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 5/5 benchmarks
GPT-5 Mini wins 5 of 5 shared benchmarks. Leads in knowledge · language · math.
Category leads
knowledge·GPT-5 Minilanguage·GPT-5 Minimath·GPT-5 Minireasoning·GPT-5 Mini
Hype vs Reality
Attention vs performance
GPT-5 Mini
#63 by perf·no signal
gpt-oss-20b
#22 by perf·no signal
Best value
gpt-oss-20b
15.9x better value than GPT-5 Mini
GPT-5 Mini
49.8 pts/$
$1.13/M
gpt-oss-20b
792.9 pts/$
$0.09/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
5 benchmarks · 2 models
GPT-5 Minigpt-oss-20b
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
Full benchmark table
| Benchmark | GPT-5 Mini | gpt-oss-20b |
|---|---|---|
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 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| GPT-5 Mini | $0.25 | $2.00 | 400K tokens (~200 books) | $6.88 |
| gpt-oss-20b | $0.03 | $0.14 | 131K tokens (~66 books) | $0.57 |