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A side-by-side comparison of Claude Opus 4.5 and gpt-oss-120b, using the lowest price and highest limits found across every provider that offers each model.
| Claude Opus 4.5 | gpt-oss-120b | |
|---|---|---|
| Providers | 42 | 61 |
| Cheapest input ($/M) | $0.7742 via DaoXE | $0 via FastRouter |
| Cheapest output ($/M) | $3.8711 via DaoXE | $0 via FastRouter |
| Max context | 200K | 131.1K |
| Max output | 65.5K | 131.1K |
| Released | Nov 1, 2025 | Jan 1, 2024 |
| Open weights | No | Yes |
| Features | ReasoningToolsStructured outputFilesTemperature | ReasoningToolsStructured outputTemperature |
| Input modalities | FileImageText | Text |
| Output modalities | Text | Text |