# GPT-5.5 Pro vs Trinity Large Thinking

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 38.1 on the Noometry Index. Trinity Large Thinking costs 174× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-trinity-large-thinking
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.5 Pro scores higher in 3 categories and Trinity Large Thinking in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.6 to 16.3.
- The biggest single-benchmark swing is CritPt: 30.6% for GPT-5.5 Pro and 0.9% for Trinity Large Thinking.
- Trinity Large Thinking is cheaper at $0.25 / $0.80 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 262K.
- Trinity Large Thinking has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Pro | Trinity Large Thinking |
|---|---|---|
| Provider | OpenAI | Arcee AI |
| Noometry Index | 64.3 | 38.1 |
| Rank | 7 | 180 |
| Context | 1.05M | 262K |
| Input $/M | $30 | $0.25 |
| Output $/M | $180 | $0.80 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Pro: —
- Trinity Large Thinking: 33.8 (#238)

| Benchmark | GPT-5.5 Pro | Trinity Large Thinking |
|---|---|---|
| LMArena WebDev | — | 1238 |
| SciCode | — | 36.1% |
| LMArena Coding | — | 1381 |

## Reasoning

- GPT-5.5 Pro: 73.6 (#7)
- Trinity Large Thinking: 16.3 (#298)

| Benchmark | GPT-5.5 Pro | Trinity Large Thinking |
|---|---|---|
| CritPt | 30.6% | 0.9% |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| NYT Connections (extended) | — | 16.5% |
| ARC-AGI-1 | 96.5% | — |
| Chess Puzzles | 64% | — |
| Thematic Generalization | — | 41.6% |
| LMArena Hard Prompts | — | 1350 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Surface Evolver Bench | — | 15.6% |
| Epoch Capabilities Index | 162.45 | — |

## Math

- GPT-5.5 Pro: 83.8 (#8)
- Trinity Large Thinking: 34.9 (#149)

| Benchmark | GPT-5.5 Pro | Trinity Large Thinking |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| LMArena Math | — | 1366 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |

## Knowledge

- GPT-5.5 Pro: 64.2 (#17)
- Trinity Large Thinking: 40.3 (#107)

| Benchmark | GPT-5.5 Pro | Trinity Large Thinking |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| Vectara Hallucination Rate | — | 6.9% |
| LMArena Expert | — | 1359 |

## Multilingual

- GPT-5.5 Pro: —
- Trinity Large Thinking: 46.4 (#155)

| Benchmark | GPT-5.5 Pro | Trinity Large Thinking |
|---|---|---|
| LMArena Non-English | — | 1325 |
| LMArena Chinese | — | 1372 |
| LMArena French | — | 1374 |
| LMArena German | — | 1356 |
| LMArena Japanese | — | 1312 |
| LMArena Korean | — | 1304 |
| LMArena Russian | — | 1338 |
| LMArena Spanish | — | 1356 |

## Instruction Following

- GPT-5.5 Pro: —
- Trinity Large Thinking: 70.7 (#157)

| Benchmark | GPT-5.5 Pro | Trinity Large Thinking |
|---|---|---|
| LMArena Instruction Following | — | 1334 |

## Long Context

- GPT-5.5 Pro: —
- Trinity Large Thinking: 41.2 (#139)

| Benchmark | GPT-5.5 Pro | Trinity Large Thinking |
|---|---|---|
| LMArena Longer Query | — | 1355 |

## Writing & Preference

- GPT-5.5 Pro: —
- Trinity Large Thinking: 54.0 (#152)

| Benchmark | GPT-5.5 Pro | Trinity Large Thinking |
|---|---|---|
| LMArena Text | — | 1340 |
| LMArena Creative Writing | — | 1321 |
| LMArena Multi-Turn | — | 1342 |

## FAQ

### Is GPT-5.5 Pro better than Trinity Large Thinking?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 38.1 on the Noometry Index. Trinity Large Thinking costs 174× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.5 Pro or Trinity Large Thinking?

Trinity Large Thinking is cheaper. It lists at $0.25 per million input tokens and $0.80 per million output tokens; GPT-5.5 Pro lists at $30 and $180.

### Which has the bigger context window?

GPT-5.5 Pro does, with 1.05M tokens against 262K.

### How many benchmarks do GPT-5.5 Pro and Trinity Large Thinking share?

1 benchmark has published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Trinity Large Thinking has 24.