NVIDIA Nemotron 3 Ultra
A very large chat model you can try free, with a daily limit. It's for people who write code. There's a free plan, and a paid plan if you need more.
Get patch notes
Same daily newsletter as the rest of the site. One email a day.
No affiliate link on file. Outbound goes to openrouter.ai. Identity checked October 21, 2026. Score null is from the run on October 21, 2026.
Grade
We tried it ourselves. Grade B.
- Grade
- B · We tried it
- Score
- 7/10
- Price
- Freemium
Best for
Jobs people use this for.
Test details
550B mixture-of-experts chat model from NVIDIA, free on OpenRouter with a daily cap. The license is not verified.
Hands-on review · 2026-10-21
TestedB7/10- CPU-only box: 8 cores, 15 GB RAM, no GPU.
- Hosted; small battery
Nemotron 3 Ultra got everything right on code and reasoning but blew the summary word limit in both runs. It was also slower than its smaller sibling. On this battery, bigger did not mean better.
6/8, misses instruction limits on length.
- Coverage
- Same 4-task battery, 2 runs, through OpenRouter's free route
- What we tested
- Same 4-task battery, 2 runs.
Method
OpenRouter nvidia/nemotron-3-ultra-550b-a55b:free, temperature 0.
Measured
- pass_rate6/8 (both summaries over the limit: 77 and 83 words)
- latency1.6-11.5 s
- run1.codepassed, 6/6 unit cases, wall 2.21 s, 210 out tokens
- run1.reason1passed, expect 5, wall 3.66 s, 99 out tokens
- run1.reason2passed, expect 5, wall 5.11 s, 73 out tokens
- run1.summaryfailed, 77 words, 3/3 key terms, wall 11.5 s, 175 out tokens
- run2.codepassed, 6/6 unit cases, wall 2.57 s, 306 out tokens
- run2.reason1passed, expect 5, wall 5.07 s, 99 out tokens
- run2.reason2passed, expect 5, wall 1.57 s, 72 out tokens
- run2.summaryfailed, 83 words, 3/3 key terms, wall 2.29 s, 215 out tokens
Pros
- Correct code and both trick questions in both runs
Cons
- Ignored the 60-word limit twice
- Slower and more variable than the Super model (up to 11.5 s)
- Status
- Not run
- Date
- October 21, 2026
- Time to first output
- —
- Cost
- —
- Result
- —
- Evidence
- Log linked below
Queued task. Answer a fixed research brief. Log whether claims cite sources, time to a usable answer, and cost.
FAQ
What is the agent-tested verdict for NVIDIA Nemotron 3 Ultra?
A very large chat model you can try free, with a daily limit. It's for people who write code. There's a free plan, and a paid plan if you need more. We tried it ourselves. Grade B.
How much does NVIDIA Nemotron 3 Ultra cost?
Freemium. Freemium (free on OpenRouter with daily cap)
Do sponsors outrank this tool?
No. A sponsored slot is labeled and sold separately from tiers. It cannot move this listing.