# GPT-5.4 Pro vs GPT-5.5 Pro

> Side-by-side benchmark comparison for GPT-5.4 Pro and GPT-5.5 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick GPT-5.5 Pro if you want the stronger benchmark profile. GPT-5.4 Pro only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.5 Pro leads overall 63.07 to 61.75.
- The clearest category separation is in agentic, where the averages are 58.1 for GPT-5.4 Pro and 60.6 for GPT-5.5 Pro.
- The biggest single benchmark swing is FrontierMath (legacy) in Mathematics, with scores of 50% and 52.4%.
- GPT-5.4 Pro also has the larger context window at 1.05M.

## Model Snapshot

| Property | GPT-5.4 Pro | GPT-5.5 Pro |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1M |
| Overall Score | 61.75 | 63.07 |
| Benchmarks Covered | 10 | 6 |
| Pricing (input/output) | $30.00 / $180.00 | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- GPT-5.4 Pro public-lane score: 58.1 (Estimated · #33/151)
- GPT-5.5 Pro public-lane score: 60.6 (Estimated · #24/151)

| Benchmark | GPT-5.4 Pro | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 89.3% | 90.1% | GPT-5.5 Pro |

### Reasoning

- Winner: Coming soon
- GPT-5.4 Pro public-lane score: 70.1 (Unranked · 2 rankable rows)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 83.3% | Coming soon | Coming soon |

### Knowledge

- Winner: Coming soon
- GPT-5.4 Pro public-lane score: 60.7 (Estimated · #39/181)
- GPT-5.5 Pro public-lane score: 61.1 (Estimated · #36/181)

| Benchmark | GPT-5.4 Pro | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| HLE | 58.7% | 57.2% | GPT-5.4 Pro |
| FrontierScience | 36.7% | Coming soon | Coming soon |
| FrontierScience Research | 36.7% | Coming soon | Coming soon |
| HLE w/o tools | 42.7% | 43.1% | GPT-5.5 Pro |

### Mathematics

- Winner: Coming soon
- GPT-5.4 Pro public-lane score: 69 (Unranked · 4 rankable rows)
- GPT-5.5 Pro public-lane score: 70.2 (Unranked · 3 rankable rows)

| Benchmark | GPT-5.4 Pro | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| IPhO 2025 (Theory) | 93.5% | Coming soon | Coming soon |
| FrontierMath (legacy) | 50% | 52.4% | GPT-5.5 Pro |
| FrontierMath v2 (Tiers 1-3) | 50.000% | 51.000% | GPT-5.5 Pro |
| FrontierMath v2 (Tier 4) | 37.500% | 39.600% | GPT-5.5 Pro |

## FAQ

### Which is better overall, GPT-5.4 Pro or GPT-5.5 Pro?

GPT-5.5 Pro is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.4 Pro and GPT-5.5 Pro?

The widest category gap is in agentic, where the averages are 58.1 for GPT-5.4 Pro and 60.6 for GPT-5.5 Pro.

### How many benchmarks does GPT-5.4 Pro cover on BenchLM?

GPT-5.4 Pro currently has 10 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-5.5 Pro cover on BenchLM?

GPT-5.5 Pro currently has 6 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.4 Pro vs GPT-5.4](/compare/gpt-5-4-vs-gpt-5-4-pro)
- [GPT-5.5 Pro vs GPT-5.4](/compare/gpt-5-4-vs-gpt-5-5-pro)
- [GPT-5.4 Pro vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-gpt-5-4-pro)
- [GPT-5.5 Pro vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-gpt-5-5-pro)

## Explore More

- [GPT-5.4 Pro profile](/models/gpt-5-4-pro)
- [GPT-5.5 Pro profile](/models/gpt-5-5-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)