Grok Code Fast 1 vs Nemotron 3 Ultra (550B A55B)
Grok Code Fast 1 and Nemotron 3 Ultra (550B A55B) are closely matched at 20.7 and 36.0 on the LLM Stats Score. Grok Code Fast 1 is 1.8x cheaper per token.
xAI · NVIDIA · Updated for 2026
Which is better?
Grok Code Fast 1 and Nemotron 3 Ultra (550B A55B) are closely matched on the overall LLM Stats Score at 20.7 and 36.0.
In the 1 individual benchmarks reported for both models, Grok Code Fast 1 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Grok Code Fast 1 is roughly 1.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Nemotron 3 Ultra (550B A55B) also accepts a larger context window (262,144 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Grok Code Fast 1
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- cost matters — it's about 1.8x cheaper per token
Choose Nemotron 3 Ultra (550B A55B)
- you process long inputs — it offers a 262,144 token context window
- you want the most recent training data — it shipped Jun 2026
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
1 reported for Grok Code Fast 1 · 26 for Nemotron 3 Ultra (550B A55B)
Grok Code Fast 1 outperforms in 1 benchmarks (SWE-Bench Verified), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks.
Grok Code Fast 1 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Grok Code Fast 1 ($0.20/1M tokens) is 2.5x cheaper than Nemotron 3 Ultra (550B A55B) ($0.50/1M tokens).
For output processing, Grok Code Fast 1 ($1.50/1M tokens) is 1.5x cheaper than Nemotron 3 Ultra (550B A55B) ($2.20/1M tokens).
In conclusion, Nemotron 3 Ultra (550B A55B) is more expensive than Grok Code Fast 1.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Nemotron 3 Ultra (550B A55B) accepts 262,144 input tokens compared to Grok Code Fast 1's 256,000 tokens. Nemotron 3 Ultra (550B A55B) can generate longer responses up to 262,144 tokens, while Grok Code Fast 1 is limited to 10,000 tokens.
License
Usage and distribution terms
Grok Code Fast 1 is licensed under a proprietary license, while Nemotron 3 Ultra (550B A55B) uses OpenMDW License v1.1.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
OpenMDW License v1.1
Open weights
Release Timeline
When each model was launched
Grok Code Fast 1 was released on 2025-08-28, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.
Nemotron 3 Ultra (550B A55B) is 9 months newer than Grok Code Fast 1.
Aug 28, 2025
1.1 years ago
Jun 4, 2026
4 months ago
9mo newerKnowledge Cutoff
When training data ends
Nemotron 3 Ultra (550B A55B) has a documented knowledge cutoff of 2025-09-30, while Grok Code Fast 1's cutoff date is not specified.
We can confirm Nemotron 3 Ultra (550B A55B)'s training data extends to 2025-09-30, but cannot make a direct comparison without Grok Code Fast 1's cutoff date.
—
Sep 2025
Provider Availability
Grok Code Fast 1 is available from xAI. Nemotron 3 Ultra (550B A55B) is available from DeepInfra.
Grok Code Fast 1
Nemotron 3 Ultra (550B A55B)
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok Code Fast 1 and Nemotron 3 Ultra (550B A55B) side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok Code Fast 1 vs Nemotron 3 Ultra (550B A55B).