Model comparison
Gemma 4 26B A4B vs GPT-5.5 Pro
Head-to-head evidence from 3 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Gemma 4 26B A4B #67 (Supported); GPT-5.5 Pro #38 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Gemma 4 26B A4B and GPT-5.5 Pro share 3 comparable benchmark results. 1 of 8 categories are comparable. 17 results are unique to Gemma 4 26B A4B; 4 to GPT-5.5 Pro.
Updated July 22, 2026- Shared results
- 3
- Gemma 4 26B A4B only
- 17
- GPT-5.5 Pro only
- 4
- Comparable categories
- 1 / 8
Pick GPT-5.5 Pro if you want the stronger benchmark profile. Gemma 4 26B A4B only becomes the better choice if you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 2 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
GPT-5.5 Pro is clearly ahead on the BenchAlign aggregate, 63.69 to 57.96. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5 Pro's sharpest advantage is in knowledge, where it averages 57.2 against 43.4. The single biggest benchmark swing on the page is HLE, 17.2% to 57.2%.
GPT-5.5 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Gemma 4 26B A4B. That is roughly Infinityx on output cost alone. GPT-5.5 Pro gives you the larger context window at 1M, compared with 256K for Gemma 4 26B A4B.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Gemma 4 26B A4B | Δ | GPT-5.5 Pro |
|---|---|---|---|
| Knowledge | Gemma 4 26B A4B43.4 | Margin→ 13.8 | GPT-5.5 Pro57.2 |
| Agentic | Gemma 4 26B A4BNot measured | MarginNo overlap | GPT-5.5 Pro90.1 |
| Math | Gemma 4 26B A4BNot measured | MarginNo overlap | GPT-5.5 Pro48.1 |
| Multimodal | Gemma 4 26B A4B73.8 | MarginNo overlap | GPT-5.5 ProNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
HLE
KnowledgeA 17.2%B 57.2%Winner: GPT-5.5 ProΔ 40HLE: Gemma 4 26B A4B scored 17.2%; GPT-5.5 Pro scored 57.2%. GPT-5.5 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Gemma 4 26B A4B | GPT-5.5 Pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Gemma 4 26B A4B$0 input / $0 output | GPT-5.5 Pro$30 input / $180 output | Gemma 4 26B A4B has the lower combined listed price. |
| Generation speedtokens per second | Gemma 4 26B A4BNot available | GPT-5.5 ProNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Gemma 4 26B A4BNot available | GPT-5.5 ProNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Gemma 4 26B A4B256K | GPT-5.5 Pro1M | GPT-5.5 Pro lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding2 benchmarks
Reasoning2 benchmarks
KnowledgeGPT-5.5 Pro wins9 benchmarks
| Benchmark | Gemma 4 26B A4B | GPT-5.5 Pro | Result |
|---|---|---|---|
| MMLU-ProSource | 82.6% | — | Not comparable |
| HLESource | 17.2% | 57.2% | GPT-5.5 Pro leads |
| HLE w/o toolsSource | 8.7% | 43.1% | GPT-5.5 Pro leads |
| Artificial Analysis Intelligence IndexSource | 25.7% | — | Not comparable |
| AA-GPQA DiamondSource | 79.2% | — | Not comparable |
| AA-HLESource | 18.3% | — | Not comparable |
| AA-Omniscience IndexSource | -48.1% | — | Not comparable |
| AA-Omniscience AccuracySource | 18.2% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 80.9% | — | Not comparable |
Math3 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Gemma 4 26B A4B | GPT-5.5 Pro | Result |
|---|---|---|---|
| AA-IFBenchSource | 72.4% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, Gemma 4 26B A4B or GPT-5.5 Pro?
GPT-5.5 Pro is ahead on BenchLM's BenchAlign leaderboard, 63.69 to 57.96. The biggest single separator in this matchup is HLE, where the scores are 17.2% and 57.2%.
Which is better for knowledge tasks, Gemma 4 26B A4B or GPT-5.5 Pro?
GPT-5.5 Pro has the edge for knowledge tasks in this comparison, averaging 57.2 versus 43.4. Inside this category, HLE is the benchmark that creates the most daylight between them.
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