Anthropic API launches Haiku 5.5 at $0.10/$0.50 per MTok, Haiku 4.5 goes Legacy
What happened
Between the Oct 5, 2026 and Oct 12, 2026 captures of Anthropic's pricing page, Pulse recorded one change: Haiku 5.5 replaces Haiku 4.5 at lower rates ($0.10/$0.50 per MTok in/out, tiered at 100K prompts); Haiku 4.5 moved to Legacy. Sonnet 5.5 cache read $0.20 to $0.10 per MTok. Pulse files it as a pricing change (price decrease) with a downward direction. Pulse's latest capture (Oct 26, 2026) lists Haiku 4.5 at $5 per MTok output + $1.25 per MTok cache write, Sonnet 5 at $2 per MTok input + $10 per MTok output, Opus 5 at $6.25 per MTok cache write + $0.50 per MTok cache read, Fable 5 at $12.50 per MTok cache write + $1 per MTok cache read and Opus 4.8 at $6.25 per MTok cache write + $5 per MTok input.
It lands 3 days after Anthropic's previous change, "Anthropic API launches Haiku 5.5 at $0.10/$0.50, halves Sonnet 5.5 cache reads" (Oct 8, 2026). Before that Pulse recorded "Anthropic API: Opus 5.5 launches, replaces Opus 5 as flagship" (Sep 28, 2026). Anthropic has been tracked since 2024-11-17.
In the same window Google, X, Mistral AI, Microsoft and OpenAI also changed their AI & Machine Learning pricing pages. Those moves are listed further down, and the Pulse Agent can compare them side by side.
- Haiku 5.5, Haiku 4.5, Sonnet 5.5 · Price−50%$0.20$0.10
| Plan | Field | Before | After | Change |
|---|---|---|---|---|
| Haiku 5.5, Haiku 4.5, Sonnet 5.5 | Price | $0.20 | $0.10 | −50% |
Values as written on Anthropic's public pricing page in the two captures Pulse compared; where the page states no number, the cells give the wording before and after.
Evidence
The two captures Pulse comparedFull-page captures of Anthropic's pricing page (anthropic.com) from Oct 5, 2026 and Oct 12, 2026; the change is marked near the top of the page, where haiku 5.5, haiku 4.5, sonnet 5.5 price reads $0.20 and then $0.10.
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The two full-page captures with this change marked up are free with an account.
Anthropic, the last 90 days
Full history- Oct 12, 2026decreaseAnthropic API launches Haiku 5.5 at $0.10/$0.50 per MTok, Haiku 4.5 goes Legacy · this change
- Oct 8, 2026decreaseAnthropic API launches Haiku 5.5 at $0.10/$0.50, halves Sonnet 5.5 cache reads
- Sep 28, 2026improvedAnthropic API: Opus 5.5 launches, replaces Opus 5 as flagship
Across AI & Machine Learning in the same window
All AI & Machine Learning changes- GoogleOct 12Google Workspace swaps Gems for AI skills, rewords Gemini on Starter plan
- XOct 12X adds Grok Imagine Video 1.5 Lite to API from $0.02/sec, up to 1080p
- Mistral AIOct 12Mistral AI cuts Free plan API credits, gives free users Vibe CLI and IDE tools
- MicrosoftOct 12Microsoft Teams Home cuts Family and Premium storage from 6 TB to 2 TB shared
- OpenAIOct 11OpenAI rewrites Free, Go, Plus and Pro taglines in "Best for" style
Questions about this change
Did Anthropic raise prices in October 2026?
No — prices went down. Between Oct 5, 2026 and Oct 12, 2026 Anthropic's pricing page showed 1 price cut: Haiku 5.5, Haiku 4.5, Sonnet 5.5: $0.20 → $0.10 (−50%).
What changed on Anthropic's pricing page between Oct 5, 2026 and Oct 12, 2026?
Haiku 5.5, Haiku 4.5, Sonnet 5.5 price: $0.20 → $0.10 (−50%). Pulse compared the captures it took on Oct 5, 2026 and Oct 12, 2026; the before/after table above lists each item as written on the page.
How often does Anthropic change its pricing?
Pulse recorded 2 other pricing-page changes for Anthropic in the 90 days before this one; the previous change was "Anthropic API launches Haiku 5.5 at $0.10/$0.50, halves Sonnet 5.5 cache reads" on Oct 8, 2026; Anthropic has been tracked since 2024-11-17.