DeepSeek: DeepSeek V4 Flash 0731 vs NVIDIA: Nemotron 3.5 Lightning (free)
Based on weekly OpenRouter usage tracked by AI Tier List, DeepSeek: DeepSeek V4 Flash 0731 ranks #1 overall — ahead of NVIDIA: Nemotron 3.5 Lightning (free) at #34. NVIDIA: Nemotron 3.5 Lightning (free) is cheaper on input tokens at Free/1M vs $0.14/1M for DeepSeek: DeepSeek V4 Flash 0731. DeepSeek: DeepSeek V4 Flash 0731 offers the larger context window at 1M tokens.
DeepSeek: DeepSeek V4 Flash 0731 vs NVIDIA: Nemotron 3.5 Lightning (free): which should you use?
Choose DeepSeek: DeepSeek V4 Flash 0731 if…
- It sees more real traffic — #1 overall on OpenRouter's weekly ranking, against #34 for NVIDIA: Nemotron 3.5 Lightning (free).
- Bigger context window — 1M vs 1M tokens.
Choose NVIDIA: Nemotron 3.5 Lightning (free) if…
- Cheaper to read — Free vs $0.14 per 1M input tokens, which is what dominates long-prompt and RAG workloads.
- Cheaper to write — Free vs $0.28 per 1M output tokens, the line item that decides generation-heavy costs.
- It is the newer model — released Aug 2026 against Jul 2026.
Spec Comparison
| Spec | DeepSeek: DeepSeek V4 Flash 0731 | NVIDIA: Nemotron 3.5 Lightning (free) |
|---|---|---|
| Author | deepseek | nvidia |
| Input price (per 1M tokens) | $0.14 | Free |
| Output price (per 1M tokens) | $0.28 | Free |
| Context window | 1M | 1M |
| Input modalities | text | text |
| Output modalities | text | text |
| AA Intelligence | 51.8 | — |
| AA Coding | 69.1 | — |
| AA Agentic | 48.4 | — |
| Released | Jul 2026 | Aug 2026 |
What DeepSeek: DeepSeek V4 Flash 0731 and NVIDIA: Nemotron 3.5 Lightning (free) actually cost to run
On a read-heavy job — 1M tokens in, 100K out — DeepSeek: DeepSeek V4 Flash 0731 costs $0.17 and NVIDIA: Nemotron 3.5 Lightning (free) costs $0.00.
Flip the shape — 100K in, 1M out — and it becomes $0.29 for DeepSeek: DeepSeek V4 Flash 0731 versus $0.00 for NVIDIA: Nemotron 3.5 Lightning (free).
Both figures are the published per-token rates multiplied out; caching and batch discounts are not included.
Usage Rank by Task
| Task | DeepSeek: DeepSeek V4 Flash 0731 | NVIDIA: Nemotron 3.5 Lightning (free) |
|---|---|---|
| Overall | #1 | #34 |
| Memory Extraction | #6 | — |
| Multi-step Planning | #2 | — |
| Tool Dispatch | #2 | — |
| Web Search | #4 | — |
| Agent Workflows | #5 | — |
| Classification & Tagging | #9 | — |
| Debugging | #3 | — |
| DevOps Config | #2 | — |
| File Read/Write | #3 | — |
| Frontend UI | #2 | — |
| Code Implementation | #3 | — |
| Repo Analysis | #3 | — |
| Code Review & Security | #3 | — |
| Shell Execution | #6 | — |
About DeepSeek: DeepSeek V4 Flash 0731 and NVIDIA: Nemotron 3.5 Lightning (free)
DeepSeek: DeepSeek V4 Flash 0731
Built by deepseek · released Jul 2026 · 1M-token context
DeepSeek V4 Flash 0731 is a sparse mixture-of-experts model from DeepSeek, with 13B active parameters out of 284B total. This re-post-trained revision is suited for coding, reasoning, and agent workflows....
NVIDIA: Nemotron 3.5 Lightning (free)
Built by nvidia · released Aug 2026 · 1M-token context
NVIDIA Nemotron 3.5 Lightning is an open mixture-of-experts model from NVIDIA, with 3B active parameters out of 30B total. It is suited for high-throughput agentic workloads and specialized tasks that...
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- DeepSeek: DeepSeek V4 Flash 0731 vs DeepSeek: DeepSeek V4 Flash 0423
- NVIDIA: Nemotron 3.5 Lightning (free) vs Tencent: Hy3
- NVIDIA: Nemotron 3.5 Lightning (free) vs OpenAI: GPT-5.6 Luna (batch)
- NVIDIA: Nemotron 3.5 Lightning (free) vs DeepSeek: DeepSeek V4 Flash 0423
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FAQ
Which is better, DeepSeek: DeepSeek V4 Flash 0731 or NVIDIA: Nemotron 3.5 Lightning (free)?
Based on weekly OpenRouter usage tracked by AI Tier List, DeepSeek: DeepSeek V4 Flash 0731 ranks #1 overall — ahead of NVIDIA: Nemotron 3.5 Lightning (free) at #34. NVIDIA: Nemotron 3.5 Lightning (free) is cheaper on input tokens at Free/1M vs $0.14/1M for DeepSeek: DeepSeek V4 Flash 0731. DeepSeek: DeepSeek V4 Flash 0731 offers the larger context window at 1M tokens.
Which is cheaper, DeepSeek: DeepSeek V4 Flash 0731 or NVIDIA: Nemotron 3.5 Lightning (free)?
NVIDIA: Nemotron 3.5 Lightning (free) is cheaper at Free per 1M input tokens. Output pricing: DeepSeek: DeepSeek V4 Flash 0731 $0.28, NVIDIA: Nemotron 3.5 Lightning (free) Free.
Is DeepSeek: DeepSeek V4 Flash 0731 still ahead of NVIDIA: Nemotron 3.5 Lightning (free) right now?
Yes. For the week of 2026-08-10, DeepSeek: DeepSeek V4 Flash 0731 ranks #1 overall on OpenRouter usage against #34 for NVIDIA: Nemotron 3.5 Lightning (free). Ranks refresh weekly, and the verdict on this page flips if they cross.
Usage ranks are weekly data aggregated by OpenRouter. Prices are USD per 1M tokens.