Noometry

Model comparison

Claude 3 Sonnet vs gpt-oss-20b

gpt-oss-20b is the stronger model overall, scoring 32.5 to 29.0 on the Noometry Index.

Last verified . 21 shared benchmarks.

Claude 3 Sonnet Anthropic

29.0

Rank #319 Confirmed

gpt-oss-20b OpenAI

32.5

Rank #255 Confirmed

Summary

  • They share 21 benchmarks with published results for both. Claude 3 Sonnet scores higher in 3 categories and gpt-oss-20b in 5 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where gpt-oss-20b leads 39.4 to 10.7.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 3 Sonnet and 65.3% for gpt-oss-20b.
  • gpt-oss-20b has downloadable open weights; the other is API-only.

Side by side

Claude 3 Sonnetgpt-oss-20b
ProviderAnthropicOpenAI
Noometry Index29.032.5
Released2024-02-292025-08-05
WeightsProprietaryOpen
Context window—131K
Max output—16K
Input $ / M tokens—$0.018
Output $ / M tokens—$0.09
Results tracked3034

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Category by category

Coding gpt-oss-20b leads

Claude 3 Sonnet: 29.6 (#302), gpt-oss-20b: 37.6 (#192)

BenchmarkClaude 3 Sonnetgpt-oss-20b
WeirdML10.2%40.9%
LMArena Coding12231306
SciCode—34.4%
BigCodeBench Instruct42.7%—
BigCodeBench Complete53.8%—
ALE-Bench—566.05
HumanEval+64%—
MBPP+69.3%—

Agentic & Tool Use Not comparable

Claude 3 Sonnet: —, gpt-oss-20b: 9.3 (#154)

BenchmarkClaude 3 Sonnetgpt-oss-20b
Terminal-Bench—3.4%

Reasoning Claude 3 Sonnet leads

Claude 3 Sonnet: 20.5 (#237), gpt-oss-20b: 19.3 (#261)

BenchmarkClaude 3 Sonnetgpt-oss-20b
LMArena Hard Prompts11971274
DTBench53.6%68%
Epoch Capabilities Index120.7137.82
Kagi LLM Benchmark—53.2%
CritPt—1.4%
Chess Puzzles—4%
LMCA—14.5%
WinoGrande75.1%—

Math gpt-oss-20b leads

Claude 3 Sonnet: 10.7 (#310), gpt-oss-20b: 39.4 (#103)

BenchmarkClaude 3 Sonnetgpt-oss-20b
OTIS Mock AIME 2024-20252.5%65.3%
LMArena Math12131317
Omni-MATH—56.5%
MATH Level 518.2%—

Knowledge gpt-oss-20b leads

Claude 3 Sonnet: 21.1 (#276), gpt-oss-20b: 34.6 (#195)

BenchmarkClaude 3 Sonnetgpt-oss-20b
GPQA Diamond40.6%60.8%
LMArena Expert11731258
MMLU-Pro—74%
GPQA (HELM)—59.4%
MMLU75.9%—

Multimodal Not comparable

Claude 3 Sonnet: 25.2 (#125), gpt-oss-20b: —

BenchmarkClaude 3 Sonnetgpt-oss-20b
LMArena Vision984—

Multilingual gpt-oss-20b leads

Claude 3 Sonnet: 37.8 (#234), gpt-oss-20b: 42.2 (#197)

BenchmarkClaude 3 Sonnetgpt-oss-20b
LMArena Non-English12051268
LMArena Chinese11891314
LMArena German12041255
LMArena Japanese11311244
LMArena Korean11281236
LMArena Russian12271278
LMArena Spanish12041267
LMArena French1229—

Instruction Following Claude 3 Sonnet leads

Claude 3 Sonnet: 62.8 (#235), gpt-oss-20b: 61.8 (#240)

BenchmarkClaude 3 Sonnetgpt-oss-20b
LMArena Instruction Following11991236
IFEval—73.2%

Long Context gpt-oss-20b leads

Claude 3 Sonnet: 36.7 (#228), gpt-oss-20b: 37.9 (#209)

BenchmarkClaude 3 Sonnetgpt-oss-20b
LMArena Longer Query12111250

Writing & Preference Claude 3 Sonnet leads

Claude 3 Sonnet: 42.1 (#238), gpt-oss-20b: 35.5 (#265)

BenchmarkClaude 3 Sonnetgpt-oss-20b
LMArena Text12181287
LMArena Creative Writing11861201
LMArena Multi-Turn12271268
EQ-Bench Creative Writing—666
WildBench—73.7%

Frequently asked questions

Is Claude 3 Sonnet better than gpt-oss-20b?

gpt-oss-20b is the stronger model overall, scoring 32.5 to 29.0 on the Noometry Index.

Is Claude 3 Sonnet or gpt-oss-20b better for coding?

gpt-oss-20b scores higher on coding benchmarks: 37.6 versus 29.6 in the Noometry coding category.

How many benchmarks do Claude 3 Sonnet and gpt-oss-20b share?

21 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and gpt-oss-20b has 34.

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