GPT-6.1 Terra vs Kimi K3.1 Pro
Kimi K3.1 Pro leads GPT-6.1 Terra on coding, 82.2 to 77.4 on the Vibe Coding Index, and GPT-6.1 Terra costs 2.0x less per output token ($5.00 vs $10.00 per million). Updated October 29, 2026; 25 benchmarks have a result for both.
GPT-6.1 Terra or Kimi K3.1 Pro: which to pick
Pick Kimi K3.1 Pro for coding: it scores 82.2 on the Vibe Coding Index against 77.4 for GPT-6.1 Terra.
Pick GPT-6.1 Terra for output tokens 2.0x cheaper ($5.00 vs $10.00 per million) and a larger context window (1.05M against 1.05M tokens).
- Shared results
- 25
- GPT-6.1 Terra only
- 11
- Kimi K3.1 Pro only
- 10
- Like-for-like categories
- 6 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.
Coding
Vibe Coding Index, six public coding benchmarks
Kimi K3.1 Pro
Kimi K3.1 Pro scores 82.2 against 77.4.
4 benchmarks behind each score
Intelligence
AA Intelligence Index
GPT-6.1 Terra
GPT-6.1 Terra leads, 51.0 against 46.0.
Same board, both measured
Web design
Design Arena: websites
Kimi K3.1 Pro
Kimi K3.1 Pro leads, 1325 against 1283.
Same board, both measured
General
Vals Index
Kimi K3.1 Pro
Kimi K3.1 Pro leads, 62.5% against 60.5%.
Same board, both measured
Long documents
Listed context window
GPT-6.1 Terra
GPT-6.1 Terra takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
GPT-6.1 Terra
GPT-6.1 Terra $0.0035, Kimi K3.1 Pro $0.0070 per turn.
List prices
At a glance
- Coding index
- GPT-6.1 Terra 77.4 from 4 benchmarks, Kimi K3.1 Pro 82.2 from 4 benchmarks.
- Widest category
- Agentic work, 10.3 points apart on average over 6 shared benchmarks.
- Widest single gap
- ALE-Bench: GPT-6.1 Terra 2608.8 against Kimi K3.1 Pro 1932.8, 22.5 points apart on a 0 to 100 scale.
- Output price
- GPT-6.1 Terra $5.00 against Kimi K3.1 Pro $10.00 per million output tokens, 2.0x apart.
- Context window
- GPT-6.1 Terra takes 1.05M tokens, Kimi K3.1 Pro 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.
| Category | GPT-6.1 Terra | Bars | Kimi K3.1 Pro | Ties |
|---|---|---|---|---|
| Coding | 3 | 5 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 2 | 4 | ||
| Reasoning | 0 | 2 | ||
| Web design | 1 | 4 | ||
| General | 1 | 2 | ||
| All shared boards | 8 | 17 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index35
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| LiveBench coding | 94.3% | 81.8% | GPT-6.1 Terra |
| LMArena WebDev | 1673 | 1695 | Kimi K3.1 Pro |
| Terminal-Bench 4 (Vals AI) | 49.5% | 63.6% | Kimi K3.1 Pro |
| Vibe Code Bench (Vals AI) | 84.0% | 84.9% | Kimi K3.1 Pro |
| IOI (Vals AI) | Not measured | 81.9% | Only Kimi K3.1 Pro measured |
| SciCode | 55.1% | 60.8% | Kimi K3.1 Pro |
| ALE-Bench | 2608.8 | 1932.8 | GPT-6.1 Terra |
| LMArena WebDev: React | 1657 | 1701 | Kimi K3.1 Pro |
| LMArena WebDev: HTML | 1719 | 1706 | GPT-6.1 Terra |
| Neither model has a result on the other 34 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| AA Intelligence Index | 51.0 | 46.0 | GPT-6.1 Terra |
| Neither model has a result on the other 1 board here | |||
Agentic workLike-for-likePublic boards, shown as published, kept out of the index24
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| LiveBench research | 73.9% | 77.9% | Kimi K3.1 Pro |
| LiveBench browser | 93.1% | 75.9% | GPT-6.1 Terra |
| LiveBench long agentic | 48.6% | 39.1% | GPT-6.1 Terra |
| Tax Agent Bench (Vals AI) | 15.2% | 24.9% | Kimi K3.1 Pro |
| Legal Research Bench (Vals AI) | 26.0% | 37.5% | Kimi K3.1 Pro |
| Harvey's Legal Agent Benchmark (Vals AI) | 1.7% | 11.7% | Kimi K3.1 Pro |
| BioMysteryBench (Vals AI) | Not measured | 75.6% | Only Kimi K3.1 Pro measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 31.4% | Only Kimi K3.1 Pro measured |
| Vals Science Index | Not measured | 44.4% | Only Kimi K3.1 Pro measured |
| APEX-Agents | 68.3% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 32 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| LiveBench reasoning | 88.7% | 91.1% | Kimi K3.1 Pro |
