# Kimi K2 vs Nemotron Ultra 253B

> Side-by-side benchmark comparison for Kimi K2 and Nemotron Ultra 253B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/kimi-k2-vs-nemotron-ultra-253b
- Last updated: October 17, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Nemotron Ultra 253B leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Nemotron Ultra 253B has the higher overall point estimate 63 to 33.48. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in instruction following, where the averages are 48.4 for Kimi K2 and 0 for Nemotron Ultra 253B.
- The biggest single benchmark swing is AIME 2025 in Mathematics, with scores of 49.5% and 72.5%.
- Nemotron Ultra 253B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Kimi K2 also has the larger context window at 128K.

## Model Snapshot

| Property | Kimi K2 | Nemotron Ultra 253B |
|----------|----------|----------|
| Creator | Moonshot AI | NVIDIA |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 32K |
| Overall Score | 33.48 | null |
| Benchmarks Covered | 13 | 5 |
| Pricing (input/output) | $0.60 / $2.50 | $0.00 / $0.00 |

## Category Breakdown

### Coding

- Winner: Not comparable
- Kimi K2 public-lane score: Coming soon
- Nemotron Ultra 253B public-lane score: Coming soon

| Benchmark | Kimi K2 | Nemotron Ultra 253B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 65.8% | Coming soon | Coming soon |
| LiveCodeBench v6 | 53.7% | Coming soon | Coming soon |
| SWE Multilingual | 47.3% | Coming soon | Coming soon |
| LiveCodeBench | Coming soon | 66.3% | Coming soon |

### Reasoning

- Winner: Not comparable
- Kimi K2 public-lane score: 62.3 (Unranked · 2 rankable rows)
- Nemotron Ultra 253B public-lane score: Coming soon

### Knowledge

- Winner: Not comparable
- Kimi K2 public-lane score: 36.1 (Estimated · #129/184)
- Nemotron Ultra 253B public-lane score: Coming soon

| Benchmark | Kimi K2 | Nemotron Ultra 253B | Winner |
|-----------|-----------|-----------|--------|
| MMLU | 89.5% | Coming soon | Coming soon |
| GPQA | 75.1% | 76.0% | Nemotron Ultra 253B |
| SuperGPQA | 57.2% | Coming soon | Coming soon |
| MMLU-Pro | 81.1% | Coming soon | Coming soon |
| SimpleQA | 31% | Coming soon | Coming soon |
| HLE | 4.7% | Coming soon | Coming soon |

### Instruction Following

- Winner: Directional only
- Kimi K2 public-lane score: 48.4 (#96/148)
- Nemotron Ultra 253B public-lane score: 0 (#144/148)

| Benchmark | Kimi K2 | Nemotron Ultra 253B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 89.8% | 89.5% | Kimi K2 |

### Mathematics

- Winner: Not comparable
- Kimi K2 public-lane score: 0 (#12/12)
- Nemotron Ultra 253B public-lane score: Coming soon

| Benchmark | Kimi K2 | Nemotron Ultra 253B | Winner |
|-----------|-----------|-----------|--------|
| AIME 2024 | 69.6% | Coming soon | Coming soon |
| AIME 2025 | 49.5% | 72.5% | Nemotron Ultra 253B |
| MATH-500 | 97.4% | 97% | Kimi K2 |

## FAQ

### Which is better overall, Kimi K2 or Nemotron Ultra 253B?

Nemotron Ultra 253B has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Kimi K2 and Nemotron Ultra 253B?

The widest category gap is in instruction following, where the averages are 48.4 for Kimi K2 and 0 for Nemotron Ultra 253B.

### How many benchmarks does Kimi K2 cover on BenchLM?

Kimi K2 currently has 13 sourced benchmark scores on BenchLM.

### How many benchmarks does Nemotron Ultra 253B cover on BenchLM?

Nemotron Ultra 253B currently has 5 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Kimi K2 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-kimi-k2)
- [Nemotron Ultra 253B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-nemotron-ultra-253b)
- [Kimi K2 vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-kimi-k2)
- [Nemotron Ultra 253B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-nemotron-ultra-253b)

## Explore More

- [Kimi K2 profile](/models/kimi-k2)
- [Nemotron Ultra 253B profile](/models/nemotron-ultra-253b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)