# Claude Instant vs gpt-oss-20b

> gpt-oss-20b has enough public results to be ranked (#249); Claude Instant does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/claude-instant-vs-gpt-oss-20b
- Last updated: 2026-10-10
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. Claude Instant scores higher in 1 category and gpt-oss-20b in 0 categories, but none of those gaps is larger than the uncertainty.
- The biggest single-benchmark swing is DTBench: 45.8% for Claude Instant and 68% for gpt-oss-20b.
- gpt-oss-20b has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Instant | gpt-oss-20b |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 28.8 | 32.1 |
| Rank | — | 249 |
| Context | — | 131K |
| Input $/M | — | $0.018 |
| Output $/M | — | $0.09 |
| Weights | Proprietary | Open |

## Coding

- Claude Instant: —
- gpt-oss-20b: 37.1 (#185)

| Benchmark | Claude Instant | gpt-oss-20b |
|---|---|---|
| SciCode | — | 34.4% |
| WeirdML | — | 40.9% |
| LMArena Coding | — | 1307 |
| ALE-Bench | — | 566.05 |
| HumanEval+ | 50.6% | — |

## Agentic & Tool Use

- Claude Instant: —
- gpt-oss-20b: 9.2 (#146)

| Benchmark | Claude Instant | gpt-oss-20b |
|---|---|---|
| Terminal-Bench | — | 3.4% |

## Reasoning

- Claude Instant: 18.8
- gpt-oss-20b: 18.8 (#251)

| Benchmark | Claude Instant | gpt-oss-20b |
|---|---|---|
| DTBench | 45.8% | 68% |
| Epoch Capabilities Index | 120.2 | 137.81 |
| Kagi LLM Benchmark | — | 53.2% |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 4% |
| LMArena Hard Prompts | — | 1274 |
| LMCA | — | 14.5% |

## Math

- Claude Instant: —
- gpt-oss-20b: 37.6 (#93)

| Benchmark | Claude Instant | gpt-oss-20b |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 65.3% |
| Omni-MATH | — | 56.5% |
| LMArena Math | — | 1317 |
| GSM8K | 86.7% | — |

## Knowledge

- Claude Instant: —
- gpt-oss-20b: 34.6 (#186)

| Benchmark | Claude Instant | gpt-oss-20b |
|---|---|---|
| GPQA Diamond | — | 60.8% |
| MMLU-Pro | — | 74% |
| GPQA (HELM) | — | 59.4% |
| LMArena Expert | — | 1258 |
| ARC (AI2) Challenge | 86.3% | — |
| MMLU | 73.4% | — |
| TriviaQA | 78.9% | — |

## Multilingual

- Claude Instant: —
- gpt-oss-20b: 42.4 (#192)

| Benchmark | Claude Instant | gpt-oss-20b |
|---|---|---|
| LMArena Non-English | — | 1269 |
| LMArena Chinese | — | 1311 |
| LMArena German | — | 1249 |
| LMArena Japanese | — | 1245 |
| LMArena Korean | — | 1239 |
| LMArena Russian | — | 1279 |
| LMArena Spanish | — | 1267 |

## Instruction Following

- Claude Instant: —
- gpt-oss-20b: 62.0 (#235)

| Benchmark | Claude Instant | gpt-oss-20b |
|---|---|---|
| IFEval | — | 73.2% |
| LMArena Instruction Following | — | 1236 |

## Long Context

- Claude Instant: —
- gpt-oss-20b: 37.9 (#203)

| Benchmark | Claude Instant | gpt-oss-20b |
|---|---|---|
| LMArena Longer Query | — | 1251 |

## Writing & Preference

- Claude Instant: —
- gpt-oss-20b: 35.8 (#260)

| Benchmark | Claude Instant | gpt-oss-20b |
|---|---|---|
| LMArena Text | — | 1288 |
| LMArena Creative Writing | — | 1201 |
| EQ-Bench Creative Writing | — | 666 |
| WildBench | — | 73.7% |
| LMArena Multi-Turn | — | 1268 |

## FAQ

### Is Claude Instant better than gpt-oss-20b?

gpt-oss-20b has enough public results to be ranked (#249); Claude Instant does not yet, so treat this comparison as directional.

### How many benchmarks do Claude Instant and gpt-oss-20b share?

2 benchmarks have published results for both models. Claude Instant has 7 scored results on Noometry and gpt-oss-20b has 34.