# GPT-5.4 vs Pareto 26.9

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

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

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.4 and Pareto 26.9 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.
- Pareto 26.9 has the lower published output-token price.
- GPT-5.4 has the larger published context window at 1.05M.

## Model Snapshot

| Property | GPT-5.4 | Pareto 26.9 |
|----------|----------|----------|
| Creator | OpenAI | Unbiased |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | N/A |
| Independent public score (not head-to-head) | 70.88 | null |
| Benchmarks Covered | 38 | 4 |
| Pricing (input/output) | $2.50 / $15.00 | $2.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.4 public-lane score: 53.2 (Supported · #41/154)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 75.1% | Coming soon | Coming soon |
| CyberGym | 79.0% | Coming soon | Coming soon |
| BrowseComp | 82.7% | Coming soon | Coming soon |
| OSWorld-Verified | 75% | Coming soon | Coming soon |
| MCP Atlas | 70.6% | Coming soon | Coming soon |
| Toolathlon | 54.6% | Coming soon | Coming soon |
| τ²-bench results | 98.9% | Coming soon | Coming soon |
| Claw-Eval | 60.3% | Coming soon | Coming soon |
| DeepSearchQA | 73.6% | Coming soon | Coming soon |
| Gert Labs | 64.89% | Coming soon | Coming soon |
| ResearchClawBench | 15.3% | Coming soon | Coming soon |
| JobBench | 38.9% | Coming soon | Coming soon |
| ExploitGym | 6.0% | Coming soon | Coming soon |
| ApprenticeBench | 11% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 51.00% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.4 public-lane score: 53.8 (Supported · #43/154)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench Pro | 87.5% | Coming soon | Coming soon |
| SWE-bench Pro | 57.7% | Coming soon | Coming soon |
| React Native Evals | 85.3% | Coming soon | Coming soon |
| Vibe Code Bench | 67.42% | Coming soon | Coming soon |
| DeepSWE | Coming soon | 74.0% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.4 public-lane score: 69.3 (#20/48)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 81.2% | 78% | GPT-5.4 |
| OfficeQA Pro | 53.2% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 82.1% | Coming soon | Coming soon |
| CharXiv | 82.8% | Coming soon | Coming soon |
| ERQA | 65.4% | Coming soon | Coming soon |
| SimpleVQA | 61.1% | Coming soon | Coming soon |
| ScreenSpot Pro | 85.4% | Coming soon | Coming soon |
| ZeroBench | 41.0% | Coming soon | Coming soon |
| MedXpertQA (MM) | 77.1% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.4 public-lane score: 57.2 (#17/20)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 74.0% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.2% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.4 public-lane score: 69.2 (Supported · #16/184)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.8% | Coming soon | Coming soon |
| HLE | 52.1% | Coming soon | Coming soon |
| HLE w/o tools | 39.8% | 49% | Pareto 26.9 |
| GPQA-D | 92.8% | Coming soon | Coming soon |
| HealthBench Hard | 40.1% | Coming soon | Coming soon |
| MedXpertQA (Text) | 59.6% | Coming soon | Coming soon |
| HealthBench Professional | 48.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.4 public-lane score: 89.2 (#19/124)
- Pareto 26.9 public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.4 public-lane score: 64.4 (Unranked · 2 rankable rows)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.4 | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 47.600% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 27.100% | Coming soon | Coming soon |

## FAQ

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

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-5.4 vs GPT-5.4 mini](/compare/gpt-5-4-vs-gpt-5-4-mini)
- [Pareto 26.9 vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-pareto-26-9)
- [GPT-5.4 vs GPT-5.4 Pro](/compare/gpt-5-4-vs-gpt-5-4-pro)
- [Pareto 26.9 vs GPT-5.4 Pro](/compare/gpt-5-4-pro-vs-pareto-26-9)

## Explore More

- [GPT-5.4 profile](/models/gpt-5-4)
- [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)