Compare · ModelsLive · 2 picked · head to head
GPT-5 Mini vs gpt-oss-20b
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5 Mini wins on 12/12 benchmarks
GPT-5 Mini wins 12 of 12 shared benchmarks. Leads in knowledge · general · language.
Category leads
knowledge·GPT-5 Minigeneral·GPT-5 Minilanguage·GPT-5 Minimath·GPT-5 Minireasoning·GPT-5 Minicoding·GPT-5 Mini
Hype vs Reality
Attention vs performance
GPT-5 Mini
#120 by perf·#9 by attention
gpt-oss-20b
#106 by perf·no signal
Best value
gpt-oss-20b
14.5x better value than GPT-5 Mini
GPT-5 Mini
45.8 pts/$
$1.13/M
gpt-oss-20b
665.0 pts/$
$0.08/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
12 benchmarks · 2 models
GPT-5 Minigpt-oss-20b
Chess Puzzles
GPT-5 Mini leads by +20.0
Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities.
GPT-5 Mini
20.0
gpt-oss-20b
0.0
Dtbench
GPT-5 Mini leads by +20.9
GPT-5 Mini
67.5
gpt-oss-20b
46.7
GPQA diamond
GPT-5 Mini leads by +19.7
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
GPT-5 Mini
69.4
gpt-oss-20b
49.7
HELM · GPQA
GPT-5 Mini leads by +16.2
GPT-5 Mini
75.6
gpt-oss-20b
59.4
HELM · IFEval
GPT-5 Mini leads by +19.5
GPT-5 Mini
92.7
gpt-oss-20b
73.2
HELM · MMLU-Pro
GPT-5 Mini leads by +9.5
GPT-5 Mini
83.5
gpt-oss-20b
74.0
HELM · Omni-MATH
GPT-5 Mini leads by +15.7
GPT-5 Mini
72.2
gpt-oss-20b
56.5
HELM · WildBench
GPT-5 Mini leads by +11.8
GPT-5 Mini
85.5
gpt-oss-20b
73.7
Lmca
GPT-5 Mini leads by +23.2
GPT-5 Mini
40.2
gpt-oss-20b
17.1
OTIS Mock AIME 2024-2025
GPT-5 Mini leads by +21.4
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
GPT-5 Mini
86.7
gpt-oss-20b
65.2
Terminal Bench
GPT-5 Mini leads by +31.4
Terminal-Bench 2.0 · evaluates AI agents on real terminal-based coding tasks · writing scripts, debugging, running tests, and managing projects entirely through command-line interaction. Tests both code quality and terminal fluency.
GPT-5 Mini
34.8
gpt-oss-20b
3.4
WeirdML
GPT-5 Mini leads by +11.7
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
GPT-5 Mini
52.7
gpt-oss-20b
40.9
Full benchmark table
| Benchmark | GPT-5 Mini | gpt-oss-20b |
|---|---|---|
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 20.0 | 0.0 |
Dtbench | 67.5 | 46.7 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 69.4 | 49.7 |
HELM · GPQA | 75.6 | 59.4 |
HELM · IFEval | 92.7 | 73.2 |
HELM · MMLU-Pro | 83.5 | 74.0 |
HELM · Omni-MATH | 72.2 | 56.5 |
HELM · WildBench | 85.5 | 73.7 |
Lmca | 40.2 | 17.1 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 86.7 | 65.2 |
Terminal Bench Terminal-Bench 2.0 · evaluates AI agents on real terminal-based coding tasks · writing scripts, debugging, running tests, and managing projects entirely through command-line interaction. Tests both code quality and terminal fluency. | 34.8 | 3.4 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 52.7 | 40.9 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $0.25 | $2.00 | 400K tokens (~200 books) | $6.88 | |
| $0.03 | $0.13 | 131K tokens (~66 books) | $0.55 |