# Claude Instant vs GPT-5.5 Pro

> GPT-5.5 Pro has enough public results to be ranked (#7); Claude Instant does not yet, so treat this comparison as directional.

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

## Summary

- They share 2 benchmarks with published results for both. Claude Instant scores higher in 0 categories and GPT-5.5 Pro in 1 category; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.6 to 18.8.
- The biggest single-benchmark swing is DTBench: 45.8% for Claude Instant and 96% for GPT-5.5 Pro.

## Snapshot

| | Claude Instant | GPT-5.5 Pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 28.8 | 64.3 |
| Rank | — | 7 |
| Context | — | 1.05M |
| Input $/M | — | $30 |
| Output $/M | — | $180 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Instant: —
- GPT-5.5 Pro: —

| Benchmark | Claude Instant | GPT-5.5 Pro |
|---|---|---|
| HumanEval+ | 50.6% | — |

## Reasoning

- Claude Instant: 18.8
- GPT-5.5 Pro: 73.6 (#7)

| Benchmark | Claude Instant | GPT-5.5 Pro |
|---|---|---|
| DTBench | 45.8% | 96% |
| Epoch Capabilities Index | 120.2 | 162.45 |
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| LMCA | — | 53.9% |

## Math

- Claude Instant: —
- GPT-5.5 Pro: 83.8 (#8)

| Benchmark | Claude Instant | GPT-5.5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |
| GSM8K | 86.7% | — |

## Knowledge

- Claude Instant: —
- GPT-5.5 Pro: 64.2 (#17)

| Benchmark | Claude Instant | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | — | 93.9% |
| ARC (AI2) Challenge | 86.3% | — |
| MMLU | 73.4% | — |
| TriviaQA | 78.9% | — |

## FAQ

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

GPT-5.5 Pro has enough public results to be ranked (#7); Claude Instant does not yet, so treat this comparison as directional.

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

2 benchmarks have published results for both models. Claude Instant has 7 scored results on Noometry and GPT-5.5 Pro has 14.