AI model comparison
Nemotron 3 Ultra vs Kimi K2.5
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
NVIDIA
Nemotron 3 Ultra
NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE).
- Input / 1M
- $0.50
- Output / 1M
- $2.20
- Context
- 262K
Moonshot AI
Kimi K2.5
Kimi K2.5 is Moonshot AI's native multimodal model, delivering state-of-the-art visual coding capability and a self-directed agent swarm paradigm.
- Input / 1M
- $0.45
- Output / 1M
- $2.25
- Context
- 262K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Kimi K2.5
1.0x cheaper for a typical chat
Higher intelligence score
Kimi K2.5
23.5 vs 22.9 on Artificial Analysis
Larger context window
Tie
262K vs 262K tokens
Newer release
Nemotron 3 Ultra
Released June 4, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Coding index
Agentic index
Pricing
Nemotron 3 Ultra vs Kimi K2.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | ||
|---|---|---|
| Input tokensPer 1M tokens | $0.50 | $0.45 |
| Output tokensPer 1M tokens | $2.20 | $2.25 |
| Cached input (read)Per 1M tokens | $0.10 | $0.07 |
| Cache writePer 1M tokens | Not available | Not available |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Coding task
30K in, 4K out
Long document summary
150K in, 2K out
Specs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | ||
|---|---|---|
| Context window | 262K tokens | 262K tokens |
| Max output | 16K tokens | 236K tokens |
| Input types | Text | Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium | Not available |
| Default reasoning effort | High | Not available |
| Release date | June 4, 2026 | January 27, 2026 |
Features
Supported features
API features available for each model.
| Metric | ||
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- Nemotron 3 Ultra vs DeepSeek V4 Flash 0423
- Nemotron 3 Ultra vs Gemini 3 Flash Preview
- Nemotron 3 Ultra vs Grok 4.3
- Nemotron 3 Ultra vs GPT-5.4 Mini
- Nemotron 3 Ultra vs Qwen3.5-27B
- Nemotron 3 Ultra vs MiniMax M2.5
- Nemotron 3 Ultra vs Gemini 3.5 Flash Lite
- Nemotron 3 Ultra vs GLM 4.7
- Nemotron 3 Ultra vs Kimi K2 Thinking
- Nemotron 3 Ultra vs Qwen3.6 27B
- Nemotron 3 Ultra vs GPT-5 Mini
- Nemotron 3 Ultra vs GPT-5.1-Codex-Mini
Our take
Kimi K2.5 is 1.0x cheaper for a typical chat. Kimi K2.5 scores higher on the Artificial Analysis Intelligence Index (23.5 vs 22.9). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Nemotron 3 Ultra or Kimi K2.5 cheaper?
Kimi K2.5 is cheaper for a typical chat (2K input tokens and 500 output tokens). Kimi K2.5 costs $0.45 per 1M input tokens and $2.25 per 1M output tokens, while Nemotron 3 Ultra costs $0.50 per 1M input tokens and $2.20 per 1M output tokens.
Which has a bigger context window, Nemotron 3 Ultra or Kimi K2.5?
Nemotron 3 Ultra supports up to 262K tokens of context, compared with 262K for Kimi K2.5.
Is Nemotron 3 Ultra smarter than Kimi K2.5?
On the Artificial Analysis Intelligence Index, Nemotron 3 Ultra scores 22.9 and Kimi K2.5 scores 23.5, putting Kimi K2.5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Nemotron 3 Ultra and Kimi K2.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Nemotron 3 Ultra and Kimi K2.5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Nemotron 3 Ultra and Kimi K2.5 at the same time. Compare the answers side by side and keep the best one.