# GPT-5.6 Terra vs Kimi K3

> GPT-5.6 Terra and Kimi K3 score almost the same on the Noometry Index (59.2 vs 59.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-6-terra-vs-kimi-k3
- Last updated: 2026-10-12
- Shared benchmarks: 47

## Summary

- They share 47 benchmarks with published results for both. GPT-5.6 Terra scores higher in 2 categories and Kimi K3 in 8 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in multimodal, where GPT-5.6 Terra leads 47.3 to 37.8.
- The biggest single-benchmark swing is FrontierMath Tier 4: 70.7% for GPT-5.6 Terra and 39% for Kimi K3.
- GPT-5.6 Terra is cheaper at $2 / $12 per million input/output tokens, against $3 / $15 for Kimi K3.
- GPT-5.6 Terra accepts more context: 1.05M tokens versus 1.05M.
- Kimi K3 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 59.2 | 59.5 |
| Rank | 17 | 15 |
| Context | 1.05M | 1.05M |
| Input $/M | $2 | $3 |
| Output $/M | $12 | $15 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.6 Terra: 57.7 (#19)
- Kimi K3: 61.0 (#10)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| DeepSWE | 69.6% | 68.5% |
| FrontierCode | 41.3% | 44.2% |
| LMArena WebDev | 1522 | 1654 |
| SciCode | 55% | 59.5% |
| WeirdML | 78.3% | 82.6% |
| LMArena Coding | 1484 | 1508 |
| ALE-Bench | 1,951 | 1,524 |
| CursorBench | 41.3% | — |
| FrontierSWE | — | 25.9% |

## Agentic & Tool Use

- GPT-5.6 Terra: 40.1 (#25)
- Kimi K3: 41.8 (#20)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| APEX-Agents | 58.2% | 50.6% |
| GDP.pdf | 24.7% | 19% |
| Vending-Bench 2 | 7,343 | 5,165 |
| τ²-bench Banking | — | 37.1% |
| PostTrainBench | — | 32% |
| BALROG | 53.2% | — |
| GBAEval | — | 48.3% |

## Reasoning

- GPT-5.6 Terra: 60.7 (#21)
- Kimi K3: 63.0 (#17)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| ARC-AGI-2 | 83.9% | 60.4% |
| SimpleBench | 48.9% | 60.7% |
| NYT Connections (extended) | 78.4% | 93.6% |
| ARC-AGI-1 | 96.5% | 94.5% |
| CritPt | 30% | 23.4% |
| Chess Puzzles | 54% | 39% |
| LMArena Hard Prompts | 1468 | 1496 |
| Mystery Game Puzzles | 35% | 26% |
| DTBench | 93.3% | 91.2% |
| LMCA | 55% | 52.7% |
| Surface Evolver Bench | 83.8% | 95% |
| Epoch Capabilities Index | 159.62 | 157.45 |
| Kagi LLM Benchmark | 51.3% | — |
| ForecastBench | — | 61.1 |

## Math

- GPT-5.6 Terra: 81.6 (#12)
- Kimi K3: 74.2 (#16)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 86% | 72.2% |
| FrontierMath Tier 4 | 70.7% | 39% |
| OTIS Mock AIME 2024-2025 | 99.7% | 97.2% |
| ProofBench | 74% | 87% |
| LMArena Math | 1466 | 1491 |
| MathArena Final-Answer Competitions | — | 87.8% |

## Knowledge

- GPT-5.6 Terra: 61.2 (#30)
- Kimi K3: 63.2 (#21)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| GPQA Diamond | 93.3% | 93.1% |
| SimpleQA Verified | 43.2% | 50.6% |
| LMArena Expert | 1492 | 1521 |

## Multimodal

- GPT-5.6 Terra: 47.3 (#11)
- Kimi K3: 37.8 (#70)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| Blueprint-Bench 2 | 30.8% | 29.5% |
| Furniture Assembly | 54.2% | 34.2% |
| LMArena Vision | 1271 | — |
| LMArena Document | 1472 | — |

## Multilingual

- GPT-5.6 Terra: 54.4 (#44)
- Kimi K3: 56.3 (#21)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| LMArena Non-English | 1439 | 1466 |
| LMArena Chinese | 1513 | 1529 |
| LMArena French | 1471 | 1491 |
| LMArena German | 1460 | 1488 |
| LMArena Japanese | 1457 | 1487 |
| LMArena Korean | 1425 | 1458 |
| LMArena Russian | 1450 | 1482 |
| LMArena Spanish | 1448 | 1472 |

## Instruction Following

- GPT-5.6 Terra: 76.4 (#40)
- Kimi K3: 77.7 (#14)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| LMArena Instruction Following | 1454 | 1483 |

## Long Context

- GPT-5.6 Terra: 44.4 (#68)
- Kimi K3: 45.8 (#29)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| LMArena Longer Query | 1451 | 1494 |

## Writing & Preference

- GPT-5.6 Terra: 70.2 (#23)
- Kimi K3: 76.6 (#4)

| Benchmark | GPT-5.6 Terra | Kimi K3 |
|---|---|---|
| LMArena Text | 1447 | 1476 |
| LMArena Creative Writing | 1410 | 1454 |
| EQ-Bench Creative Writing | 1855 | 2082 |
| EQ-Bench 4 | 1234 | 1339 |
| LMArena Multi-Turn | 1449 | 1488 |

## FAQ

### Is GPT-5.6 Terra better than Kimi K3?

GPT-5.6 Terra and Kimi K3 score almost the same on the Noometry Index (59.2 vs 59.5), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.6 Terra or Kimi K3?

GPT-5.6 Terra is cheaper. It lists at $2 per million input tokens and $12 per million output tokens; Kimi K3 lists at $3 and $15.

### Is GPT-5.6 Terra or Kimi K3 better for coding?

Kimi K3 scores higher on coding benchmarks: 61.0 versus 57.7 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.6 Terra does, with 1.05M tokens against 1.05M.

### How many benchmarks do GPT-5.6 Terra and Kimi K3 share?

47 benchmarks have published results for both models. GPT-5.6 Terra has 52 scored results on Noometry and Kimi K3 has 53.