Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 5.5 vs gpt-oss-20b (free)
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Sonnet 5.5 wins on 1/1 benchmarks
Claude Sonnet 5.5 wins 1 of 1 shared benchmarks. Leads in speed.
Category leads
speed·Claude Sonnet 5.5
Hype vs Reality
Attention vs performance
Claude Sonnet 5.5
#34 by perf·#12 by attention
gpt-oss-20b (free)
#33 by perf·no signal
Best value
Claude Sonnet 5.5
Claude Sonnet 5.5
11.0 pts/$
$6.00/M
gpt-oss-20b (free)
n/a
$0.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
1 benchmark · 2 models
Claude Sonnet 5.5gpt-oss-20b (free)
Artificial Analysis · Quality Index
Claude Sonnet 5.5 leads by +41.1
Claude Sonnet 5.5
56.0
gpt-oss-20b (free)
14.9
Full benchmark table
| Benchmark | Claude Sonnet 5.5 | gpt-oss-20b (free) |
|---|---|---|
Artificial Analysis · Quality Index | 56.0 | 14.9 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $2.00 | $10.00 | 1.0M tokens (~500 books) | $40.00 | |
| $0.00 | $0.00 | 131K tokens (~66 books) | — |
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