Anthropic API launches Haiku 5.5 at $0.10/$0.50, halves Sonnet 5.5 cache reads
What happened
Between the Oct 5, 2026 and Oct 8, 2026 captures of Anthropic's pricing page, Pulse recorded 2 changes: Haiku 5.5 added to Latest models: input $0.10 / output $0.50 per MTok (prompts >100K: $0.50 / $2.50), cache read $0.01 / write $0.125 (>100K: $0.05 / $0.625). Haiku 4.5 moved to Legacy models with prices unchanged ($1/$5, cache $0.10/$1.25); Sonnet 5.5 prompt caching read price cut from $0.20 to $0.10 per MTok; cache write ($2.50), input ($2) and output ($10) unchanged. Pulse files it as a pricing change (price decrease, new plan) with a downward direction. Pulse's latest capture (Oct 12, 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 + $0.5 per MTok cache read, Fable 5 at $12.5 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 11 days after Anthropic's previous change, "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 OpenAI, Microsoft, Google, Scale and X also changed their AI & Machine Learning pricing pages. Those moves are listed further down, and the Pulse Agent can compare them side by side.
- Sonnet 5.5 · Price−50%$0.20$0.10 per MTok
- Haiku 5.5 · PlanAddedNo Haiku 5.5Haiku 5.5
| Plan | Field | Before | After | Change |
|---|---|---|---|---|
| Sonnet 5.5 | Price | $0.20 | $0.10 per MTok | −50% |
| Haiku 5.5 | Plan | No Haiku 5.5 | Haiku 5.5 | Added |
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 8, 2026; the change is marked near the top of the page, where sonnet 5.5 price reads $0.20 and then $0.10 per MTok.
Sign in to see the evidence
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
- Oct 8, 2026decreaseAnthropic API launches Haiku 5.5 at $0.10/$0.50, halves Sonnet 5.5 cache reads · this change
- 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- OpenAIOct 9OpenAI rewrites plan taglines across Free, Go, Plus and Pro tiers
- MicrosoftSep 28Microsoft Speech: batch enhanced-feature no-extra-charge note removed
- GoogleSep 7Google Workspace: promo discount cut from 50% to 30%/20% off
- ScaleAug 28Scale rebrands GenAI Platform to GenAI Portfolio; no pricing or feature changes
- XAug 24X drops grok-4.5, adds Imagine image/video models and free Playground perk
Questions about this change
Did Anthropic raise prices in October 2026?
No — prices went down. Between Oct 5, 2026 and Oct 8, 2026 Anthropic's pricing page showed 1 price cut: Sonnet 5.5: $0.20 → $0.10 per MTok (−50%).
What changed on Anthropic's pricing page between Oct 5, 2026 and Oct 8, 2026?
Sonnet 5.5 price: $0.20 → $0.10 per MTok (−50%); Haiku 5.5 plan: No Haiku 5.5 → Haiku 5.5, added. Pulse compared the captures it took on Oct 5, 2026 and Oct 8, 2026; the before/after table above lists each item as written on the page.
How often does Anthropic change its pricing?
Pulse recorded 1 other pricing-page change for Anthropic in the 90 days before this one; the previous change was "Anthropic API: Opus 5.5 launches, replaces Opus 5 as flagship" on Sep 28, 2026; Anthropic has been tracked since 2024-11-17.