LLMEOL CodeAP Studio

Claude Sonnet 4.5 & 4.6 Deprecation, Shutdown Dates & Migration Guide

Runs locally in your browser — 0 bytes uploaded Synced 2026-11-12 UTC · 7 variants · 4 ecosystems

Track confirmed UTC deprecation and shutdown dates for Claude Sonnet 4.5 & 4.6 (Anthropic) across Anthropic, Google Vertex AI, AWS Bedrock, Azure OpenAI. Preview claude-sonnet-4-5-20250929 → claude-sonnet-5-5 upgrades locally below, audit full configs in the Model Config Auditor, or benchmark token pricing in DevToken.

Tracked Variants 7
Earliest Upcoming EOL 2026-11-30
Recommended Upgrade claude-sonnet-5-5
Ecosystems Covered Anthropic, Google Vertex AI, AWS Bedrock, Azure OpenAI

1. Quick .env & SDK Snippet Replacement Matcher

Edit or paste your .env assignment, LiteLLM route, or SDK model identifier below to check live 3-state EOL status and copy a ready-to-apply replacement diff locally in your browser.

2 of 2 configured models need migration
Full .env Auditor → Compare claude-sonnet-5-5 Cost in DevToken →

Replacement Diff Preview (claude-sonnet-4-5-20250929 → claude-sonnet-5-5)

# ANTHROPIC_MODEL: claude-sonnet-4-5-20250929 -> claude-sonnet-5-5 [DEPRECATED · EOL 2026-11-30]
- ANTHROPIC_MODEL="claude-sonnet-4-5-20250929"
+ ANTHROPIC_MODEL="claude-sonnet-5-5"

# AZURE_OPENAI_DEPLOYMENT: claude-sonnet-4-5 -> claude-sonnet-5-5 [DEPRECATED · EOL 2026-11-30]
- AZURE_OPENAI_DEPLOYMENT="claude-sonnet-4-5"
+ AZURE_OPENAI_DEPLOYMENT="claude-sonnet-5-5"

2. Cross-Ecosystem Claude Sonnet 4.5 & 4.6 Lifecycle Matrix (7)

Direct vendor APIs and cloud platforms retire dated snapshots on independent schedules. Verify the exact model ID, vendor lifecycle stage, and UTC shutdown date matching your deployment.

Claude Sonnet 4.5 & 4.6 lifecycle status, UTC shutdown dates, and replacement models across Anthropic, Google Vertex AI, AWS Bedrock, Azure OpenAI
Model ID Provider Calculated Status Confirmed Shutdown (UTC) Vendor Lifecycle Replacement & Migration Source
claude-sonnet-4-5-20250929 Anthropic DEPRECATED (18d) 2026-11-30in 18d DeprecatedDep: 2026-09-30
claude-sonnet-5-5 Cost → Audit →
Docs ↗
claude-sonnet-4-5 Azure OpenAI DEPRECATED (18d) 2026-11-30in 18d GA
claude-sonnet-5-5 Cost → Audit →
Docs ↗
claude-sonnet-4-5 Google Vertex AIPartner Models DEPRECATED (18d) 2026-11-30in 18d DeprecatedDep: 2026-09-29
claude-sonnet-4-6 Cost → Audit →
Docs ↗
claude-sonnet-4-6 Azure OpenAI DEPRECATED (90d) 2027-02-10in 90d GA
claude-sonnet-5-5 Cost → Audit →
Docs ↗
anthropic.claude-sonnet-4-5-20250929-v1:0 AWS Bedrock(Anthropic) DEPRECATED (147d) 2027-04-08in 147d LegacyDep: 2026-10-08af-south-1, ap-east-2, ap-northeast-1, ap-northeast-2, ap-northeast-3, ap-south-1, ap-south-2, ap-southeast-1, ap-southeast-2, ap-southeast-3, ap-southeast-4, ap-southeast-5, ap-southeast-6, ap-southeast-7, ca-central-1, ca-west-1, eu-central-1, eu-central-2, eu-north-1, eu-south-1, eu-south-2, eu-west-1, eu-west-2, eu-west-3, il-central-1, mx-central-1, sa-east-1, us-east-1, us-east-2, us-gov-east-1, us-gov-west-1, us-west-1, us-west-2
anthropic.claude-sonnet-4-6 Cost → Audit →
Docs ↗
claude-sonnet-4-6 Anthropic ACTIVE No EOL Active — —
anthropic.claude-sonnet-4-6 AWS Bedrock(Anthropic) ACTIVE No EOL Active — —

AWS Bedrock regional scope applies across 33 tracked regions (af-south-1, ap-east-2, ap-northeast-1, ap-northeast-2, ap-northeast-3, ap-south-1); verify regional inference prefixes (us., eu., apac., global.) before cutover.

3. Production Migration Checklist (claude-sonnet-4-5-20250929 → claude-sonnet-5-5)

Follow this deterministic engineering sequence before retiring pinned snapshots in production services and SDK clients:

  1. Inventory pinned model IDs: Search repositories and deployment manifests for ANTHROPIC_MODEL, anthropic/ LiteLLM routes, and dated snapshot strings in the Claude Sonnet 4.5 & 4.6 family (5 deprecated, 0 retired, 2 active variants tracked).
  2. Benchmark successor quality & token pricing: Validate structured output schemas, tool-calling payloads, and latency against claude-sonnet-5-5, then compare input, output, and cached token rates in DevToken.
  3. Enforce keyless CI guardrails: Wire RSS, Atom, iCal feeds & CI Guard into pull-request checks so retired or deprecated Claude Sonnet 4.5 & 4.6 identifiers cannot re-enter production.

Compare sibling model families or inspect full provider-level schedules across every ecosystem hosting this family:

Claude 3 Haiku

DEPRECATED (1d)
Anthropic · 3 tracked IDs · 3 ecosystems Anthropic, Google Vertex AI, AWS Bedrock Upgrade: claude-haiku-4-5-20251001 Earliest EOL: 2026-11-13
Migration Guide → Cost →

5. Claude Sonnet 4.5 & 4.6 Deprecation & Upgrade FAQ

Is Claude Sonnet 4.5 & 4.6 deprecated or retired across Anthropic, Google Vertex AI, AWS Bedrock, Azure OpenAI?

LLMEOL tracks 7 Claude Sonnet 4.5 & 4.6 variants across Anthropic, Google Vertex AI, AWS Bedrock, Azure OpenAI: 5 deprecated with scheduled shutdowns, 0 retired past their UTC EOL date, and 2 active with no announced shutdown date. Check the cross-ecosystem matrix above for exact snapshot dates.

What is the recommended replacement model when migrating off claude-sonnet-4-5-20250929?

The primary recommended upgrade target for claude-sonnet-4-5-20250929 is claude-sonnet-5-5. Always test prompt formatting, max output tokens, and tool schemas on claude-sonnet-5-5, and compare token pricing in DevToken before switching production traffic.

How can I replace claude-sonnet-4-5-20250929 in .env and LiteLLM configs safely?

Paste your ANTHROPIC_MODEL assignment or LiteLLM model block into the Quick Replacement Matcher on this page to generate an exact diff, or open the full Local Model Config Auditor to scan multi-service manifests with zero network upload.