Migrate off Claude Sonnet 4
RetiredClaude Sonnet 4 has been retired and shut down on 15 Jun 2026. Anthropic's official replacement is Claude Sonnet 5.5. The cheapest comparable model we track is Ministral 3 3B (Mistral) at $0.1 per 1M tokens blended.
Last verified: 24 Oct 2026 · sourced from official provider documentation
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Claude Sonnet 4 → Claude Sonnet 5.5
Moving to Claude Sonnet 5.5 means 1.5× cheaper ($6 → $4 /1M blended).
| Spec | Claude Sonnet 4 | Claude Sonnet 5.5 |
|---|---|---|
| Status | Retired | GA |
| Blended price /1M | $6 | $4 |
| Input / output /1M | $3 / $15 | $2 / $10 |
| Context window | — | 1M |
| Max output | — | 128.000 |
| Modality | text, image, vision | text, image, vision |
| Knowledge cutoff | — | Jun 2026 |
API string was claude-sonnet-4-20250514 → switch to claude-sonnet-5-5. See Claude Sonnet 5.5's full spec sheet →
Budget-friendly replacements for Claude Sonnet 4
Generally-available models that match Claude Sonnet 4's capabilities, ranked by blended price. Every number is computed from official catalog prices.
| Model | Blended /1M | Input / output | Context |
|---|---|---|---|
| Ministral 3 3B Mistral | $0.1 | $0.1 / $0.1 | — |
| 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 |
Migrating off Claude Sonnet 4
What replaces Claude Sonnet 4?
Anthropic's recommended migration for Claude Sonnet 4 is Claude Sonnet 5.5. The cheapest comparable model in our catalog is Ministral 3 3B (Mistral) at $0.1/1M blended.
Is Claude Sonnet 4 still available?
No — Claude Sonnet 4 has been retired (shut down 15 Jun 2026) and is no longer available via Anthropic's API.
What is the cheapest alternative to Claude Sonnet 4?
Ministral 3 3B (Mistral) is the cheapest generally-available alternative we track that matches Claude Sonnet 4's capabilities, at $0.1 per 1M input and $0.1 per 1M output tokens ($0.1/1M blended).
Browse the full deprecation watch → or see Claude Sonnet 4'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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