Model comparison
Grok Code Fast 1 vs Nemotron Ultra 253B
Head-to-head evidence from 11 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Grok Code Fast 1 #180 (Supported); Nemotron Ultra 253B #150 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Grok Code Fast 1 and Nemotron Ultra 253B share 11 comparable benchmark results. 0 of 8 categories are comparable. 1 result is unique to Grok Code Fast 1; 0 to Nemotron Ultra 253B.
Updated July 20, 2026- Shared results
- 11
- Grok Code Fast 1 only
- 1
- Nemotron Ultra 253B only
- 0
- Comparable categories
- 0 / 8
Benchmark data for Grok Code Fast 1 and Nemotron Ultra 253B is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 11 shared benchmark results across 5 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Grok Code Fast 1 is priced at $0.20 input / $1.50 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Nemotron Ultra 253B. Grok Code Fast 1 has the larger context window at 256K, compared with 32K for Nemotron Ultra 253B.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Grok Code Fast 1 | Δ | Nemotron Ultra 253B |
|---|---|---|---|
| Coding | Grok Code Fast 170.8 | MarginNo overlap | Nemotron Ultra 253BNot measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Grok Code Fast 1 | Nemotron Ultra 253B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok Code Fast 1$0.2 input / $1.5 output | Nemotron Ultra 253B$0 input / $0 output | Nemotron Ultra 253B has the lower combined listed price. |
| Generation speedtokens per second | Grok Code Fast 1172 tok/s | Nemotron Ultra 253BNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Grok Code Fast 12.81 s | Nemotron Ultra 253BNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Grok Code Fast 1256K | Nemotron Ultra 253B32K | Grok Code Fast 1 lists the larger context window. |
Benchmark Deep Dive
Agentic1 benchmarks
| Benchmark | Grok Code Fast 1 | Nemotron Ultra 253B | Result |
|---|---|---|---|
| τ²-bench resultsSource | 75.7% | 11.4% | Grok Code Fast 1 leads |
Coding2 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Grok Code Fast 1 | Nemotron Ultra 253B | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 21.6% | 9.1% | Grok Code Fast 1 leads |
| AA-GPQA DiamondSource | 72.7% | 72.8% | Nemotron Ultra 253B leads |
| AA-HLESource | 7.5% | 8.1% | Nemotron Ultra 253B leads |
| AA-Omniscience IndexSource | -36.0% | -45.5% | Grok Code Fast 1 leads |
| AA-Omniscience AccuracySource | 23.8% | 19.9% | Grok Code Fast 1 leads |
| AA-Omniscience Hallucination RateSource | 78.5% | 81.7% | Grok Code Fast 1 leads |
Inst. Following1 benchmarks
| Benchmark | Grok Code Fast 1 | Nemotron Ultra 253B | Result |
|---|---|---|---|
| AA-IFBenchSource | 41.4% | 38.2% | Grok Code Fast 1 leads |
Frequently Asked Questions (3)
Can I compare Grok Code Fast 1 and Nemotron Ultra 253B on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Grok Code Fast 1 and Nemotron Ultra 253B today?
Grok Code Fast 1: $0.20 input / $1.50 output per 1M tokens Nemotron Ultra 253B: $0.00 input / $0.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
Related Comparisons
Explore More
Choose a model with this week’s evidence
Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.
One email each week. Unsubscribe anytime.