| MysteryMechanism (Vals AI) | Not measured | 26.1% | Only Kimi K3.1 Pro measured |
| Humanity's Last Exam (Artificial Analysis run) | 46.2% | 52.5% | Kimi K3.1 Pro |
| GPQA Diamond (Epoch AI run) | 94.3% | Not measured | Only GPT-6.1 Terra measured |
| Mystery game puzzles | 74.0% | Not measured | Only GPT-6.1 Terra measured |
| EBR-bench | 78.1% | Not measured | Only GPT-6.1 Terra measured |
| Humanity's Last Exam (Scale run) | 35.7% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 16 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index5 boards, none shared
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| OTIS Mock AIME | 100.0% | Not measured | Only GPT-6.1 Terra measured |
| FrontierMath, tiers 1 to 3 | 90.9% | Not measured | Only GPT-6.1 Terra measured |
| FrontierMath, tier 4 | 92.7% | Not measured | Only GPT-6.1 Terra measured |
| ProofBench | Not measured | 91.0% | Only Kimi K3.1 Pro measured |
| MathArena | Not measured | 59.6% | Only Kimi K3.1 Pro measured |
| Neither model has a result on the other 9 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| SimpleQA Verified | 57.3% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 19 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index14
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| Design Arena: websites | 1283 | 1325 | Kimi K3.1 Pro |
| Design Arena: UI components | 1277 | 1400 | Kimi K3.1 Pro |
| Design Arena: game dev | 1348 | 1410 | Kimi K3.1 Pro |
| Design Arena: data viz | Not measured | 1300 | Only Kimi K3.1 Pro measured |
| Design Arena: 3D | Not measured | 1451 | Only Kimi K3.1 Pro measured |
| Design Arena: all code categories | 1295 | 1354 | Kimi K3.1 Pro |
| Design Arena: SVG | Not measured | 1328 | Only Kimi K3.1 Pro measured |
| LiveBench design | 82.3% | 77.8% | 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 index12
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| Vals Index | 60.5% | 62.5% | Kimi K3.1 Pro |
| LiveBench data analysis | 82.3% | 79.1% | GPT-6.1 Terra |
| Long context reasoning (AA-LCR) | 82.7% | 86.3% | Kimi K3.1 Pro |
| Furniture assembly | 79.2% | Not measured | Only GPT-6.1 Terra measured |
| MultiChallenge | 74.2% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 43 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-6.1 Terra | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| 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 costs less
Repository review
50K input + 3K output tokens
GPT-6.1 Terra costs less
Agent loop
200K input + 10K output tokens
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.
| Specification | OpenAI GPT-6.1 Terra | MoonshotAI Kimi K3.1 Pro |
|---|---|---|
| Maker | OpenAI | Moonshot AI |
| Weights | No public weights listed | No public weights listed |
| Released | October 26, 2026 | October 23, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $1.00 | $2.00 |
| Output $/Mtok | $5.00 | $10.00 |
| Coding index | 77.4 | 82.2 |
| Independent measurements behind it | 4 | 4 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-6.1 Terra better than Kimi K3.1 Pro for coding?
Pick Kimi K3.1 Pro for coding: it scores 82.2 on the Vibe Coding Index against 77.4 for GPT-6.1 Terra. Pick GPT-6.1 Terra for output tokens 2.0x cheaper ($5.00 vs $10.00 per million) and a larger context window (1.05M against 1.05M tokens).
Which is cheaper, GPT-6.1 Terra or Kimi K3.1 Pro?
GPT-6.1 Terra costs $1.00 per million input tokens and $5.00 per million output tokens; Kimi K3.1 Pro costs $2.00 and $10.00. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT-6.1 Terra or Kimi K3.1 Pro?
GPT-6.1 Terra, with 1.05M tokens against 1.05M.
How many benchmarks is the GPT-6.1 Terra vs Kimi K3.1 Pro comparison based on?
25 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 K3.1 Pro's on 4. Where only one model has a result, the page says so instead of naming a winner.