# Claude Haiku 4.5 pricing at a million calls a month

> Claude Haiku 4.5 pricing is $1.00 per million input and $5.00 output, with cached reads at $0.10. The million-call tier where small errors get large.

URL: https://getculpa.com/claude-haiku-4-5-pricing
Last reviewed: 2026-08-01
Rates effective: 2026-07-02

## Answer
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.

## Common mistakes
- Leaving the cached rate unused at high call volume. Why it hurts: The cached rate is a tenth of input, so at millions of calls the untaken discount is the largest line you can recover. Do instead: 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. Why it hurts: The five-minute cache write bills at $1.25 per million, above the $1.00 input rate. Do instead: 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. Why it hurts: At a million calls, every thousand prompt tokens is $1,000 a month. Do instead: Price the prompt explicitly: calls times tokens times $1.00 per million. Then decide if it earns its length.

## Self-check
- 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)
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.
  Uncached input: 1,000,000 x 4,000 = 4,000M tokens x $1.00 per million = $4,000
  Output: 1,000,000 x 80 = 80M tokens x $5.00 per million = $400
  Uncached month total = $4,400
  Cached input at an 80% hit rate: (3,200M x $0.10) + (800M x $1.00) = $320 + $800 = $1,120
  Cached month total = $1,520, a saving of $2,880 from prompt ordering alone
$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.

## Cost figures
Every figure carries its confidence and its source. No figure on this site is provider-reported.
- $1.00 / $5.00 per million — Claude Haiku 4.5 input and output rates [calculated] Source: 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] Source: $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] Source: Both endpoints from the teardown arithmetic at real Haiku 4.5 rates. A range because call volume and prompt size are modelled.

## FAQ
Q: How much does Claude Haiku 4.5 cost?
A: $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.

Q: Is the dated Haiku model a different price?
A: 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.

Q: Why does caching matter so much on Haiku?
A: 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.

## Sources
- Anthropic pricing: https://platform.claude.com/docs/en/docs/about-claude/pricing

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