This page may contain stale information. Last updated: 2026-06-12
Overview
claude-opus-4-8 is anthropic’s recommended replacement for retiring Opus 4 snapshots. It replaces both claude-opus-4-20250514 (June 15, 2026) and claude-opus-4-1-20250805 (August 5, 2026).
Migration Mapping
| Retiring | Replacement |
|---|---|
claude-opus-4-20250514 | claude-opus-4-8 |
claude-opus-4-1-20250805 | claude-opus-4-8 |
Alias claude-opus-4-0 | claude-opus-4-8 |
API Parameter Restriction
Claude Opus 4.7 and later (including 4.8) return HTTP 400 when temperature, top_p, or top_k are set to non-default values. Developers must omit these parameters and use prompting for behavioral control (2026-06-12-anthropic-claude-api-june-15-deprecation).