gpt-oss-20b launch post cover

Cost/1M tokens

input
$0.03
cached
$0.03
output
$0.13
Context
131Ktokens
Released
1y ago
Size
20Bparameters

Benchmarks

DeepSWE is the primary coding benchmark where an exact model evaluation exists. Arena leaderboards and other sourced evaluations appear below; missing scores are not zero.

How it ranks

Against its predecessor, similarly priced models and the models ranked around it.

DeepSWE 1.1

Best pass@1 per model · Higher is better

Not evaluated in DeepSWE 1.1

Arena Text

Best Arena rating per model · Higher is better

Arena #271

  1. 1474
    GLM 5.3 FlashSimilar price
  2. 1318
  3. 1318
  4. 1318
    gpt-oss-20b
  5. 1317
    Gemma 3n E4B ITNearby rank
  6. 1314
  7. 1303
    Gemma 3 4BSimilar price
  8. 1274
    Mistral Small 3Similar price
  9. 1241
    Nova Micro 1.0Similar price

Ahead of 2 of 4 similarly priced models

Arena WebDev

Best Arena rating per model · Higher is better

Not ranked on Arena WebDev yet

Arena Search

Best Arena rating per model · Higher is better

Not ranked on Arena Search yet

Agent Arena

Best IPS score per model · Higher is better

Not ranked on Agent Arena yet

GPQA diamond

Best score per model · Higher is better

#121 of 161

  1. 90.2%
    GLM 5.3 FlashSimilar price
  2. 82.3%
    Qwen3.7 FlashSimilar price
  3. 63.8%
    Qwen3 14BNearby rank
  4. 61.7%
    Qwen3 30B A3BNearby rank
  5. 60.8%
    gpt-oss-20b
  6. 60.5%
    GLM 4.7 FlashNearby rank
  7. 59.5%
    Mistral Medium 3Nearby rank
  8. 23.9%
  9. 23.2%
    Gemma 3 4BSimilar price

Ahead of 2 of 4 similarly priced models

OTIS Mock AIME 2024-2025

Best score per model · Higher is better

#108 of 158

  1. 93.9%
    GLM 5.3 FlashSimilar price
  2. 86.7%
    Qwen3.7 FlashSimilar price
  3. 66.4%
    R1 0528Nearby rank
  4. 66.4%
    Qwen3 14BNearby rank
  5. 65.3%
    gpt-oss-20b
  6. 64.4%
    Claude Opus 4Nearby rank
  7. 62.8%
    Qwen3 30B A3BNearby rank
  8. 7.5%
    Gemma 3 4BSimilar price
  9. 0.6%

Ahead of 2 of 4 similarly priced models

Terminal Bench

Best score per model · Higher is better

#49 of 49

  1. 17.1%
    Gemini 2.5 FlashNearby rank
  2. 9.2%
    Qwen3.5-9BSimilar price
  3. 3.4%
    gpt-oss-20b

Ahead of 0 of 1 similarly priced model

Not evaluated in DeepSWE 1.1 as of 2026-09-22. Results are only shown for exact model versions in the official dataset. Official leaderboard.

Reasoning effort

GPQA diamond

Score by reasoning effort · Higher is better

OTIS Mock AIME 2024-2025

Score by reasoning effort · Higher is better

All published scores

Benchmark compilation: Epoch AI, Capabilities & benchmarking (CC BY attribution). Scores are converted to percentages and model names matched to the Vertical Tabs catalog. Individual evaluations are credited to their original sources. External results may carry separate licences and evaluation configurations; do not interpret scores from different harnesses as directly comparable.

Arena ratings: Arena (lmarena-ai/leaderboard-dataset), licensed CC BY 4.0. Ratings come from pairwise human votes and are only comparable within one leaderboard; the interval is Arena's 95% confidence interval. Model names are matched to the Vertical Tabs catalog.

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