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HomeAnthropicAll changes200K-token tiered pricing used by Sonnet 4.5 removed
Anthropic
Packaging changeDec 29 → Mar 30, 2026

Anthropic API Drops Tiered Pricing for Sonnet 4.6, Goes Flat Rate

Detected Apr 4, 2026AI & Machine Learning
The change200K-token tiered pricing used by Sonnet 4.5 removed
BeforeDec 29200K-token tiered pricing used by Sonnet 4.5
AfterMar 30Not listed
removed
1 change2 capturesDec 29, 2025 → Mar 30, 2026Includes 5 periodsfirst seen Jan 5

What happened

Between the Dec 29, 2025 and Mar 30, 2026 captures of Anthropic's pricing page, Pulse recorded one change: Sonnet 4.6 drops the 200K-token tiered pricing used by Sonnet 4.5. Flat $3/$15 MTok replaces tiers of $3/$6 input and $15/$22.50 output. Extended caching tiers ($7.50/$0.60) also removed. Pulse files it as a packaging change (packaging change). Pulse's latest capture (Nov 9, 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.

This quarterly roll-up includes 5 changes Pulse first recorded in a shorter period: "Anthropic API simplifies pricing, removes volume-based tiers" (week of Mar 9, 2026, saved Mar 16, 2026), "Anthropic API replaces Sonnet 4.5 with 4.6 at same price point" (week of Feb 9, 2026, saved Feb 18, 2026) and "Anthropic API rolls out tiered pricing for Opus 4.6 by context length" (week of Feb 2, 2026, saved Feb 9, 2026) and 2 more. They are the same changes, not new ones. Before that, Anthropic's previous recorded change was "Anthropic API Cuts Flagship Opus Model Prices by 67% in Major Update to Version 4.5, Launching New Pricing Structure" (Jan 10, 2026). Anthropic has been tracked since 2024-11-17.

In the same window Microsoft, OpenAI 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 4.6, Sonnet 4.5Packaging
    Removed

    Before200K-token tiered pricing used by Sonnet 4.5

    AfterNot listed

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 compared

Full-page captures of Anthropic's pricing page (anthropic.com) from Dec 29, 2025 and Mar 30, 2026; the change is marked near the top of the page, where the 200K-token tiered pricing used by Sonnet 4.5 no longer appears.

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The two full-page captures with this change marked up are free with an account.

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Anthropic, the last 90 days

Full history
  1. Jun 2, 2026PackagingAnthropic API launches Opus 4.8 with new fast mode for lightning speeds
  2. May 13, 2026ImprovementAnthropic API consolidates Microsoft 365 and Outlook integrations
  3. Apr 21, 2026PackagingAnthropic API launches Managed Agents at $0.08 per session-hour of runtime
  4. Apr 4, 2026PackagingAnthropic API Drops Tiered Pricing for Sonnet 4.6, Goes Flat Rate This change
  5. Mar 16, 2026PackagingAnthropic API simplifies pricing, removes volume-based tiers
  6. Feb 18, 2026PackagingAnthropic API replaces Sonnet 4.5 with 4.6 at same price point
  7. Week of Feb 2, 2026PackagingAnthropic API rolls out tiered pricing for Opus 4.6 by context length
  8. Feb 9, 2026PackagingAnthropic API unveils Opus 4.6 pricing with new >200K token tiers
  9. Week of Dec 29, 2025PackagingAnthropic API ends holiday promo, drops 2x usage boost for paid subscribers
  10. Jan 10, 2026PackagingAnthropic API Cuts Flagship Opus Model Prices by 67% in Major Update to Version 4.5, Launching New Pricing Structure

Across AI & Machine Learning in the same window

All AI & Machine Learning changes
  1. MicrosoftApr 3Microsoft Copilot adds 4K Clipchamp export, AI image tools to Premium plan
  2. OpenAIApr 2OpenAI restructures Plus plan, moves GPT-5.4 Thinking to credit-based access
  3. XFeb 18X adds real-time voice AI, drops structured outputs from API

Questions about this change

Did Anthropic raise prices in March 2026?

No list-price increase was recorded between Dec 29, 2025 and Mar 30, 2026. The change Pulse detected was a packaging change: packaging change.

What changed on Anthropic's pricing page between Dec 29, 2025 and Mar 30, 2026?

Sonnet 4.6, Sonnet 4.5 packaging removed: 200K-token tiered pricing used by Sonnet 4.5. Pulse compared the captures it took on Dec 29, 2025 and Mar 30, 2026; the before/after table above lists each item as written on the page.

How often does Anthropic change its pricing?

This quarterly roll-up includes 5 changes Pulse first recorded in shorter periods, not new ones; Pulse recorded 1 other pricing-page change for Anthropic in the 90 days before this one; the previous change was "Anthropic API Cuts Flagship Opus Model Prices by 67% in Major Update to Version 4.5, Launching New Pricing Structure" on Jan 10, 2026; Anthropic has been tracked since 2024-11-17.