- The following models are being deprecated and replaced with newer versions:
- Claude models:
claude-4.0-sonnet→ replaced withclaude-4.6-sonnet
- Gemini models:
gemini-2.0-flash→ replaced withgemini-3.0-flashgemini-2.0-flash-lite→ replaced withgemini-3.1-flash-litegemini-2.5-flash→ replaced withgemini-3.0-flash
- These models are no longer available. On 5/25/2026, they will be automatically migrated to their replacements.
- Claude models:
Detailed Deprecation Guide
Deprecated on 05/25/2026
On 05/25/2026 Retell replaces Claude 4.0 Sonnet with 4.6 Sonnet and migrates Gemini 2.0 Flash, Flash-Lite, and 2.5 Flash to the newer Gemini 3.0 and 3.1 models.