Agnes 2.5 Pro Beta vs GPT-5.5 Pro
Agnes 2.5 Pro Beta 
GPT-5.5 Pro Verdict
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 60.8.
- Agnes 2.5 Pro Beta is stronger in agents & tools, composite, knowledge, long context, multimodal.
- GPT-5.5 Pro (xhigh) is stronger in reasoning, maths.
- Agnes 2.5 Pro Beta is 450× cheaper ($0.150 vs $67.50 per 1M blended).
| Metric | Agnes 2.5 Pro Beta | GPT-5.5 Pro (xhigh) |
|---|---|---|
| BenchLeader Index | 60.8 | 67.1 |
| Agents & tools score | 64.4 | – |
| Composite score | 73.7 | – |
| Knowledge score | 59.2 | – |
| Long context score | 68.0 | – |
| Multimodal score | 59.8 | – |
| Reasoning score | 72.2 | 80.1 |
| Maths score | – | 74.5 |
| Blended price $/M | $0.150 | $67.50 |
| Output speed | – | 4 tok/s |
| Time to first answer | – | 3.5 s |
| Context window | 1M | 1.1M |
| FrontierMath Tiers 1–3 | – | 87.7% |
| FrontierMath Tier 4 | – | 78.0% |
| AA Intelligence Index | 35.2 | – |
| AA-LCR | 83.0% | – |
| MMMU-Pro | 75.4% | – |
| AA-Omniscience | -10.5 | – |
| GPQA Diamond (AA) | 90.5% | – |
| Humanity's Last Exam (AA) | 37.5% | – |
| SciCode (AA) | 48.8% | – |
| ARC-AGI-1 | – | 95.0% |
| ARC-AGI-2 | – | 84.2% |
| CritPt | 15.7% | 30.6% |
| GDPval (AA) | 43.8% | – |
| τ²-Bench Banking (AA) | 35.7% | – |
| LMCA | – | 53.9% |
| DTBench | – | 96.0% |
Data as of 2026-09-19. Best configuration of each model; every score links to its source on the model pages.
Agnes 2.5 Pro Beta vs GPT-5.5 Pro: questions
- Is Agnes 2.5 Pro Beta better than GPT-5.5 Pro?
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 60.8. The BenchLeader Index combines every independent quality benchmark; GPT-5.5 Pro (xhigh) is ahead overall as of 2026-09-19, but check the category scores for your use.
- Which is cheaper, Agnes 2.5 Pro Beta or GPT-5.5 Pro?
- Agnes 2.5 Pro Beta is cheaper: $0.150 against $67.50 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- GPT-5.5 Pro accepts more context: 1.1M against 1M tokens.