# GPT-4o vs Grok 4.1 Fast

> Side-by-side benchmark comparison for GPT-4o and Grok 4.1 Fast across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-4o-vs-grok-4-1-fast
- Last updated: October 17, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for GPT-4o and Grok 4.1 Fast.

## Summary

- GPT-4o 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-4o | Grok 4.1 Fast |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 128K | 1M |
| Independent public score (not head-to-head) | 29.92 | 36.45 |
| Benchmarks Covered | 2 | 1 |
| Pricing (input/output) | $2.50 / $10.00 | $0.20 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: Coming soon
- Grok 4.1 Fast public-lane score: Coming soon

| Benchmark | GPT-4o | Grok 4.1 Fast | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | Coming soon | 47.32% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: 59.7 (Unranked · 2 rankable rows)
- Grok 4.1 Fast public-lane score: 47.4 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: Coming soon
- Grok 4.1 Fast public-lane score: 35.9 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: 27.9 (Estimated · #162/184)
- Grok 4.1 Fast public-lane score: 31.5 (Estimated · #149/184)

### Multilingual

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: 30.2 (#16/17)
- Grok 4.1 Fast public-lane score: Coming soon

| Benchmark | GPT-4o | Grok 4.1 Fast | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 61.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: 39 (#121/148)
- Grok 4.1 Fast public-lane score: 41.9 (#114/148)

### Mathematics

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: 27 (Unranked · 1 rankable row)
- Grok 4.1 Fast public-lane score: Coming soon

| Benchmark | GPT-4o | Grok 4.1 Fast | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 0.351% | Coming soon | Coming soon |

## FAQ

### Can I compare GPT-4o 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-4o vs GPT-4o mini](/compare/gpt-4o-vs-gpt-4o-mini)
- [Grok 4.1 Fast vs GPT-4o mini](/compare/gpt-4o-mini-vs-grok-4-1-fast)
- [GPT-4o vs Grok 4.1 Fast (Reasoning)](/compare/gpt-4o-vs-grok-4-1-fast-reasoning)
- [Grok 4.1 Fast vs Grok 4.1 Fast (Reasoning)](/compare/grok-4-1-fast-vs-grok-4-1-fast-reasoning)

## Explore More

- [GPT-4o profile](/models/gpt-4o)
- [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)