierMath, tiers 1 to 386.0%57.2%GPT-5.6 Terra
FrontierMath, tier 470.7%25.6%GPT-5.6 Terra
ProofBench74.0%16.0%GPT-5.6 Terra
LMArena Text: math14651474Kimi K2.6
LMArena Text: mathematical work14781480Kimi K2.6
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index65
Knowledge benchmarks for GPT-5.6 Terra and Kimi K2.6
BenchmarkGPT-5.6 TerraKimi K2.6Leader
MMLU Pro86.7%87.6%Kimi K2.6
LegalBench (Vals AI)85.1%84.7%GPT-5.6 Terra
CaseLaw (Vals AI)Not measured61.2%Only Kimi K2.6 measured
CorpFin (Vals AI)65.3%66.7%Kimi K2.6
TaxEval (Vals AI)76.2%74.7%GPT-5.6 Terra
MortgageTax (Vals AI)67.3%65.8%GPT-5.6 Terra
MedCode (Vals AI)43.4%40.1%GPT-5.6 Terra
SimpleQA Verified43.2%34.9%GPT-5.6 Terra
LMArena Text: science14521468Kimi K2.6
LMArena Text: medicine and healthcare14301457Kimi K2.6
LMArena Text: legal and government14611462Kimi K2.6
LMArena Text: business and finance14481445GPT-5.6 Terra
FACTS Benchmark Suite52.0%Not measuredOnly GPT-5.6 Terra measured
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index26
Web design benchmarks for GPT-5.6 Terra and Kimi K2.6
BenchmarkGPT-5.6 TerraKimi K2.6Leader
Design Arena: websites12681269Kimi K2.6
Design Arena: UI components12561264Kimi K2.6
Design Arena: game dev12291250Kimi K2.6
Design Arena: data viz12401249Kimi K2.6
Design Arena: 3D11341267Kimi K2.6
Design Arena: all code categories12401271Kimi K2.6
Design Arena: SVG12191180GPT-5.6 Terra
Design Arena: ASCII art11781165GPT-5.6 Terra
LiveBench design76.0%Not measuredOnly GPT-5.6 Terra measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index1320
General benchmarks for GPT-5.6 Terra and Kimi K2.6
BenchmarkGPT-5.6 TerraKimi K2.6Leader
LiveBench data analysis79.3%Not measuredOnly GPT-5.6 Terra measured
Public Benefits Bench (Vals AI)62.4%56.6%GPT-5.6 Terra
SAGE (Vals AI)47.0%50.2%Kimi K2.6
MedScribe (Vals AI)82.9%78.2%GPT-5.6 Terra
Vals Multimodal Index65.1%56.4%GPT-5.6 Terra
IFBench71.2%76.0%Kimi K2.6
Long context reasoning (AA-LCR)83.0%81.0%GPT-5.6 Terra
DTBench93.3%90.9%GPT-5.6 Terra
LMCA54.9%37.3%GPT-5.6 Terra
Surface Evolver Bench83.8%Not measuredOnly GPT-5.6 Terra measured
Furniture assembly54.2%21.7%GPT-5.6 Terra
ExploitBenchNot measured18.4%Only Kimi K2.6 measured
LMArena Text14481455Kimi K2.6
LMArena Text: instruction following14561451GPT-5.6 Terra
LMArena Text: creative writing14131434Kimi K2.6
LMArena Vision12711282Kimi K2.6
LMArena Text: English14491460Kimi K2.6
LMArena Text: non-English14411446Kimi K2.6
LMArena Text: Chinese15141520Kimi K2.6
LMArena Text: German14601451GPT-5.6 Terra
LMArena Text: Japanese14541443GPT-5.6 Terra
LMArena Text: Korean14271427Kimi K2.6
LMArena Text: French14661471Kimi K2.6
LMArena Text: Spanish14511464Kimi K2.6
LMArena Text: Russian14521446GPT-5.6 Terra
LMArena Text: Polish14461438GPT-5.6 Terra
LMArena Text: multi-turn14531453Kimi K2.6
LMArena Text: longer queries14541468Kimi K2.6
LMArena Text: writing and language14311439Kimi K2.6
LMArena Text: entertainment and media14181428Kimi K2.6
LMArena Vision: English12721287Kimi K2.6
LMArena Vision: Chinese13371346Kimi K2.6
LMArena Vision: reading text12781291Kimi K2.6
LMArena Vision: humor12361280Kimi K2.6
LMArena Vision: creative writing12481273Kimi K2.6
LMArena Document14721451GPT-5.6 Terra
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.6 Terra and Kimi K2.6
BenchmarkGPT-5.6 TerraKimi K2.6Leader
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-5.6 Terra$0.0080Fits in one request
Kimi K2.6$0.0029Fits in one request

Kimi K2.6 costs less

Repository review

50K input + 3K output tokens

GPT-5.6 Terra$0.136Fits in one request
Kimi K2.6$0.059Fits in one request

Kimi K2.6 costs less

Agent loop

200K input + 10K output tokens

GPT-5.6 Terra$0.520Fits in one request
Kimi K2.6$0.230Fits in one request

Kimi K2.6 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-5.6 Terra and Kimi K2.6
SpecificationOpenAI GPT-5.6 TerraMoonshotAI Kimi K2.6
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedJuly 9, 2026April 20, 2026
Context window1.05M262K
Input $/Mtok$2.00$0.95
Output $/Mtok$12.00$4.00
Coding index63.952.1
Independent measurements behind it63
Cost per solved task$0.42$0.35
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.6 Terra better than Kimi K2.6 for coding?

Pick GPT-5.6 Terra for coding: it scores 63.9 on the Vibe Coding Index against 52.1 for Kimi K2.6. Pick Kimi K2.6 for output tokens 3.0x cheaper ($4.00 vs $12.00 per million) and a lower cost per solved task ($0.35 against $0.42).

Which is cheaper, GPT-5.6 Terra or Kimi K2.6?

GPT-5.6 Terra costs $2.00 per million input tokens and $12.00 per million output tokens; Kimi K2.6 costs $0.95 and $4.00. Per solved SWE-bench Verified task, GPT-5.6 Terra costs $0.42 and Kimi K2.6 $0.35.

Which has the bigger context window, GPT-5.6 Terra or Kimi K2.6?

GPT-5.6 Terra, with 1.05M tokens against 262K.

How many benchmarks is the GPT-5.6 Terra vs Kimi K2.6 comparison based on?

103 benchmarks have a result for both models as of October 22, 2026. GPT-5.6 Terra's coding index rests on 6 independent benchmarks and Kimi K2.6's on 3. Where only one model has a result, the page says so instead of naming a winner.

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