Model board / Claude Haiku 5.5

Verified 2026-10-08 against the pages listed below. Prices are USD per 1M tokens, list rate — no committed-use, enterprise or volume discount.

for prompts up to 100,000 tokens; above that the whole request bills $0.50 in / $0.05 cache read / $0.625 5m write / $2.50 out — five times the short-prompt rate. 1h cache write $0.20 ($1.00 above 100K). Released 2026-10-07

300K max output on the Message Batches API with a beta header

read 0.1x input; caches from 512 tokens, an eighth of Haiku 4.5's 4,096

Watch out

Not a drop-in swap for Haiku 4.5 code: adaptive thinking is on by default at medium effort, so responses can begin with thinking blocks billed at the output rate; budget_tokens, assistant prefill and any non-default temperature, top_p or top_k return 400. The same text counts as about 30% more tokens. Priority Tier is not supported

What we would use it for

Anthropic's high-volume tier — classification, routing, extraction and subagent work — at a tenth of Haiku 4.5's price below 100K tokens

What this has cost, week by week

Output price at each refresh since 2026-10-08. A vendor change is the provider changing its price. Our correction means this board changed what it prints and the provider's charge did not move — the two are never merged, because publishing the second as the first would be a price rise that never happened.

Nothing has moved since we started tracking it.

Where these numbers came from

• https://platform.claude.com/docs/en/about-claude/pricing
• https://platform.claude.com/docs/en/about-claude/models/overview
• https://platform.claude.com/docs/en/models/haiku-5-5/overview
• https://platform.claude.com/docs/en/models/haiku-5-5/whats-new-haiku-5-5
• https://platform.claude.com/docs/en/models/haiku-5-5/migration-guide
• https://platform.claude.com/docs/en/build-with-claude/prompt-caching
• https://platform.claude.com/docs/en/release-notes/overview

No number on this page was written that was not read from one of those pages on 2026-10-08. If one is wrong, send us the source URL and it is corrected in the next weekly refresh, with a changelog line saying what was wrong — contact@naderu.com.

Jobs this is one of our picks for

• Chat assistant — Multi-turn conversation, the ordinary case (chat-assistant)

Discussed in Naderu Weekly

• Stop paying for words you throw away — 2026-10-08

The rest of the board

This row sits alongside 69 others on the model board, refreshed every week. The same data as JSON, and the terms for using it, are at /board-data.