Claude Sonnet 4.5
- API model IDs
- claude-sonnet-4-5-20250929claude-sonnet-4-5
- Context window
- 200,000 tokens
- Max output
- 64,000 tokens
- Released
- 2025-09-29
- Lifecycle
- legacy, retires not sooner than 2026-09-29
- License
- proprietary
Lifecycle verified 2026-09-08 (0 days ago). Source
Data handling
- Trains on API data by default
- No
- Retention
- 30 days
- Zero data retention
- on-request
- Residency
- global
- HIPAA BAA
- Available
- SOC 2 / FedRAMP
- SOC 2 yes, FedRAMP none
Anthropic's published certifications list for commercial services names ISO 27001:2022, ISO/IEC 42001:2023, and SOC 2 Type I and Type II. It does not name a FedRAMP authorization for the first-party Claude API. The inference_geo parameter that pins inference to US infrastructure is supported on Claude 4.6 and later models only; requests that set it on this model return a 400 error.
Verified 2026-09-08 (0 days ago). Source 1, Source 2, Source 3, Source 4, Source 5 Subprocessors
Pricing snapshot
$3 input, $15 output, per million tokens. Cached input $0.3 per million tokens. Batch requests are 50% off.
This is a snapshot verified on 2026-09-08, 0 days ago, not a live price. Confirm on the provider’s pricing page before you budget against it.
Where you can call it
- direct · claude-sonnet-4-5-20250929
- bedrock · anthropic.claude-sonnet-4-5-20250929-v1:0 Bedrock InvokeModel integration.
- vertex · claude-sonnet-4-5@20250929
- azure · claude-sonnet-4-5 Microsoft Foundry deployment name.