Claude Sonnet 4.5

Archived 2026-11-05. The provider shuts it down on 2026-11-30. This page is kept as a record and is left out of live counts and comparisons. The provider names Claude Sonnet 5.5 as the replacement.

API model IDs

claude-sonnet-4-5-20250929

claude-sonnet-4-5

Context window

200,000 tokens

Max output

64,000 tokens

Released

2025-09-29

Lifecycle

archived 2026-11-05, provider shutdown 2026-11-30, replaced by Claude Sonnet 5.5

License

proprietary

Lifecycle verified 2026-11-05 (1 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 (59 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 2026-11-05, 1 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 Deprecated on the first-party Claude API; Anthropic retires it on November 30, 2026, after which requests fail.
• bedrock · anthropic.claude-sonnet-4-5-20250929-v1:0 Bedrock InvokeModel integration. AWS sets its own retirement schedule.
• vertex · claude-sonnet-4-5@20250929 Google Cloud sets its own retirement schedule.
• azure · claude-sonnet-4-5 Microsoft Foundry deployment name. Foundry follows the Claude API retirement date.

Archived on November 5, 2026, ahead of its shutdown. Anthropic deprecated claude-sonnet-4-5-20250929 on September 30, 2026 and retires it on Anthropic-operated platforms on November 30, 2026, naming claude-sonnet-5-5 as the replacement. The model still answers requests until that date, but it is kept here as an archived record and left out of live counts and comparisons. Claude Sonnet 5.5 lists at $2 input and $10 output per million tokens, below this model's $3 and $15.