Migrate off Claude Sonnet 4.5
DeprecatedClaude Sonnet 4.5 is deprecated and shuts down on 30 Nov 2026. Anthropic's official replacement is Claude Sonnet 5.5. The cheapest comparable model we track is Amazon Nova Lite (Amazon) at $0.105 per 1M tokens blended.
Last verified: 24 Oct 2026 · sourced from official provider documentation
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Claude Sonnet 4.5 → Claude Sonnet 5.5
Moving to Claude Sonnet 5.5 means 1.5× cheaper ($6 → $4 /1M blended) and a larger context window (200K → 1M).
| Spec | Claude Sonnet 4.5 | Claude Sonnet 5.5 |
|---|---|---|
| Status | Deprecated | GA |
| Blended price /1M | $6 | $4 |
| Input / output /1M | $3 / $15 | $2 / $10 |
| Context window | 200K | 1M |
| Max output | 64.000 | 128.000 |
| Modality | text, image, vision | text, image, vision |
| Knowledge cutoff | Jan 2025 | Jun 2026 |
API string was claude-sonnet-4-5-20250929 → switch to claude-sonnet-5-5. See Claude Sonnet 5.5's full spec sheet →
Budget-friendly replacements for Claude Sonnet 4.5
Generally-available models that match Claude Sonnet 4.5's capabilities (and at least half its 200K context), ranked by blended price. Every number is computed from official catalog prices.
| Model | Blended /1M | Input / output | Context |
|---|---|---|---|
| Amazon Nova Lite Amazon | $0.105 | $0.06 / $0.24 | 300K |
| Llama 4 Scout (17B-16E Instruct) Meta | $0.15 | $0.1 / $0.3 | 10M |
| Ministral 3 8B Mistral | $0.15 | $0.15 / $0.15 | 256K |
Migrating off Claude Sonnet 4.5
What replaces Claude Sonnet 4.5?
Anthropic's recommended migration for Claude Sonnet 4.5 is Claude Sonnet 5.5. The cheapest comparable model in our catalog is Amazon Nova Lite (Amazon) at $0.105/1M blended.
When is Claude Sonnet 4.5 shut down?
Claude Sonnet 4.5 is deprecated and scheduled to shut down on 30 Nov 2026 (deprecated 30 Sep 2026). Migrate before that date to avoid a 404.
What is the cheapest alternative to Claude Sonnet 4.5?
Amazon Nova Lite (Amazon) is the cheapest generally-available alternative we track that matches Claude Sonnet 4.5's capabilities, at $0.06 per 1M input and $0.24 per 1M output tokens ($0.105/1M blended).
Browse the full deprecation watch → or see Claude Sonnet 4.5's full spec sheet →
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The last few changes we caught — this is what lands in your inbox:
- RetiringO4-mini is off - OpenAI shut it down on October 23, 2026, as scheduled; migrate to gpt-5.6-terra
- RetiringO3-mini is off - OpenAI shut it down on October 23, 2026, as scheduled; migrate to gpt-5.6-sol
- RetiringO1-pro is off - OpenAI shut it down on October 23, 2026, as scheduled; migrate to gpt-5.6-sol
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