Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 5 vs gpt-oss-20b
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Sonnet 5 wins on 6/6 benchmarks
Claude Sonnet 5 wins 6 of 6 shared benchmarks. Leads in knowledge · general · math.
Category leads
knowledge·Claude Sonnet 5general·Claude Sonnet 5math·Claude Sonnet 5coding·Claude Sonnet 5
Hype vs Reality
Attention vs performance
Claude Sonnet 5
#66 by perf·#10 by attention
gpt-oss-20b
#97 by perf·no signal
Best value
gpt-oss-20b
104.1x better value than Claude Sonnet 5
Claude Sonnet 5
9.5 pts/$
$6.00/M
gpt-oss-20b
983.3 pts/$
$0.05/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
6 benchmarks · 2 models
Claude Sonnet 5gpt-oss-20b
Chess Puzzles
Claude Sonnet 5 leads by +31.6
Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities.
Claude Sonnet 5
31.6
gpt-oss-20b
0.0
Dtbench
Claude Sonnet 5 leads by +40.8
Claude Sonnet 5
87.5
gpt-oss-20b
46.7
GPQA diamond
Claude Sonnet 5 leads by +39.6
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Sonnet 5
87.4
gpt-oss-20b
47.7
Lmca
Claude Sonnet 5 leads by +41.8
Claude Sonnet 5
58.9
gpt-oss-20b
17.1
OTIS Mock AIME 2024-2025
Claude Sonnet 5 leads by +29.5
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Sonnet 5
94.7
gpt-oss-20b
65.2
WeirdML
Claude Sonnet 5 leads by +27.9
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
Claude Sonnet 5
68.8
gpt-oss-20b
40.9
Full benchmark table
| Benchmark | Claude Sonnet 5 | 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. | 31.6 | 0.0 |
Dtbench | 87.5 | 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. | 87.4 | 47.7 |
Lmca | 58.9 | 17.1 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 94.7 | 65.2 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 68.8 | 40.9 |
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 | |
| $0.02 | $0.09 | 131K tokens (~66 books) | $0.36 |