Claude Sonnet 4.5 pricing
Anthropic ·
claude-sonnet-4-5 ·
200K context
Estimate Claude Sonnet 4.5 for your workload Source and check date
Rates last checked against the vendor’s own published pricing on 2026-11-10.
What Claude Sonnet 4.5 costs
| Rate | Per 1M tokens | Per 1K tokens | What it covers |
|---|---|---|---|
| Input | $3 | $0.003 | Every token you send: prompt, history, documents. |
| Output | $15 | $0.015 | Every token the model generates, including hidden reasoning tokens. |
| Cached input | $0.3 | $0.0003 | Input served from the provider’s prompt cache. |
What that means in practice
The same three workloads are costed on every model page, so these numbers are directly comparable across the catalog. No prompt caching and no batch discount is assumed — the figures are what you pay before you optimize anything.
Support chatbot
2,500 six-turn conversations a day
$12,083 / month
$0.161 per conversation · $144,990 a year
An 800-token system prompt, 400-token questions and 900-token answers, over six turns — each turn re-sending everything before it.
Document summarizer
1,000 single-shot summaries a day
$1,458 / month
$0.049 per conversation · $17,496 a year
One 12,000-token document in, an 800-token summary out, no conversation history. The case where input dominates the bill.
Coding agent
200 twelve-turn sessions a day
$8,424 / month
$1.40 per conversation · $101,088 a year
A 3,000-token system prompt, 1,500-token instructions and 2,500-token responses over twelve turns. Long sessions are where the quadratic cost of re-sent history stops being theoretical.
Change the assumptions in the calculator
Cheaper, and scored at least as capable
Every model below costs less on a blended rate and carries a capability score at least as high as Claude Sonnet 4.5’s. The score is a rough estimate, not a benchmark — treat it as a shortlist, not a verdict.
| Model | Input | Output | Blended saving | |
|---|---|---|---|---|
| Claude Sonnet 5.5 | $2 | $10 | 33% | |
| GPT-6.1 Sol | $2 | $10 | 33% | |
| GPT-6 Sol | $2 | $10 | 33% | |
| Kimi K3.1 Pro | $2 | $10 | 33% | |
| GPT-6.1 Terra | $1 | $5 | 67% |
Specification
| Context window | 200K tokens |
|---|---|
| Maximum output | 64K tokens |
| Provider | Anthropic |
| Status | Legacy |
| Reasoning model | Yes |
| Vision | Yes |
| Token counting | Estimated at ~3.6 characters per token (Estimate — Anthropic's tokenizer is server-side; ratio calibrated on English prose) |
Price history
PromptSpend has recorded Claude Sonnet 4.5 since 2026-08-02, and none of its rates has changed in that time. Tracking began on 2026-08-02, so anything the vendor did before then is not on record here.
Every row, with the commit that published it, is in the price-history dataset; price news is also available as an Atom feed.
Where these numbers come from
Last checked against its source on 2026-11-10. Source of record: the vendor’s own published pricing.
The vendor page a human checked
Regional and data-residency premiums, priority tiers, server-side tool fees and negotiated discounts are not included. Prices change without notice; this page is rebuilt every time the catalog does.
Common questions
How much does Claude Sonnet 4.5 cost?
Claude Sonnet 4.5 costs $3 per 1M input tokens and $15 per 1M output tokens at the standard tier, as last checked against the vendor’s own published pricing on 2026-11-10.
How much does Claude Sonnet 4.5 cost to run for a month?
On PromptSpend's three standard workloads, Claude Sonnet 4.5 costs about $12,083 for a support chatbot, $1,458 for a document summarizer and $8,424 for a coding agent each month. No prompt caching and no batch discount is assumed, and the same workloads are costed on every model page, so the figures compare directly.
Is there a cheaper alternative to Claude Sonnet 4.5?
Yes. Claude Sonnet 5.5 ($2 in, $10 out), GPT-6.1 Sol ($2 in, $10 out) and GPT-6 Sol ($2 in, $10 out) cost less on a blended rate and carry a capability score at least as high. The score is a rough estimate, not a benchmark, so treat the list as a shortlist.
How large is the context window of Claude Sonnet 4.5?
Claude Sonnet 4.5 accepts up to 200K tokens of context and can produce up to 64K tokens of output.
Has the price of Claude Sonnet 4.5 changed?
No vendor change is on record. PromptSpend has recorded Claude Sonnet 4.5 since 2026-08-02 and none of its rates has moved. PromptSpend began tracking prices on 2026-08-02, so earlier changes are not on record.
Where do the prices for Claude Sonnet 4.5 come from?
They come from the vendor’s own published pricing and were last checked on 2026-11-10. Regional and data-residency premiums, priority tiers, server-side tool fees and negotiated discounts are not included.