LLM
Legacy
Proprietary
Claude Sonnet 4.5
Legacy integrations that still need migrating to Sonnet 5.5
Release2025-09-29
Context200K
Max output64,000 tokens
ParametersUndisclosed
Local / VRAMAPI only
LicenseProprietary
Overview
Claude Sonnet 4.5 is a model in the LLM category from Anthropic. It was released in 2025-09-29. The vendor is based in US. Best for: Legacy integrations that still need migrating to Sonnet 5.5.
Notes: Deprecated 2026-09-30; retires 2026-11-30 on the Claude API (replacement: claude-sonnet-5-5). Bedrock and Google Cloud set their own schedules.
Strengths
- Reliable coding model of the 4.x generation
Limits
- Retires 2026-11-30 on the Claude API
- Overtaken by Sonnet 5.5
Specifications
| Vendor | Anthropic |
|---|---|
| Category | LLM |
| Release | 2025-09-29 |
| Status | Legacy |
| License | Proprietary |
| Commercial use | Not specified |
| Context window | 200K |
| Max output tokens | 64,000 |
| Input modalities | Text, Image |
| Output modalities | Text |
| Prompt types | Text |
| Negative prompts | No |
| Max outputs | 1 |
| Local deployment | No |
| API access | Yes |
| Pricing | $3 / $15 per 1M token |
| Confidence | High |
| Vendor country | US |
| Vendor type | Frontier lab |
Pricing & hardware
$3 / $15 per 1M token
API-only: local GPU memory is not applicable. API access is available.