Model comparison
Kimi K2.5 (Reasoning) vs Nemotron 3 Ultra
Head-to-head evidence from 22 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Verified leaderboard positions: Kimi K2.5 (Reasoning) unranked; Nemotron 3 Ultra #24
BenchAlign evidence: Kimi K2.5 (Reasoning) estimated; Nemotron 3 Ultra not scored. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Kimi K2.5 (Reasoning) and Nemotron 3 Ultra share 22 comparable benchmark results. 3 of 8 categories are comparable. 6 results are unique to Kimi K2.5 (Reasoning); 17 to Nemotron 3 Ultra.
Updated July 16, 2026- Shared results
- 22
- Kimi K2.5 (Reasoning) only
- 6
- Nemotron 3 Ultra only
- 17
- Comparable categories
- 3 / 8
Pick Kimi K2.5 (Reasoning) if you want the stronger benchmark profile. Nemotron 3 Ultra only becomes the better choice if you want the cheaper token bill or you need the larger 1M context window.
Confidence note. This is a partial-evidence comparison with 22 shared benchmark results across 6 evidence categories; 3 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Kimi K2.5 (Reasoning) is clearly ahead on the provisional aggregate, 70 to 60. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Kimi K2.5 (Reasoning)'s sharpest advantage is in knowledge, where it averages 87.2 against 54.2. The single biggest benchmark swing on the page is BrowseComp, 60.6% to 44.4%.
Kimi K2.5 (Reasoning) is also the more expensive model on tokens at $0.60 input / $3.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Nemotron 3 Ultra. That is roughly Infinityx on output cost alone. Nemotron 3 Ultra gives you the larger context window at 1M, compared with 128K for Kimi K2.5 (Reasoning).
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Kimi K2.5 (Reasoning) | Δ | Nemotron 3 Ultra |
|---|---|---|---|
| Knowledge | Kimi K2.5 (Reasoning)87.2 | Margin← 33.0 | Nemotron 3 Ultra54.2 |
| Coding | Kimi K2.5 (Reasoning)76.8 | Margin← 18.5 | Nemotron 3 Ultra58.3 |
| Agentic | Kimi K2.5 (Reasoning)55.0 | Margin← 3.7 | Nemotron 3 Ultra51.3 |
| Reasoning | Kimi K2.5 (Reasoning)Not measured | MarginNo overlap | Nemotron 3 Ultra61.9 |
| Multilingual | Kimi K2.5 (Reasoning)Not measured | MarginNo overlap | Nemotron 3 Ultra83.0 |
| Multimodal | Kimi K2.5 (Reasoning)78.5 | MarginNo overlap | Nemotron 3 UltraNot measured |
| Inst. Following | Kimi K2.5 (Reasoning)Not measured | MarginNo overlap | Nemotron 3 Ultra81.7 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
BrowseComp
AgenticA 60.6%B 44.4%Winner: Kimi K2.5 (Reasoning)Δ 16.2BrowseComp: Kimi K2.5 (Reasoning) scored 60.6%; Nemotron 3 Ultra scored 44.4%. Kimi K2.5 (Reasoning) wins this benchmark. - Source ↗
Terminal-Bench 2.0
AgenticA 50.8%B 56.4%Winner: Nemotron 3 UltraΔ 5.6Terminal-Bench 2.0: Kimi K2.5 (Reasoning) scored 50.8%; Nemotron 3 Ultra scored 56.4%. Nemotron 3 Ultra wins this benchmark. - Source ↗
SWE-bench Verified
CodingA 76.8%B 71.9%Winner: Kimi K2.5 (Reasoning)Δ 4.9SWE-bench Verified: Kimi K2.5 (Reasoning) scored 76.8%; Nemotron 3 Ultra scored 71.9%. Kimi K2.5 (Reasoning) wins this benchmark. - Source ↗
GPQA
KnowledgeA 87.6%B 87%Winner: Kimi K2.5 (Reasoning)Δ 0.6GPQA: Kimi K2.5 (Reasoning) scored 87.6%; Nemotron 3 Ultra scored 87%. Kimi K2.5 (Reasoning) wins this benchmark. - Source ↗
MMLU-Pro
KnowledgeA 87.1%B 86.8%Winner: Kimi K2.5 (Reasoning)Δ 0.3MMLU-Pro: Kimi K2.5 (Reasoning) scored 87.1%; Nemotron 3 Ultra scored 86.8%. Kimi K2.5 (Reasoning) wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Kimi K2.5 (Reasoning) | Nemotron 3 Ultra | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Kimi K2.5 (Reasoning)$0.6 input / $3 output | Nemotron 3 Ultra$0 input / $0 output | Nemotron 3 Ultra has the lower combined listed price. |
| Generation speedtokens per second | Kimi K2.5 (Reasoning)Not available | Nemotron 3 UltraNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Kimi K2.5 (Reasoning)Not available | Nemotron 3 UltraNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Kimi K2.5 (Reasoning)128K | Nemotron 3 Ultra1M | Nemotron 3 Ultra lists the larger context window. |
