Guides / claude haiku 4.5 pricing
Claude Haiku 4.5 pricing at a million calls a month
Claude Haiku 4.5 pricing is $1.00 per million input tokens and $5.00 per million output tokens, with cached reads at $0.10 per million. It runs at call volumes where a small per-call regression becomes a large monthly number. Culpa, a local-first LLM cost, margin, and forecast ledger, meters every call so a high-volume tier can't drift unnoticed.
Why this happens
Haiku sits at the high-frequency end of the roster, handling classification, routing and the cheap first pass in a two-model chain. That volume changes which mistakes matter. A hundred extra prompt tokens is irrelevant on a frontier model at low volume and a four-figure monthly line here. The cached rate is a tenfold discount, which is the largest proportional saving available anywhere in this price book.
What this usually looks like
- Haiku carries most of your call count and a surprising share of your spend.
- Cached-token share is near zero, which at this volume is the most expensive miss you can make.
- Nobody reviews the Haiku prompt because the per-call cost rounds to nothing.
- A two-model chain sends more to Haiku than the expensive model it was meant to protect.
Free, no card, no account
Run the free Cost Leak Scan
It shows your most expensive conversation before you install anything.
Mistakes that cost the most
| Mistake | Why it hurts | Do instead |
|---|---|---|
| Leaving the cached rate unused at high call volume. | The cached rate is a tenth of input, so at millions of calls the untaken discount is the largest line you can recover. | Move the stable block to the front of the prompt and check the cached share weekly. |
| Rebuilding the cache more often than you read it. | The five-minute cache write bills at $1.25 per million, above the $1.00 input rate. | Track writes against reads. A five-minute cache clears break-even on the first read, so only a cache rebuilt without ever being read loses money. |
| Skipping prompt review because the rate is low. | At a million calls, every thousand prompt tokens is $1,000 a month. | Price the prompt explicitly: calls times tokens times $1.00 per million. Then decide if it earns its length. |
Run this check tonight
- Multiply your monthly Haiku call count by prompt tokens by $1.00 per million. That's your fixed prompt cost.
- Divide cached input tokens by total input tokens. At this volume, a low hit rate is your biggest single loss.
- Count cache writes against reads. More writes than reads means the cache is costing you.
- Check what share of Haiku output is boilerplate you could have templated outside the model.
- Confirm Haiku is handling mechanical work rather than work it fails at and escalates.
One million calls, cached and uncached
Illustrative example
A classification step running 1 million calls a month with a 4,000-token system prompt and 80 tokens of output. Rates from the price book: $1.00 input, $5.00 output, $0.10 cached read, $1.25 five-minute cache write.
$2,880 a month sits in the difference between a working cache and a broken one, on a model everyone describes as cheap. The output side is under a tenth of the bill.
Every number, with its confidence and source
| Figure | What it means | Confidence | Source |
|---|---|---|---|
| $1.00 / $5.00 per million | Claude Haiku 4.5 input and output rates | calculated | Culpa price book row for anthropic/claude-haiku-4-5, $0.001 and $0.005 per 1k, effective 2026-07-02, verified against Anthropic pricing. |
| 10x | cost of uncached input against the cached rate on Haiku 4.5 | calculated | $1.00 input divided by the $0.10 cached rate, from the same price-book row. |
| $1,520 to $4,400 | modelled monthly cost of a one-million-call classification step, cached versus uncached | estimated | Both endpoints from the teardown arithmetic at real Haiku 4.5 rates. A range because call volume and prompt size are modelled. |
What a generic answer can’t know
A rate card can't tell you that 91% of your Haiku input is a system prompt, or that your cached share collapsed after a deploy edited it. That needs prompt structure compared across calls. Culpa reads it on your infrastructure, keeps your prompts and responses there, and counts the calls to run your plan.
Questions founders ask next
How much does Claude Haiku 4.5 cost?
$1.00 per million input tokens and $5.00 per million output, verified 2026-07-02 against Anthropic's pricing page. Cached reads are $0.10 per million, a tenfold discount that matters more here than on any other tier because of the call volume.
Is the dated Haiku model a different price?
No. The dated alias in this price book bills at exactly the same rates as the base model, so pinning the dated version costs nothing and changes nothing about your bill.
Why does caching matter so much on Haiku?
Because the discount is proportionally the same as elsewhere but the call volume is far higher. A tenfold saving on four thousand repeated tokens across a million calls is thousands of dollars a month, from one change to prompt ordering.
On your infrastructure
Culpa runs on your infrastructure. Your prompts and responses never leave it. Culpa counts calls to run your plan, and it fails open, so if it ever breaks your app keeps running.
How Culpa works
Find the culprit. Not just the total.
Your dashboard shows what you spent. It stops short of who spent it. Culpa shows the conversation, the user and the feature behind it.
Your prompts stay local.
Culpa runs on your own infrastructure. What you send to a model reaches us at no point.
Every dollar has a name.
Follow any charge to the conversation, the user, the feature and the customer behind it.
See the bill before it lands.
Cost your next feature before you ship it. You get the likely bill and the worst case, at best, median, p90 and p99.
Three steps to your first answer.
Change one base URL.
Or drop in the Python or TypeScript library.
Find your most expensive conversation.
In the first session, not the first week.
Cost your next feature before you ship it.
Why the bill went up
Example dashboardCalls traced
418,209
across 3 projects
Spend this week
$378.41
+ $182 vs last week
Failed calls
312
74% retried, and you paid for all of them
+ $182 this week traced to one culprit
Spend over 14 days
Most expensive users
Next week forecast
Graded against reality. Accuracy shown as results land.
Keep reading
Sources: Anthropic pricing. Last reviewed 2026-08-01, rates effective 2026-07-02. Plain text version.