Detailed comparison of capabilities, features, and performance.
| Feature | gpt-oss-20b | Claude 4.5 Sonnet (thinking) |
|---|---|---|
| AI Lab | OpenAI | Anthropic |
| Context Size | 128,000 tokens | 1,000,000 tokens |
| Max Output Size | 16,384 tokens | 64,000 tokens |
| Frontier Model | No | Yes |
| Vision Support | No | Yes |
| Description | OpenAI's smaller open-weight model for powerful reasoning and agentic tasks. | The latest Claude 4.5 Sonnet model from Anthropic with maximum reasoning enabled, 200k reasoning tokens in 1M context. |
View detailed specifications and capabilities
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