Is Claude Sonnet 4.5 deprecated?
Anthropic · lifecycle status verified against the provider's own page.
Last verified pricing
historical reference — not a buy recommendationClaude Sonnet 4.5 was last priced at $3.00 per 1M input tokens and $15.00 per 1M output tokens, with a 200K-token context window. Its benchmark average was 75.1 on the blend we track. Full history stays on the Claude Sonnet 4.5 model page.
What replaced Claude Sonnet 4.5?
successor named by AnthropicAnthropic's named successorfrom the deprecation notice — not our inference
| Model | Input $/M | Output $/M | Context | |
|---|---|---|---|---|
| Claude Sonnet 4.5 Deprecated | $3.00 | $15.00 | 200K | |
| Claude Sonnet 5.5 | $2.00 | $10.00 | 1M | details → |
Same benchmark score or better, for less
computed from live prices + benchmark averagesCheaper equivalentsscore ≥ 75.1 on the benchmark blend, ranked by blended cost ((3×input + 1×output) ÷ 4)
| Model | Benchmark | Blended $/M | Input $/M | Output $/M | |
|---|---|---|---|---|---|
| Claude Sonnet 4.5 Deprecated | 75.1 | $6.00 | $3.00 | $15.00 | |
| DeepSeek V4 Flash DeepInfra cheapest | 77.5 | $0.090 | $0.060 | $0.180 | details → |
"Equivalent" here means the model's benchmark average is at or above Claude Sonnet 4.5's 75.1. Benchmarks compress real quality differences — validate on your own workload before switching. Model your exact token mix in the migration calculator.
Current Anthropic alternatives
same provider, sold today — no parity claim| Model | Input $/M | Output $/M | Context | |
|---|---|---|---|---|
| Claude Sonnet 5 | $2.00 | $10.00 | 1M | details → |
| Claude Sonnet 5.5 | $2.00 | $10.00 | 1M | details → |
| Claude Sonnet 4.6 | $3.00 | $15.00 | 1M | details → |
Migrating off Claude Sonnet 4.5? The migration calculator compares your exact input/output token mix against every current model we track, with benchmark tradeoffs. Lifecycle data on this page comes from Anthropic's own page and was last re-verified on . See all retired & deprecated models.