Model comparison
Kimi K2.5 vs Sonar
Kimi K2.5 is the stronger model overall, scoring 48.1 to 38.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
PerplexitySummary
- The widest gap is in math, where Kimi K2.5 leads 51.8 to 33.7.
- Kimi K2.5 is cheaper at $0.45 / $2.25 per million input/output tokens, against $1 / $1 for Sonar.
- Kimi K2.5 accepts more context: 262K tokens versus 128K.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 | Sonar | |
|---|---|---|
| Provider | Moonshot AI | Perplexity |
| Noometry Index | 48.1 | 38.5 |
| Released | 2026-01-27 | 2024-01-01 |
| Weights | Open | Proprietary |
| Context window | 262K | 128K |
| Max output | 262K | 4K |
| Input $ / M tokens | $0.45 | $1 |
| Output $ / M tokens | $2.25 | $1 |
| Results tracked | 51 | 7 |
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Category by category
Coding Kimi K2.5 leads
Kimi K2.5: 48.8 (#53), Sonar: 35.7 (#221)
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| SWE-bench Verified | 73.8% | — |
| SWE-bench Verified (bash only) | 70.8% | — |
| LMArena WebDev | 1437 | — |
| SWE-bench Multilingual | 67.3% | — |
| SciCode | 49% | — |
| WeirdML | 45.6% | — |
| LiveBench Coding | — | 35.1% |
| LMArena Coding | 1474 | — |
| ALE-Bench | 821.65 | — |
Agentic & Tool Use Not comparable
Kimi K2.5: 34.2 (#48), Sonar: —
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| Terminal-Bench | 43.2% | — |
| OSWorld | 63.3% | — |
| Vending-Bench 2 | 1,198 | — |
Reasoning Kimi K2.5 leads
Kimi K2.5: 31.2 (#80), Sonar: 21.1 (#227)
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| 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% | — |
| LiveBench Reasoning | — | 46.3% |
| LMArena Hard Prompts | 1453 | — |
| LiveBench Data Analysis | — | 37.9% |
| Epoch Capabilities Index | 148.03 | — |
| LiveBench | — | 46.9% |
Math Kimi K2.5 leads
Kimi K2.5: 51.8 (#53), Sonar: 33.7 (#200)
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| MathArena Final-Answer Competitions | 62.3% | — |
| OTIS Mock AIME 2024-2025 | 92.2% | — |
| LiveBench Math | — | 41.6% |
| LMArena Math | 1470 | — |
| FrontierMath (Feb 2025 set) | 27.9% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Not comparable
Kimi K2.5: 53.6 (#56), Sonar: —
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| GPQA Diamond | 87.6% | — |
| Humanity's Last Exam | 24.4% | — |
| SimpleQA Verified | 34.3% | — |
| Vectara Hallucination Rate | 14.2% | — |
| LMArena Expert | 1466 | — |
Multimodal Not comparable
Kimi K2.5: 41.1 (#39), Sonar: —
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| LMArena Vision | 1269 | — |
| LMArena Document | 1430 | — |
Multilingual Not comparable
Kimi K2.5: 53.9 (#53), Sonar: —
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| 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 Kimi K2.5 leads
Kimi K2.5: 75.3 (#64), Sonar: 71.4 (#150)
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
| LMArena Instruction Following | 1431 | — |
Long Context Not comparable
Kimi K2.5: 52.1 (#7), Sonar: —
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| Fiction.LiveBench | 86.1% | — |
| CL-bench | 19.3% | — |
| CL-bench Life | 13.2% | — |
| LMArena Longer Query | 1445 | — |
Writing & Preference Kimi K2.5 leads
Kimi K2.5: 65.1 (#53), Sonar: 52.6 (#167)
| Benchmark | Kimi K2.5 | Sonar |
|---|---|---|
| LMArena Text | 1445 | — |
| LMArena Creative Writing | 1423 | — |
| EQ-Bench Creative Writing | 1579 | — |
| LMArena Multi-Turn | 1444 | — |
| LiveBench Language | — | 44.1% |
Frequently asked questions
Is Kimi K2.5 better than Sonar?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 38.5 on the Noometry Index.
Which is cheaper, Kimi K2.5 or Sonar?
Kimi K2.5 is cheaper. It lists at $0.45 per million input tokens and $2.25 per million output tokens; Sonar lists at $1 and $1.
Is Kimi K2.5 or Sonar better for coding?
Kimi K2.5 scores higher on coding benchmarks: 48.8 versus 35.7 in the Noometry coding category.
Which has the bigger context window?
Kimi K2.5 does, with 262K tokens against 128K.
How many benchmarks do Kimi K2.5 and Sonar share?
0 benchmarks have published results for both models. Kimi K2.5 has 51 scored results on Noometry and Sonar has 7.