# GPT-5.5 Pro vs Grok 3 [Beta]

> Side-by-side benchmark comparison for GPT-5.5 Pro and Grok 3 [Beta] across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-5-pro-vs-grok-3-beta
- Last updated: September 4, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.5 Pro and Grok 3 [Beta] share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Grok 3 [Beta] has the lower published output-token price.
- GPT-5.5 Pro has the larger published context window at 1M.

## Model Snapshot

| Property | GPT-5.5 Pro | Grok 3 [Beta] |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 1M | 128K |
| Independent public score (not head-to-head) | 63.07 | 51.65 |
| Benchmarks Covered | 6 | 2 |
| Pricing (input/output) | $30.00 / $180.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.5 Pro public-lane score: 60.6 (Estimated · #24/151)
- Grok 3 [Beta] public-lane score: Coming soon

| Benchmark | GPT-5.5 Pro | Grok 3 [Beta] | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 90.1% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.5 Pro public-lane score: 61.1 (Estimated · #36/181)
- Grok 3 [Beta] public-lane score: Coming soon

| Benchmark | GPT-5.5 Pro | Grok 3 [Beta] | Winner |
|-----------|-----------|-----------|--------|
| HLE | 57.2% | Coming soon | Coming soon |
| HLE w/o tools | 43.1% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.5 Pro public-lane score: 70.2 (Unranked · 3 rankable rows)
- Grok 3 [Beta] public-lane score: 26.9 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.5 Pro | Grok 3 [Beta] | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 52.4% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 51.000% | 3.793% | GPT-5.5 Pro |
| FrontierMath v2 (Tier 4) | 39.600% | 0.000% | GPT-5.5 Pro |

## FAQ

### Is there enough evidence to pick between GPT-5.5 Pro and Grok 3 [Beta]?

Not yet. The models share only 2 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [GPT-5.5 Pro vs GPT-5.5](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [Grok 3 [Beta] vs GPT-5.5](/compare/gpt-5-5-vs-grok-3-beta)
- [GPT-5.5 Pro vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-5-5-pro)
- [Grok 3 [Beta] vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-grok-3-beta)

## Explore More

- [GPT-5.5 Pro profile](/models/gpt-5-5-pro)
- [Grok 3 [Beta] profile](/models/grok-3-beta)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)