Claude Sonnet 4.5 vs GPT OSS 120B
GPT OSS 120B is cheaper on output tokens, while Claude Sonnet 4.5 offers a larger context window. Choose Claude Sonnet 4.5 or GPT OSS 120B based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 4.5 | GPT OSS 120B |
|---|---|---|
| Provider | Anthropic | Neon |
| Input / 1M tokens | $3.00 | $0.15 |
| Output / 1M tokens | $15.00 | $0.60 |
| Context window | 1M | 131K |
| Parameters | — | 117B |
| Open weights | No | Yes |
| Released | Sep 2025 | Aug 2025 |
| LiveBench score | 67.9 | 46.4 |
| SWE-bench Verified score | 74.8 | — |
| SWE-bench Multilingual score | 67.0 | — |
| LMArena (Chatbot Arena) Elo score | 1438 | — |
| LMArena WebDev Elo score | 1393 | — |
| GPQA Diamond score | 82.3 | — |
| FrontierMath score | 15.2 | — |
| Epoch Capabilities Index score | 147 | — |
| Aider Polyglot score | — | 41.8 |
FAQ
Is Claude Sonnet 4.5 or GPT OSS 120B cheaper?
GPT OSS 120B is cheaper on output tokens ($0.60 vs $15.00 per 1M).
Which has the larger context window, Claude Sonnet 4.5 or GPT OSS 120B?
Claude Sonnet 4.5 has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.