This model was retired on 2026-09-29. The pricing below is the last-known rate, kept for migration reference.
Claude Sonnet 4.5 (2025-09-29)Deprecated
VisionTool useReasoningPrompt cachingStructured outputWeb search
Context
200K
Max output
64K
Serving providers
3
Cheapest input
$3.00 /1M
Prices are on-demand list rates. Enterprise commitments (committed-use discounts, provisioned throughput, negotiated rates) can be materially lower.
Benchmarks
independent evaluations · source: ARC PrizeIndividual benchmarks · click a row for effort variants
| Benchmark | Best score | Effort | Cost / task | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ARC-AGI-2 | 14% | reasoning: true · thinking_budget: 32000 | $0.759 | |||||||||||||||||||||||||
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Pricing by serving provider
last-known · per 1M tokens · click a provider to expand| Serving provider | Input /1M | Output /1M | Endpoints | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Anthropic | $3.00 | $15.00 | 1 | ||||||||||||||||||||||||||
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| Amazon Bedrock | $3.00 | $15.00 | 1 | ||||||||||||||||||||||||||
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| Vertex AI | $3.00 | $15.00 | 1 | ||||||||||||||||||||||||||
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Price history
input + output $/1M since we started tracking Input Output
Cost calculator
estimate your monthly spend on this model$1,800
estimated / month
Model IDs
copy the exact identifier for your platformclaude-sonnet-4-5-20250929anthropic.claude-sonnet-4-5-20250929-v1:0vertex_ai/claude-sonnet-4-5@20250929
Frequently asked questions
Claude Sonnet 4.5 (2025-09-29) pricing, context and availabilityIs Claude Sonnet 4.5 (2025-09-29) still available?
Claude Sonnet 4.5 (2025-09-29) was retired on 2026-09-29. The pricing on this page is the last-known rate, kept for migration reference.
How much did Claude Sonnet 4.5 (2025-09-29) cost?
Claude Sonnet 4.5 (2025-09-29)'s last-known pricing, before it was retired on 2026-09-29, was $3.00 per 1M input tokens and $15.00 per 1M output tokens.
What was the context window of Claude Sonnet 4.5 (2025-09-29)?
Claude Sonnet 4.5 (2025-09-29) had a 200K token context window and could return up to 64K output tokens.
What could Claude Sonnet 4.5 (2025-09-29) do?
Claude Sonnet 4.5 (2025-09-29) supported image input (vision), tool use, reasoning, prompt caching, structured output and web search.
Other Anthropic models
compare pricing across the Anthropic lineupClaude Haiku 4.5$1.00/1M · 8 providersClaude Sonnet 4.5$3.00/1M · 8 providersClaude Sonnet 4.6$3.00/1M · 8 providersClaude Sonnet 5$2.00/1M · 7 providersClaude Opus 4.5$5.00/1M · 7 providersClaude Opus 4.6$5.00/1M · 7 providersClaude Opus 4.7$5.00/1M · 7 providersClaude Opus 4.8$5.00/1M · 7 providers
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