claude-opus-5-5 appears for the first time in Anthropic's catalog (https://platform.claude.com/docs/en/models/overview.md), listed as standard. A model no catalog has listed before always alerts — the model-floor rule, no model in the loop.
Every field of each cited change, before and after.
| Field | Before | After |
|---|---|---|
| cached_input_per_mtok | ∅ | ∅ |
| context_window | ∅ | 1M tokens |
| currency | ∅ | USD |
| effective_from | ∅ | ∅ |
| effective_until | ∅ | ∅ |
| input_per_mtok | ∅ | 4 |
| model_slug | ∅ | claude-opus-5-5 |
| notes | ∅ | For long-running agentic coding and knowledge work |
| output_per_mtok | ∅ | 20 |
| provider | ∅ | anthropic |
| tier | ∅ | ∅ |
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