Claude Sonnet 5.5 is 2.5× cheaper per million tokens (blended). Claude Sonnet 5.5 leads quality index by 15.4 points (93.2 vs 77.8). Claude Sonnet 5.5 has the larger context window (1,000,000 vs 200,000 tokens, 5.0×).
Claude Opus 4.5 vs Claude Sonnet 5.5
Live catalog fields. Best-in-row is highlighted.
Claude Opus 4.5
Anthropic · anthropic__claude-opus-4.5
Claude Sonnet 5.5
Anthropic · anthropic__claude-sonnet-5.5
Identity
| Field | anthropic__claude-opus-4.5 | anthropic__claude-sonnet-5.5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Slug | anthropic__claude-opus-4.5 | anthropic__claude-sonnet-5.5 |
| Status | live | live |
| Open weights | No | No |
| License | — | — |
| HuggingFace | — | — |
Quality
| Field | anthropic__claude-opus-4.5 | anthropic__claude-sonnet-5.5 |
|---|---|---|
| Quality index (0–100) | 77.8 | 93.2 |
Cost
| Field | anthropic__claude-opus-4.5 | anthropic__claude-sonnet-5.5 |
|---|---|---|
| Input $ / 1M tokens | $5.00 | $2.00 |
| Cached input $ / 1M | $0.50 | $0.20 |
| Output $ / 1M tokens | $25.00 | $10.00 |
Context
| Field | anthropic__claude-opus-4.5 | anthropic__claude-sonnet-5.5 |
|---|---|---|
| Max context tokens | 200,000 | 1,000,000 |
| Max output tokens | 64,000 | 128,000 |
Modalities
| Field | anthropic__claude-opus-4.5 | anthropic__claude-sonnet-5.5 |
|---|---|---|
| Input | file, image, text | text, image, file |
| Output | text | text |