Claude Fable 5.1 is 1.5× cheaper per million tokens (blended). Claude Fable 5.1 has the larger context window (1,000,000 vs 200,000 tokens, 5.0×).
Claude Fable 5.1 vs Claude Opus 4.1
Live catalog fields. Best-in-row is highlighted.
Claude Fable 5.1
Anthropic · anthropic__claude-fable-5.1
Claude Opus 4.1
Anthropic · anthropic__claude-opus-4.1
Identity
| Field | anthropic__claude-fable-5.1 | anthropic__claude-opus-4.1 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Slug | anthropic__claude-fable-5.1 | anthropic__claude-opus-4.1 |
| Status | live | live |
| Open weights | No | No |
| License | — | — |
| HuggingFace | — | — |
Quality
| Field | anthropic__claude-fable-5.1 | anthropic__claude-opus-4.1 |
|---|---|---|
| Quality index (0–100) | — | — |
Cost
| Field | anthropic__claude-fable-5.1 | anthropic__claude-opus-4.1 |
|---|---|---|
| Input $ / 1M tokens | $10.00 | $15.00 |
| Cached input $ / 1M | $0.25 | $1.50 |
| Output $ / 1M tokens | $50.00 | $75.00 |
Context
| Field | anthropic__claude-fable-5.1 | anthropic__claude-opus-4.1 |
|---|---|---|
| Max context tokens | 1,000,000 | 200,000 |
| Max output tokens | 128,000 | 32,000 |
Modalities
| Field | anthropic__claude-fable-5.1 | anthropic__claude-opus-4.1 |
|---|---|---|
| Input | text, image, file | image, text, file |
| Output | text | text |