# GPT-5 nano vs Grok 4.1 Fast

> Side-by-side benchmark comparison for GPT-5 nano and Grok 4.1 Fast across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-nano-vs-grok-4-1-fast
- Last updated: September 4, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for GPT-5 nano and Grok 4.1 Fast.

## Summary

- GPT-5 nano and Grok 4.1 Fast do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | GPT-5 nano | Grok 4.1 Fast |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 400K | 1M |
| Independent public score (not head-to-head) | 39.72 | 49.8 |
| Benchmarks Covered | 0 | 1 |
| Pricing (input/output) | $0.05 / $0.40 | $0.20 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5 nano public-lane score: Coming soon
- Grok 4.1 Fast public-lane score: Coming soon

| Benchmark | GPT-5 nano | Grok 4.1 Fast | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | Coming soon | 47.32% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5 nano public-lane score: Coming soon
- Grok 4.1 Fast public-lane score: 47.5 (Estimated · #88/183)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5 nano public-lane score: Coming soon
- Grok 4.1 Fast public-lane score: 31.3 (Unranked · 1 rankable row)

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5 nano public-lane score: Coming soon
- Grok 4.1 Fast public-lane score: 41.7 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5 nano public-lane score: Coming soon
- Grok 4.1 Fast public-lane score: 42.1 (Estimated · #130/181)

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5 nano public-lane score: Coming soon
- Grok 4.1 Fast public-lane score: 41.8 (#99/120)

## FAQ

### Can I compare GPT-5 nano and Grok 4.1 Fast on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [GPT-5 nano vs GPT-5 (high)](/compare/gpt-5-high-vs-gpt-5-nano)
- [Grok 4.1 Fast vs GPT-5 (high)](/compare/gpt-5-high-vs-grok-4-1-fast)
- [GPT-5 nano vs GPT-5 (medium)](/compare/gpt-5-medium-vs-gpt-5-nano)
- [Grok 4.1 Fast vs GPT-5 (medium)](/compare/gpt-5-medium-vs-grok-4-1-fast)

## Explore More

- [GPT-5 nano profile](/models/gpt-5-nano)
- [Grok 4.1 Fast profile](/models/grok-4-1-fast)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)