A rate per million tokens is not a budget. The calculator takes your request volume, prompt size and cache hit rate and gives you a monthly figure.
Claude Sonnet 4.5 API pricing (October 2026)
Anthropic retires Claude Sonnet 4.5 on 30 Nov 2026; the named replacement is Claude Sonnet 5.5.
What it costs at real volumes
A chat-shaped workload: 800 input tokens and 300 output tokens per request, no caching, no batch.
Specifications
- Provider
- Anthropic Claude
- Context window
- 200K tokens
- Max output
- 64K tokens
- Tier
- Workhorse
- Status
- Retires on 30 Nov 2026, replacement Claude Sonnet 5.5
- Blended $/1M (3:1)
- $6.00
- Cache break-even, caching each turn
- 22%
- Prices verified
- 30 Oct 2026
Source: Anthropic Claude pricing. Finitizer is not affiliated with Anthropic Claude.
Similar models
Other Claude models
- Claude Fable 5.1+$14.00
- Claude Opus 5.5+$2.00
- Claude Sonnet 5.5-$2.00
- Claude Haiku 5.5-$5.80
- Claude Opus 5+$4.00
- Claude Sonnet 5-$2.00
- Claude Opus 4.1+$24.00
- Claude Haiku 4.5-$4.00
- Claude Haiku 3.5-$4.40
Closest prices elsewhere
- Amazon Nova Premier-$1.00
- GPT-5.6 Terra-$1.50
- Gemini 3.1 Pro Preview-$1.50
- GPT-6.1 Sol-$2.00
Frequently asked questions
How much does Claude Sonnet 4.5 cost per 1M tokens?
Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens at Anthropic Claude list prices. Output is 5.0x the input rate, so the input:output ratio of a workload drives the real cost more than the headline price.
Does Claude Sonnet 4.5 support prompt caching?
Yes. Cached input is billed at $0.300 per million tokens, 10x cheaper than uncached input. Cache writes carry a premium, so caching that writes every turn (chat history, agent steps) only pays above roughly a 22% hit rate. A shared prompt reused within a few minutes pays at almost any hit rate.
What is the batch discount for Claude Sonnet 4.5?
Requests submitted through the asynchronous batch endpoint are billed at 50% off both input and output rates, bringing input to $1.50 and output to $7.50 per million tokens.
What is Claude Sonnet 4.5's context window?
200K tokens of context with up to 64K output tokens per request. A larger context window raises the ceiling on what you can send, not the price per token, but filling it on every request is one of the most common causes of an unexpected bill.
Running Claude Sonnet 4.5 in production?
Finitizer Tokenomics reads what this model actually costs you from your own bills and exports, shows which workload, team or API key is spending it, flags a spike or a new spend source the day your data shows it, and forecasts where the month will land.
See Finitizer Tokenomics