# Gemma 4 26B A4B vs GPT-5.5 Pro

> Side-by-side benchmark comparison for Gemma 4 26B A4B and GPT-5.5 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemma-4-26b-a4b-vs-gpt-5-5-pro
- Last updated: September 21, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemma 4 26B A4B and GPT-5.5 Pro 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.
- Gemma 4 26B A4B has the lower published output-token price.
- GPT-5.5 Pro has the larger published context window at 1M.

## Model Snapshot

| Property | Gemma 4 26B A4B | GPT-5.5 Pro |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 1M |
| Independent public score (not head-to-head) | 55.16 | 62.08 |
| Benchmarks Covered | 4 | 6 |
| Pricing (input/output) | $0.00 / $0.00 | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemma 4 26B A4B public-lane score: 51.9 (Estimated · #45/154)
- GPT-5.5 Pro public-lane score: 59.1 (Estimated · #28/154)

| Benchmark | Gemma 4 26B A4B | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | Coming soon | 90.1% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemma 4 26B A4B public-lane score: 41.2 (Supported · #112/154)
- GPT-5.5 Pro public-lane score: Coming soon

### Reasoning

- Winner: Insufficient shared evidence
- Gemma 4 26B A4B public-lane score: 66.2 (Unranked · 2 rankable rows)
- GPT-5.5 Pro public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemma 4 26B A4B public-lane score: 44.2 (#42/49)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | Gemma 4 26B A4B | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 73.8% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemma 4 26B A4B public-lane score: 43.2 (Supported · #122/184)
- GPT-5.5 Pro public-lane score: 59.6 (Estimated · #38/184)

| Benchmark | Gemma 4 26B A4B | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| MMLU-Pro | 82.6% | Coming soon | Coming soon |
| HLE | 17.2% | 57.2% | GPT-5.5 Pro |
| HLE w/o tools | 8.7% | 43.1% | GPT-5.5 Pro |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemma 4 26B A4B public-lane score: 87.3 (#31/124)
- GPT-5.5 Pro public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- Gemma 4 26B A4B public-lane score: Coming soon
- GPT-5.5 Pro public-lane score: 70.1 (Unranked · 3 rankable rows)

| Benchmark | Gemma 4 26B A4B | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | Coming soon | 52.4% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 51.000% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 39.600% | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemma 4 26B A4B and GPT-5.5 Pro?

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

- [Gemma 4 26B A4B vs Gemma 4 31B](/compare/gemma-4-26b-a4b-vs-gemma-4-31b)
- [GPT-5.5 Pro vs Gemma 4 31B](/compare/gemma-4-31b-vs-gpt-5-5-pro)
- [Gemma 4 26B A4B vs Gemma 4 12B](/compare/gemma-4-12b-vs-gemma-4-26b-a4b)
- [GPT-5.5 Pro vs Gemma 4 12B](/compare/gemma-4-12b-vs-gpt-5-5-pro)

## Explore More

- [Gemma 4 26B A4B profile](/models/gemma-4-26b-a4b)
- [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)