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A side-by-side comparison of Claude Fable 5.1 and GPT-5.6 Luna, using the lowest price and highest limits found across every provider that offers each model.
| Claude Fable 5.1 | GPT-5.6 Luna | |
|---|---|---|
| Providers | 50 | 57 |
| Cheapest input ($/M) | $0.94 via Api.Airforce | $0.036 via UnoRouter |
| Cheapest output ($/M) | $4.71 via Api.Airforce | $0.216 via UnoRouter |
| Max context | 1M | 1.1M |
| Max output | 128K | 128K |
| Released | Aug 28, 2026 | Jun 23, 2026 |
| Open weights | No | No |
| Features | ReasoningToolsStructured outputFiles | ReasoningToolsStructured outputFiles |
| Input modalities | FileImageText | FileImageText |
| Output modalities | Text | Text |