# Claude 2 vs GPT-5.5 Instant

> GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 24.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-2-vs-gpt-5-5-instant
- Last updated: 2026-10-10
- Shared benchmarks: 3

## Summary

- They share 3 benchmarks with published results for both. Claude 2 scores higher in 0 categories and GPT-5.5 Instant in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 17.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 2 and 68.1% for GPT-5.5 Instant.

## Snapshot

| | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 24.7 | 42.5 |
| Rank | 342 | 99 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 2: —
- GPT-5.5 Instant: 43.7 (#73)

| Benchmark | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| SciCode | — | 48.6% |
| LMArena Coding | — | 1433 |
| HumanEval+ | 61.6% | — |

## Reasoning

- Claude 2: 20.8 (#213)
- GPT-5.5 Instant: 24.2 (#149)

| Benchmark | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| Epoch Capabilities Index | 120.08 | 142.48 |
| CritPt | — | 0% |
| Chess Puzzles | — | 12% |
| LMArena Hard Prompts | — | 1426 |
| DTBench | 51.9% | — |

## Math

- Claude 2: 8.7 (#314)
- GPT-5.5 Instant: 26.1 (#241)

| Benchmark | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 68.1% |
| FrontierMath (Tiers 1-3) | — | 26.3% |
| FrontierMath Tier 4 | — | 2.4% |
| LMArena Math | — | 1420 |
| MATH Level 5 | 11.7% | — |

## Knowledge

- Claude 2: 17.0 (#282)
- GPT-5.5 Instant: 48.9 (#68)

| Benchmark | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| GPQA Diamond | 34.7% | 82.5% |
| LMArena Expert | — | 1409 |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |

## Multimodal

- Claude 2: —
- GPT-5.5 Instant: 39.3 (#48)

| Benchmark | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | — | 1250 |
| LMArena Document | — | 1403 |

## Multilingual

- Claude 2: —
- GPT-5.5 Instant: 53.0 (#76)

| Benchmark | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | — | 1417 |
| LMArena Chinese | — | 1457 |
| LMArena French | — | 1428 |
| LMArena German | — | 1410 |
| LMArena Japanese | — | 1408 |
| LMArena Korean | — | 1393 |
| LMArena Russian | — | 1430 |
| LMArena Spanish | — | 1430 |

## Instruction Following

- Claude 2: —
- GPT-5.5 Instant: 74.4 (#94)

| Benchmark | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | — | 1407 |

## Long Context

- Claude 2: —
- GPT-5.5 Instant: 43.4 (#92)

| Benchmark | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | — | 1422 |

## Writing & Preference

- Claude 2: —
- GPT-5.5 Instant: 62.0 (#81)

| Benchmark | Claude 2 | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | — | 1419 |
| LMArena Creative Writing | — | 1420 |
| LMArena Multi-Turn | — | 1434 |

## FAQ

### Is Claude 2 better than GPT-5.5 Instant?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 24.7 on the Noometry Index.

### How many benchmarks do Claude 2 and GPT-5.5 Instant share?

3 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and GPT-5.5 Instant has 27.