GPT-5.6 Terra vs Kimi K2.6
GPT-5.6 Terra 
Kimi K2.6 Verdict
- GPT-5.6 Terra (xhigh) leads on quality: 64.4 vs 60.7.
- GPT-5.6 Terra (xhigh) is stronger in agents & tools, coding, composite, human preference, knowledge, maths.
- Kimi K2.6 is stronger in instruction following, long context, multimodal, reasoning.
- Kimi K2.6 is 2.6× cheaper ($1.71 vs $4.50 per 1M blended).
- GPT-5.6 Terra (xhigh) streams 1.8× faster (79 vs 44 tokens per second).
| Metric | GPT-5.6 Terra (xhigh) | Kimi K2.6 |
|---|---|---|
| BenchLeader Index | 64.4 | 60.7 |
| Agents & tools score | 69.8 | 45.1 |
| Coding score | 63.7 | 60.4 |
| Composite score | 77.3 | 68.6 |
| Human preference score | 66.7 | 60.8 |
| Instruction following score | 65.3 | 73.7 |
| Knowledge score | 61.0 | 58.6 |
| Long context score | 66.0 | 67.1 |
| Maths score | 71.0 | 53.8 |
| Multimodal score | 63.0 | 63.7 |
| Reasoning score | 58.6 | 66.0 |
| Blended price $/M | $4.50 | $1.71 |
| Output speed | 79 tok/s | 44 tok/s |
| Time to first answer | 33.6 s | 103.2 s |
| Context window | 1M | 262k |
| GPQA Diamond | – | 90.8% |
| FrontierMath Tiers 1–3 | – | 57.2% |
| FrontierMath Tier 4 | – | 25.6% |
| OTIS Mock AIME | – | 96.1% |
| SWE-bench Verified (Epoch) | – | 76.7% |
| SimpleQA Verified | – | 34.9% |
| SimpleBench | 48.9% | – |
| OSWorld-Verified 2.0 | – | 4.6% |
| SciCode | 51.6% | 53.5% |
| WeirdML | – | 55.9% |
| APEX-Agents | – | 18.9% |
| ProofBench | 74.0% | 16.0% |
| Epoch Capabilities Index | – | 151.0 |
| LMArena Text | 1466 | 1461 |
| LMArena Hard Prompts | 1491 | 1485 |
| LMArena Coding | 1519 | 1514 |
| LMArena WebDev | 1521 | 1509 |
| LMArena Vision | 1269 | 1281 |
| LMArena Agent | 1.5 | – |
| AA Intelligence Index | 38.2 | 31.3 |
| IFBench | 66.3% | 76.0% |
| AA-LCR | 79.0% | 81.0% |
| MMMU-Pro | 79.5% | 79.4% |
| AA-Omniscience | -3.0 | 5.3 |
| Terminal-Bench Hard | 62.9% | 43.9% |
| GPQA Diamond (AA) | 90.8% | 91.1% |
| Humanity's Last Exam (AA) | 41.9% | 37.5% |
| SciCode (AA) | 52.3% | 51.5% |
| τ²-Bench Telecom (AA) | 80.4% | 95.9% |
| LiveCodeBench | 85.9% | 86.8% |
| MMLU-Pro | 86.7% | 87.6% |
| IOI | 65.3% | – |
| LegalBench | – | 84.7% |
| CorpFin | 65.3% | 66.7% |
| TaxEval | 76.2% | 74.7% |
| Terminal-Bench 2.1 (Vals) | – | 53.6% |
| SWE-bench (Vals) | – | 76.2% |
| GPQA Diamond (Vals) | 90.9% | 89.1% |
| Vals Index | – | 43.5 |
| HiL-Bench | – | 18.7% |
| EQ-Bench 4 | – | 1202 |
| ARC-AGI-1 | 94.0% | – |
| ARC-AGI-2 | 74.2% | – |
| ARC-AGI-3 | 0.7% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.6 Terra vs Kimi K2.6: questions
- Is GPT-5.6 Terra better than Kimi K2.6?
- GPT-5.6 Terra (xhigh) leads on quality: 64.4 vs 60.7. The BenchLeader Index combines every independent quality benchmark; GPT-5.6 Terra (xhigh) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-5.6 Terra better than Kimi K2.6 for coding?
- GPT-5.6 Terra scores higher in coding (64 vs 60 on the category index, where 50 is average).
- Is GPT-5.6 Terra better than Kimi K2.6 for agentic tasks?
- GPT-5.6 Terra scores higher in agentic tasks (70 vs 45 on the category index, where 50 is average).
- Which is cheaper, GPT-5.6 Terra or Kimi K2.6?
- Kimi K2.6 is cheaper: $1.71 against $4.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.6 Terra or Kimi K2.6?
- GPT-5.6 Terra streams faster: 79 against 44 output tokens per second.
- Which has the larger context window?
- GPT-5.6 Terra accepts more context: 1M against 262k tokens.