Model comparison
Kimi K2.5 vs Nova Premier 1.0
Kimi K2.5 is the stronger model overall, scoring 48.1 to 38.3 on the Noometry Index.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. Kimi K2.5 scores higher in 5 categories and Nova Premier 1.0 in 0 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2.5 leads 51.8 to 33.8.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 78.5% for Kimi K2.5 and 44.8% for Nova Premier 1.0.
- Kimi K2.5 is cheaper at $0.45 / $2.25 per million input/output tokens, against $2.50 / $12.50 for Nova Premier 1.0.
- Nova Premier 1.0 accepts more context: 1M tokens versus 262K.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 | Nova Premier 1.0 | |
|---|---|---|
| Provider | Moonshot AI | Amazon |
| Noometry Index | 48.1 | 38.3 |
| Released | 2026-01-27 | 2025-04-30 |
| Weights | Open | Proprietary |
| Context window | 262K | 1M |
| Max output | 262K | 10K |
| Input $ / M tokens | $0.45 | $2.50 |
| Output $ / M tokens | $2.25 | $12.50 |
| Results tracked | 51 | 6 |
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Category by category
Coding Not comparable
Kimi K2.5: 48.8 (#53), Nova Premier 1.0: —
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| 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% | — |
| LMArena Coding | 1474 | — |
| ALE-Bench | 821.65 | — |
Agentic & Tool Use Not comparable
Kimi K2.5: 34.2 (#48), Nova Premier 1.0: —
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| Terminal-Bench | 43.2% | — |
| OSWorld | 63.3% | — |
| Vending-Bench 2 | 1,198 | — |
Reasoning Kimi K2.5 leads
Kimi K2.5: 31.2 (#80), Nova Premier 1.0: 23.0 (#185)
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| Kagi LLM Benchmark | 78.5% | 44.8% |
| ARC-AGI-2 | 11.8% | — |
| SimpleBench | 46.8% | — |
| 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 | — |
| Epoch Capabilities Index | 148.03 | — |
Math Kimi K2.5 leads
Kimi K2.5: 51.8 (#53), Nova Premier 1.0: 33.8 (#199)
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| MathArena Final-Answer Competitions | 62.3% | — |
| OTIS Mock AIME 2024-2025 | 92.2% | — |
| Omni-MATH | — | 35% |
| LMArena Math | 1470 | — |
| FrontierMath (Feb 2025 set) | 27.9% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Kimi K2.5 leads
Kimi K2.5: 53.6 (#56), Nova Premier 1.0: 35.8 (#180)
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| GPQA Diamond | 87.6% | — |
| Humanity's Last Exam | 24.4% | — |
| SimpleQA Verified | 34.3% | — |
| MMLU-Pro | — | 72.6% |
| Vectara Hallucination Rate | 14.2% | — |
| GPQA (HELM) | — | 51.8% |
| LMArena Expert | 1466 | — |
Multimodal Not comparable
Kimi K2.5: 41.1 (#39), Nova Premier 1.0: —
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| LMArena Vision | 1269 | — |
| LMArena Document | 1430 | — |
Multilingual Not comparable
Kimi K2.5: 53.9 (#53), Nova Premier 1.0: —
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| 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), Nova Premier 1.0: 66.8 (#204)
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| IFEval | — | 80.3% |
| LMArena Instruction Following | 1431 | — |
Long Context Not comparable
Kimi K2.5: 52.1 (#7), Nova Premier 1.0: —
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| 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), Nova Premier 1.0: 51.0 (#178)
| Benchmark | Kimi K2.5 | Nova Premier 1.0 |
|---|---|---|
| LMArena Text | 1445 | — |
| LMArena Creative Writing | 1423 | — |
| EQ-Bench Creative Writing | 1579 | — |
| WildBench | — | 78.8% |
| LMArena Multi-Turn | 1444 | — |
Frequently asked questions
Is Kimi K2.5 better than Nova Premier 1.0?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 38.3 on the Noometry Index.
Which is cheaper, Kimi K2.5 or Nova Premier 1.0?
Kimi K2.5 is cheaper. It lists at $0.45 per million input tokens and $2.25 per million output tokens; Nova Premier 1.0 lists at $2.50 and $12.50.
Which has the bigger context window?
Nova Premier 1.0 does, with 1M tokens against 262K.
How many benchmarks do Kimi K2.5 and Nova Premier 1.0 share?
1 benchmark has published results for both models. Kimi K2.5 has 51 scored results on Noometry and Nova Premier 1.0 has 6.