Claude Opus 4.5 vs Kimi K3
Claude Opus 4.5 
Kimi K3 Verdict
- Kimi K3 leads on quality: 66.5 vs 60.7.
- Claude Opus 4.5 (thinking) is stronger in agents & tools, instruction following, reasoning.
- Kimi K3 is stronger in coding, composite, knowledge, long context, maths, multimodal, human preference.
- Kimi K3 is 1.7× cheaper ($6.00 vs $10.00 per 1M blended).
| Metric | Claude Opus 4.5 (thinking) | Kimi K3 |
|---|---|---|
| BenchLeader Index | 60.7 | 66.5 |
| Agents & tools score | 74.6 | 67.4 |
| Coding score | 56.4 | 65.0 |
| Composite score | 65.8 | 74.2 |
| Instruction following score | 54.8 | – |
| Knowledge score | 61.0 | 68.2 |
| Long context score | 65.2 | 71.1 |
| Maths score | 64.0 | 78.1 |
| Multimodal score | 58.0 | 65.0 |
| Reasoning score | 58.6 | – |
| Human preference score | – | 71.2 |
| Blended price $/M | $10.00 | $6.00 |
| Output speed | 45 tok/s | 38 tok/s |
| Time to first answer | 17.3 s | 56.3 s |
| Context window | 200k | 1.0M |
| SciCode | – | 58.7% |
| APEX-Agents | – | 39.3% |
| FrontierCode | – | 44.2% |
| ProofBench | – | 87.0% |
| Epoch Capabilities Index | – | 157.6 |
| LiveBench | – | 79.2% |
| LiveBench Reasoning | – | 90.7% |
| LiveBench Coding | – | 81.5% |
| LiveBench Agentic Coding | – | 62.2% |
| LiveBench Mathematics | – | 84.4% |
| LiveBench Data Analysis | – | 78.7% |
| LiveBench Language | – | 85.5% |
| AA Intelligence Index | 29.1 | 43.8 |
| IFBench | 58.0% | – |
| AA-LCR | 77.3% | 88.7% |
| MMMU-Pro | 74.0% | 80.5% |
| AA-Omniscience | 14 | 19.7 |
| Terminal-Bench Hard | 47.0% | – |
| GPQA Diamond (AA) | 86.6% | 93.5% |
| Humanity's Last Exam (AA) | 30.1% | 46.9% |
| SciCode (AA) | – | 59.5% |
| τ²-Bench Telecom (AA) | 89.5% | – |
| AIME (Vals) | 95.4% | – |
| LiveCodeBench | 83.7% | – |
| MMLU-Pro | 87.3% | – |
| IOI | 20.3% | – |
| LegalBench | 84.6% | 86.0% |
| CorpFin | 65.1% | 71.6% |
| TaxEval | 74.9% | 75.7% |
| MedQA | 95.9% | – |
| MGSM | 95.2% | – |
| Terminal-Bench 2.1 (Vals) | – | 80.9% |
| SWE-bench (Vals) | 76.4% | 93.4% |
| GPQA Diamond (Vals) | 85.9% | 92.9% |
| Vals Index | – | 57.8 |
| MultiChallenge | 59.0% | – |
| PRBench Finance | 46.2% | – |
| PRBench Legal | 44.2% | – |
| VISTA | 46.4% | – |
| MultiNRC | 48.6% | – |
| TutorBench | 51.2% | – |
| EQ-Bench 4 | – | 1339 |
| Kagi LLM Benchmark | 80.2% | – |
| ARC-AGI-1 | 80.0% | – |
| ARC-AGI-2 | 37.6% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 4.5 vs Kimi K3: questions
- Is Claude Opus 4.5 better than Kimi K3?
- Kimi K3 leads on quality: 66.5 vs 60.7. The BenchLeader Index combines every independent quality benchmark; Kimi K3 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Claude Opus 4.5 better than Kimi K3 for coding?
- Kimi K3 scores higher in coding (65 vs 56 on the category index, where 50 is average).
- Is Claude Opus 4.5 better than Kimi K3 for agentic tasks?
- Claude Opus 4.5 scores higher in agentic tasks (75 vs 67 on the category index, where 50 is average).
- Which is cheaper, Claude Opus 4.5 or Kimi K3?
- Kimi K3 is cheaper: $6.00 against $10.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 4.5 or Kimi K3?
- Claude Opus 4.5 streams faster: 45 against 38 output tokens per second.
- Which has the larger context window?
- Kimi K3 accepts more context: 1.0M against 200k tokens.