Compare · ModelsLive · 2 picked · head to head
GPT-5 Nano vs gpt-oss-20b
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5 Nano wins on 4/5 benchmarks
GPT-5 Nano wins 4 of 5 shared benchmarks. Leads in knowledge · language · reasoning.
Category leads
knowledge·GPT-5 Nanolanguage·GPT-5 Nanomath·gpt-oss-20breasoning·GPT-5 Nano
Hype vs Reality
Attention vs performance
GPT-5 Nano
#114 by perf·no signal
gpt-oss-20b
#24 by perf·no signal
Best value
gpt-oss-20b
3.9x better value than GPT-5 Nano
GPT-5 Nano
201.3 pts/$
$0.23/M
gpt-oss-20b
792.9 pts/$
$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 Nanogpt-oss-20b
HELM · GPQA
GPT-5 Nano leads by +8.5
GPT-5 Nano
67.9
gpt-oss-20b
59.4
HELM · IFEval
GPT-5 Nano leads by +20.0
GPT-5 Nano
93.2
gpt-oss-20b
73.2
HELM · MMLU-Pro
GPT-5 Nano leads by +3.8
GPT-5 Nano
77.8
gpt-oss-20b
74.0
HELM · Omni-MATH
gpt-oss-20b leads by +1.8
GPT-5 Nano
54.7
gpt-oss-20b
56.5
HELM · WildBench
GPT-5 Nano leads by +6.9
GPT-5 Nano
80.6
gpt-oss-20b
73.7
Full benchmark table
| Benchmark | GPT-5 Nano | gpt-oss-20b |
|---|---|---|
HELM · GPQA | 67.9 | 59.4 |
HELM · IFEval | 93.2 | 73.2 |
HELM · MMLU-Pro | 77.8 | 74.0 |
HELM · Omni-MATH | 54.7 | 56.5 |
HELM · WildBench | 80.6 | 73.7 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $0.05 | $0.40 | 400K tokens (~200 books) | $1.38 | |
| $0.03 | $0.14 | 131K tokens (~66 books) | $0.57 |