token.app › Compare › gpt-oss-20b (free) vs Claude Sonnet 5

gpt-oss-20b (free) vs Claude Sonnet 5

gpt-oss-20b (free) is free to use, against $4.00 per million tokens. Claude Sonnet 5 accepts the larger context window (1M).

Head to head
Blended price uses a 3:1 input:output mix
gpt-oss-20b (free)Claude Sonnet 5
ProviderOpenAIAnthropic
Input $/1MFree$2.00
Output $/1MFree$10.00
Blended $/1MFree$4.00
Context window131K1M
Max output33K128K
ReleasedAug 2025Jun 2026
LicenceOpen weightsProprietary
Choose gpt-oss-20b (free) if…
  • Costs less per token — Free vs $4.00 blended
  • Open weights — self-hostable
Choose Claude Sonnet 5 if…
  • Larger context window (1M)
  • Newer model (released Jun 2026)
FAQ
Which is better, gpt-oss-20b (free) or Claude Sonnet 5?
We do not hold independently-run benchmark scores covering both gpt-oss-20b (free) and Claude Sonnet 5, so we make no quality claim. Their pricing and specifications are compared on this page.
Is gpt-oss-20b (free) cheaper than Claude Sonnet 5?
gpt-oss-20b (free) is cheaper: Free versus $4.00 per million tokens blended at 3:1 input:output. Input alone: Free vs $2.00. Output alone: Free vs $10.00.
What context windows do gpt-oss-20b (free) and Claude Sonnet 5 have?
gpt-oss-20b (free): 131,072 tokens. Claude Sonnet 5: 1,000,000 tokens.
Who makes gpt-oss-20b (free) and Claude Sonnet 5?
gpt-oss-20b (free) is made by OpenAI. Claude Sonnet 5 is made by Anthropic.
Related comparisons
gpt-oss-20b (free) full details Claude Sonnet 5 full details gpt-oss-20b (free) vs Ling 3.0 Tiny (free) gpt-oss-20b (free) vs Muse Spark 1.2 gpt-oss-20b (free) vs Qwen3.8 Max gpt-oss-20b (free) vs DeepSeek V4 Flash Latest gpt-oss-20b (free) vs DeepSeek V4 Flash 0731 gpt-oss-20b (free) vs Inkling Small