Claude Opus 4

Model at Anthropic

Claude Opus 4 does not have a researched profile yet. Everything here comes from its recorded changes and public listings, each linked to its source.

The basics

As of Nov 1

Retired

Requests to claude-sonnet-4-20250514 and claude-opus-4-20250514 on the Claude API now return an error.

Action needed:: Switch to Claude Sonnet 4.6 or newer and Claude Opus 4.8 or newer.

Retiring

Anthropic announced that claude-sonnet-4-20250514 and claude-opus-4-20250514 would retire on the Claude API on June 15, 2026.

Flagship model at Anthropic

$4 in, $20 out

$5 in, $25 out

$5 in, $25 out

Similar models for now. Real viewing data comes after launch.

Higher is better. Green is Claude Opus 4. Dark marks are similar models.

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Slop score

17.4

Overused AI words and phrases. Less slop than 38% of tracked models.

Repetition

Repeated words and ideas. Less repetition than 42% of tracked models.

Story length

5,774

Average characters per story. Longer than 12% of tracked models.