Model comparison
Claude 2.1 vs Kimi K2.5
Kimi K2.5 is the stronger model overall, scoring 48.1 to 25.2 on the Noometry Index.
Last verified . 4 shared benchmarks.
Summary
- They share 4 benchmarks with published results for both. Claude 2.1 scores higher in 0 categories and Kimi K2.5 in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2.5 leads 51.8 to 10.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 1.9% for Claude 2.1 and 92.2% for Kimi K2.5.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| Claude 2.1 | Kimi K2.5 | |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Noometry Index | 25.2 | 48.1 |
| Released | 2023-11-21 | 2026-01-27 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 262K |
| Input $ / M tokens | — | $0.45 |
| Output $ / M tokens | — | $2.25 |
| Results tracked | 7 | 51 |
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Category by category
Coding Kimi K2.5 leads
Claude 2.1: 26.2 (#327), Kimi K2.5: 48.8 (#53)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| WeirdML | 7.1% | 45.6% |
| SWE-bench Verified | — | 73.8% |
| SWE-bench Verified (bash only) | — | 70.8% |
| LMArena WebDev | — | 1437 |
| SWE-bench Multilingual | — | 67.3% |
| SciCode | — | 49% |
| LMArena Coding | — | 1474 |
| ALE-Bench | — | 821.65 |
Agentic & Tool Use Not comparable
Claude 2.1: —, Kimi K2.5: 34.2 (#48)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| Terminal-Bench | — | 43.2% |
| OSWorld | — | 63.3% |
| Vending-Bench 2 | — | 1,198 |
Reasoning Kimi K2.5 leads
Claude 2.1: 21.4 (#221), Kimi K2.5: 31.2 (#80)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| Epoch Capabilities Index | 119.27 | 148.03 |
| ARC-AGI-2 | — | 11.8% |
| SimpleBench | — | 46.8% |
| Kagi LLM Benchmark | — | 78.5% |
| NYT Connections (extended) | — | 69.9% |
| ARC-AGI-1 | — | 65.3% |
| CritPt | — | 3.1% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 3.4% |
| Thematic Generalization | — | 69.4% |
| LMArena Hard Prompts | — | 1453 |
| DTBench | 51% | — |
| ForecastBench | 54.2 | — |
Math Kimi K2.5 leads
Claude 2.1: 10.2 (#315), Kimi K2.5: 51.8 (#53)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.9% | 92.2% |
| MathArena Final-Answer Competitions | — | 62.3% |
| LMArena Math | — | 1470 |
| FrontierMath (Feb 2025 set) | — | 27.9% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Kimi K2.5 leads
Claude 2.1: 15.4 (#292), Kimi K2.5: 53.6 (#56)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| GPQA Diamond | 33% | 87.6% |
| Humanity's Last Exam | — | 24.4% |
| SimpleQA Verified | — | 34.3% |
| Vectara Hallucination Rate | — | 14.2% |
| LMArena Expert | — | 1466 |
| MMLU | 73.5% | — |
Multimodal Not comparable
Claude 2.1: —, Kimi K2.5: 41.1 (#39)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| LMArena Vision | — | 1269 |
| LMArena Document | — | 1430 |
Multilingual Not comparable
Claude 2.1: —, Kimi K2.5: 53.9 (#53)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| LMArena Non-English | — | 1433 |
| LMArena Chinese | — | 1495 |
| LMArena French | — | 1454 |
| LMArena German | — | 1441 |
| LMArena Japanese | — | 1421 |
| LMArena Korean | — | 1410 |
| LMArena Russian | — | 1435 |
| LMArena Spanish | — | 1450 |
Instruction Following Not comparable
Claude 2.1: —, Kimi K2.5: 75.3 (#64)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| LMArena Instruction Following | — | 1431 |
Long Context Not comparable
Claude 2.1: —, Kimi K2.5: 52.1 (#7)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| Fiction.LiveBench | — | 86.1% |
| CL-bench | — | 19.3% |
| CL-bench Life | — | 13.2% |
| LMArena Longer Query | — | 1445 |
Writing & Preference Not comparable
Claude 2.1: —, Kimi K2.5: 65.1 (#53)
| Benchmark | Claude 2.1 | Kimi K2.5 |
|---|---|---|
| LMArena Text | — | 1445 |
| LMArena Creative Writing | — | 1423 |
| EQ-Bench Creative Writing | — | 1579 |
| LMArena Multi-Turn | — | 1444 |
Frequently asked questions
Is Claude 2.1 better than Kimi K2.5?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 25.2 on the Noometry Index.
Is Claude 2.1 or Kimi K2.5 better for coding?
Kimi K2.5 scores higher on coding benchmarks: 48.8 versus 26.2 in the Noometry coding category.
How many benchmarks do Claude 2.1 and Kimi K2.5 share?
4 benchmarks have published results for both models. Claude 2.1 has 7 scored results on Noometry and Kimi K2.5 has 51.