Noometry

Model comparison

gpt-oss-20b vs Nova Premier 1.0

Nova Premier 1.0 is the stronger model overall, scoring 37.7 to 32.1 on the Noometry Index. gpt-oss-20b costs 139× less per token, which makes it the better buy when Nova Premier 1.0's lead doesn't matter for your workload.

Last verified . 6 shared benchmarks.

gpt-oss-20b OpenAI

32.1

Rank #249 Confirmed

Nova Premier 1.0 Amazon

37.7

Rank #185 Confirmed

Summary

  • They share 6 benchmarks with published results for both. gpt-oss-20b scores higher in 1 category and Nova Premier 1.0 in 4 categories; 4 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where Nova Premier 1.0 leads 51.0 to 35.8.
  • The biggest single-benchmark swing is Omni-MATH: 56.5% for gpt-oss-20b and 35% for Nova Premier 1.0.
  • gpt-oss-20b is cheaper at $0.018 / $0.09 per million input/output tokens, against $2.50 / $12.50 for Nova Premier 1.0.
  • Nova Premier 1.0 accepts more context: 1M tokens versus 131K.
  • gpt-oss-20b has downloadable open weights; the other is API-only.

Side by side

gpt-oss-20bNova Premier 1.0
ProviderOpenAIAmazon
Noometry Index32.137.7
Released2025-08-052025-04-30
WeightsOpenProprietary
Context window131K1M
Max output16K10K
Input $ / M tokens$0.018$2.50
Output $ / M tokens$0.09$12.50
Results tracked346

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Category by category

Coding Not comparable

gpt-oss-20b: 37.1 (#185), Nova Premier 1.0: —

Benchmarkgpt-oss-20bNova Premier 1.0
SciCode34.4%—
WeirdML40.9%—
LMArena Coding1307—
ALE-Bench566.05—

Agentic & Tool Use Not comparable

gpt-oss-20b: 9.2 (#146), Nova Premier 1.0: —

Benchmarkgpt-oss-20bNova Premier 1.0
Terminal-Bench3.4%—

Reasoning Nova Premier 1.0 leads

gpt-oss-20b: 18.8 (#251), Nova Premier 1.0: 22.3 (#182)

Benchmarkgpt-oss-20bNova Premier 1.0
Kagi LLM Benchmark53.2%44.8%
CritPt1.4%—
Chess Puzzles4%—
LMArena Hard Prompts1274—
DTBench68%—
LMCA14.5%—
Epoch Capabilities Index137.81—

Math gpt-oss-20b leads

gpt-oss-20b: 37.6 (#93), Nova Premier 1.0: 31.5 (#194)

Benchmarkgpt-oss-20bNova Premier 1.0
Omni-MATH56.5%35%
OTIS Mock AIME 2024-202565.3%—
LMArena Math1317—

Knowledge Too close to call

gpt-oss-20b: 34.6 (#186), Nova Premier 1.0: 35.4 (#176)

Benchmarkgpt-oss-20bNova Premier 1.0
MMLU-Pro74%72.6%
GPQA (HELM)59.4%51.8%
GPQA Diamond60.8%—
LMArena Expert1258—

Multilingual Not comparable

gpt-oss-20b: 42.4 (#192), Nova Premier 1.0: —

Benchmarkgpt-oss-20bNova Premier 1.0
LMArena Non-English1269—
LMArena Chinese1311—
LMArena German1249—
LMArena Japanese1245—
LMArena Korean1239—
LMArena Russian1279—
LMArena Spanish1267—

Instruction Following Nova Premier 1.0 leads

gpt-oss-20b: 62.0 (#235), Nova Premier 1.0: 66.9 (#201)

Benchmarkgpt-oss-20bNova Premier 1.0
IFEval73.2%80.3%
LMArena Instruction Following1236—

Long Context Not comparable

gpt-oss-20b: 37.9 (#203), Nova Premier 1.0: —

Benchmarkgpt-oss-20bNova Premier 1.0
LMArena Longer Query1251—

Writing & Preference Nova Premier 1.0 leads

gpt-oss-20b: 35.8 (#260), Nova Premier 1.0: 51.0 (#174)

Benchmarkgpt-oss-20bNova Premier 1.0
WildBench73.7%78.8%
LMArena Text1288—
LMArena Creative Writing1201—
EQ-Bench Creative Writing666—
LMArena Multi-Turn1268—

Frequently asked questions

Is gpt-oss-20b better than Nova Premier 1.0?

Nova Premier 1.0 is the stronger model overall, scoring 37.7 to 32.1 on the Noometry Index. gpt-oss-20b costs 139× less per token, which makes it the better buy when Nova Premier 1.0's lead doesn't matter for your workload.

Which is cheaper, gpt-oss-20b or Nova Premier 1.0?

gpt-oss-20b is cheaper. It lists at $0.018 per million input tokens and $0.09 per million output tokens; Nova Premier 1.0 lists at $2.50 and $12.50.

Which has the bigger context window?

Nova Premier 1.0 does, with 1M tokens against 131K.

How many benchmarks do gpt-oss-20b and Nova Premier 1.0 share?

6 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Nova Premier 1.0 has 6.

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