Claude Opus 4 Model Update

Anthropic updated the Claude Opus 4 model documentation, changing class names and removing specific model IDs.

Apr 27, 2026

At a glance

Decide impact, cost movement, and the next step before reading the full diff.

Affected

Anthropic · claude-opus-4

API Breaking

Cost impact

Low · 0/5

Estimated from pricing and window changes

Migration pressure

Medium · 2/5

No explicit deadline yet

Next step

Keep monitoring the official rollout

Do this first, then review field-level details

Impact summary

Use explicit levels instead of abstract charts to judge this change.

Cost

Low

Score 0/50%

Quality

Low

Score 0/50%

Migration

Medium

Score 2/540%

Reliability

Low

Score 0/50%

Compliance

Low

Score 0/50%

The changes may require updates to code that interacts with the Claude Opus 4 model.

Changes

Review changed fields first, then decide whether you need full before/after values.

Before

self.__next_f.push([1,"3a:[\"$\",\"tr\",null,{\"className\":\"border-b-0.5 border-border-400 last:border-b-0\",\"children\":[[\"$\",\"td\",null,{\"className\":\"p-2 first:pl-0 last:pr-0 text-text-200\",\"children\":[\"$\",\"strong\",null,{\"className\":\"font-semibold\",\"children\":\"GCP Vertex AI ID\"}]}],[\"$\",\"td\",null,{\"className\":\"p-2 first:pl-0 last:pr-0 text-text-200\",\"children\":[\"$\",\"$L36\",null,{\"id\":\"claude-opus-4-7\"}]}],[\"$\",\"td\",null,{\"className\":\"p-2 first:pl-0 last:pr-0 text-text-200\",\"children\":[\"$\",\"$L36\",null,{\"id\":\"claude-sonnet-4-6\

After

self.__next_f.push([1,"3a:[\"$\",\"tr\",null,{\"className\":\"border-b-0.5 border-border-400 last:border-b-0\",\"children\":[[\"$\",\"td\",null,{\"className\":\"p-2 first:pl-0 last:pr-0 text-text-200\",\"children\":[\"$\

Sources

Each source focuses on what it confirms, without repeating the whole article.

docs

Anthropic Models Docs

self.__next_f.push([1,"3a:[\"$\",\"tr\",null,{\"className\":\"border-b-0.5 border-border-400 last:border-b-0\",\"children\":[[\"$\",\"td\",null,{\"className\":\"p-2 first:pl-0 last:pr-0 text-text-2...

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