Benchmark Deep Dive
AgenticKimi K2.5 (Reasoning) wins14 benchmarks
| Benchmark | Kimi K2.5 (Reasoning) | Nemotron 3 Ultra | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 50.8% | 56.4% | Nemotron 3 Ultra leads |
| BrowseCompSource | 60.6% | 44.4% | Kimi K2.5 (Reasoning) leads |
| APEX-Agents-AASource | 11.5% | — | Not comparable |
| τ²-bench resultsSource | 95.9% | 83.3% | Kimi K2.5 (Reasoning) leads |
| Gert LabsSource | 32.58% | — | Not comparable |
| AA Agentic IndexSource | 21.7% | 27.4% | Nemotron 3 Ultra leads |
| GDPval-AASource | 25.4% | 33.2% | Nemotron 3 Ultra leads |
| GDPval-AASource | 1009 | 1164 | Nemotron 3 Ultra leads |
| PinchBenchSource | — | 90.0% | Not comparable |
| τ³-bench resultsSource | — | 70.9% | Not comparable |
| HLE w/ toolsSource | — | 37.4% | Not comparable |
| AA BriefcaseSource | — | 870 | Not comparable |
| AA EnterpriseOps-GymSource | — | 28.9% | Not comparable |
| AA Harvey LABSource | — | 3.3% | Not comparable |
CodingKimi K2.5 (Reasoning) wins9 benchmarks
| Benchmark | Kimi K2.5 (Reasoning) | Nemotron 3 Ultra | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 76.8% | 71.9% | Kimi K2.5 (Reasoning) leads |
| Vibe Code BenchSource | 17.54% | — | Not comparable |
| Terminal-Bench HardSource | 34.8% | 36.4% | Nemotron 3 Ultra leads |
| AA-SciCodeSource | 49.0% | 39.9% | Kimi K2.5 (Reasoning) leads |
| AA Coding IndexSource | 46.8% | 49.3% | Nemotron 3 Ultra leads |
| SWE MultilingualSource | — | 67.7% | Not comparable |
| LiveCodeBench v6Source | — | 89.0% | Not comparable |
| SciCodeSource | — | 44.6% | Not comparable |
| Terminal-Bench 2.0Source | — | 56.4% | Not comparable |
Reasoning3 benchmarks
KnowledgeKimi K2.5 (Reasoning) wins12 benchmarks
| Benchmark | Kimi K2.5 (Reasoning) | Nemotron 3 Ultra | Result |
|---|---|---|---|
| GPQASource | 87.6% | 87% | Kimi K2.5 (Reasoning) leads |
| MMLU-ProSource | 87.1% | 86.8% | Kimi K2.5 (Reasoning) leads |
| Artificial Analysis Intelligence IndexSource | 35.4% | 37.8% | Nemotron 3 Ultra leads |
| AA-GPQA DiamondSource | 87.9% | 86.7% | Kimi K2.5 (Reasoning) leads |
| AA-HLESource | 29.4% | 26.6% | Kimi K2.5 (Reasoning) leads |
| AA-Omniscience IndexSource | -8.1% | -0.8% | Nemotron 3 Ultra leads |
| AA-Omniscience AccuracySource | 34.3% | 21.6% | Kimi K2.5 (Reasoning) leads |
| AA-Omniscience Hallucination RateSource | 64.6% | 28.5% | Nemotron 3 Ultra leads |
| GPQA-DSource | — | 87.0% | Not comparable |
| HLESource | — | 26.7% | Not comparable |
| HLE w/o toolsSource | — | 26.7% | Not comparable |
| AA Openness IndexSource | — | 83.3% | Not comparable |
Math1 benchmarks
| Benchmark | Kimi K2.5 (Reasoning) | Nemotron 3 Ultra | Result |
|---|---|---|---|
| AIME 2025Source | 96.1% | — | Not comparable |
Multilingual1 benchmarks
| Benchmark | Kimi K2.5 (Reasoning) | Nemotron 3 Ultra | Result |
|---|---|---|---|
| MMLU-ProXSource | — | 83% | Not comparable |
Multimodal3 benchmarks
Frequently Asked Questions (4)
Which is better, Kimi K2.5 (Reasoning) or Nemotron 3 Ultra?
Kimi K2.5 (Reasoning) is ahead on BenchLM's provisional leaderboard, 70 to 60. The biggest single separator in this matchup is BrowseComp, where the scores are 60.6% and 44.4%.
Which is better for knowledge tasks, Kimi K2.5 (Reasoning) or Nemotron 3 Ultra?
Kimi K2.5 (Reasoning) has the edge for knowledge tasks in this comparison, averaging 87.2 versus 54.2. Inside this category, AA-Omniscience Hallucination Rate is the benchmark that creates the most daylight between them.
Which is better for coding, Kimi K2.5 (Reasoning) or Nemotron 3 Ultra?
Kimi K2.5 (Reasoning) has the edge for coding in this comparison, averaging 76.8 versus 58.3. Inside this category, AA-SciCode is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Kimi K2.5 (Reasoning) or Nemotron 3 Ultra?
Kimi K2.5 (Reasoning) has the edge for agentic tasks in this comparison, averaging 55 versus 51.3. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
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