Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 4.5 vs gpt-oss-20b (free)
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
gpt-oss-20b (free) wins on 0/0 benchmarks
Not enough overlapping benchmarks to declare a winner yet · Claude Sonnet 4.5 · gpt-oss-20b (free) are still filling in scores.
Hype vs Reality
Attention vs performance
Claude Sonnet 4.5
#130 by perf·no signal
gpt-oss-20b (free)
#25 by perf·no signal
Best value
Claude Sonnet 4.5
Claude Sonnet 4.5
4.7 pts/$
$9.00/M
gpt-oss-20b (free)
—
$0.00/M
Vendor risk
Who is behind the model
Anthropic
$380.0B·Tier 1
OpenAI
$840.0B·Tier 1
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| Claude Sonnet 4.5 | $3.00 | $15.00 | 1.0M tokens (~500 books) | $60.00 |
| gpt-oss-20b (free) | $0.00 | $0.00 | 131K tokens (~66 books) | — |