# GPT-5.4 Pro vs Pareto 26.9

> Side-by-side benchmark comparison for GPT-5.4 Pro and Pareto 26.9 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-4-pro-vs-pareto-26-9
- Last updated: September 18, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.4 Pro and Pareto 26.9 share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Pareto 26.9 has the lower published output-token price.
- GPT-5.4 Pro has the larger published context window at 1.05M.

## Model Snapshot

| Property | GPT-5.4 Pro | Pareto 26.9 |
|----------|----------|----------|
| Creator | OpenAI | Unbiased |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | N/A |
| Independent public score (not head-to-head) | 60.49 | null |
| Benchmarks Covered | 10 | 4 |
| Pricing (input/output) | $30.00 / $180.00 | $2.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: 56.4 (Estimated · #35/154)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 89.3% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 51.00% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: Coming soon
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | Coming soon | 74.0% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: Coming soon
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 78% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: 70.2 (Unranked · 2 rankable rows)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 83.3% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: 59 (Estimated · #39/184)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 58.7% | Coming soon | Coming soon |
| FrontierScience | 36.7% | Coming soon | Coming soon |
| FrontierScience Research | 36.7% | Coming soon | Coming soon |
| HLE w/o tools | 42.7% | 49% | Pareto 26.9 |

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: 68.8 (Unranked · 4 rankable rows)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| IPhO 2025 (Theory) | 93.5% | Coming soon | Coming soon |
| FrontierMath (legacy) | 50% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 50.000% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 37.500% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-5.4 Pro and Pareto 26.9?

Not yet. The models share only 1 sourced benchmark row, 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-5.4 Pro vs GPT-5.4](/compare/gpt-5-4-vs-gpt-5-4-pro)
- [Pareto 26.9 vs GPT-5.4](/compare/gpt-5-4-vs-pareto-26-9)
- [GPT-5.4 Pro vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-gpt-5-4-pro)
- [Pareto 26.9 vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-pareto-26-9)

## Explore More

- [GPT-5.4 Pro profile](/models/gpt-5-4-pro)
- [Pareto 26.9 profile](/models/pareto-26-9)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)