Timeline of Claude Session Limits¶

A chronological overview of how Anthropic has changed Claude's usage limits, session windows, and peak hours system.

2023¶

Sep 2023 — Claude Pro launches¶

Anthropic introduced the Claude Pro plan at $20/month, initially in the US and UK. Usage limit: at least 100 messages per 8-hour period, then reset. This was more generous than ChatGPT Plus at the time (50 messages per 3 hours).

Source: SiliconANGLE

2024¶

Mid-2024 — Shift to 5-hour rolling window¶

Anthropic transitioned from the original 100 messages / 8 hours to a 5-hour rolling window model. Pro subscribers could expect roughly 45 messages per 5 hours, varying by conversation length and model. The exact date was not prominently announced.

Dec 2024 — First public discussion of session limit changes¶

Early community discussion on Reddit about session limit frustrations, predating Claude Code's launch.

Source: r/ClaudeAI

2025¶

Feb 2025 — Claude Code launches¶

Anthropic released Claude Code as a limited research preview — an agentic CLI tool for coding. Initially available to Pro subscribers only.

Apr-May 2025 — Max plan introduced¶

Anthropic launched the Max plan with two tiers:

Both tiers included priority access to newest features and models.

Source: Anthropic

May 2025 — Claude Code reaches general availability¶

Claude Code became available to all users including free tier. Demand began growing rapidly.

Jul 28, 2025 — Weekly rate limits announced¶

Anthropic announced new weekly rate limits on top of the existing 5-hour session limits, targeted at heavy Claude Code users. Effective date: August 28, 2025. Estimated to affect fewer than 5% of subscribers.

Expected weekly allowances:

Max subscribers gained the ability to purchase additional usage at API rates.

Source: TechCrunch

Aug 28, 2025 — Weekly rate limits go into effect¶

The dual-layer system became active: 5-hour rolling session window plus a 7-day weekly ceiling.

Source: Portkey

Sep 2025 — Sonnet 4.5 triggers usage limit crisis¶

Claude Sonnet 4.5 released. Users immediately reported dramatically reduced effective usage:

• Before: Pro users expected 40-80 hours/week
• After: Users reported only 6-8 hours/week — an ~85% reduction
• 30+ bug reports filed on GitHub (Issue #9094), 121 comments
• Users on Max 20x exhausting limits in 3 days
• Some users consuming 27% of their 5-hour limit with just 2 requests

Oct 2025 — Megathread and widespread complaints¶

r/ClaudeAI created a dedicated megathread for usage limit complaints. Widespread reports of Pro, Max 5x, and Max 20x plans being unusable. Users reported cancellations and downgrades.

Dec 25-31, 2025 — Holiday 2x usage promotion¶

Anthropic doubled both 5-hour session limits and weekly caps for Pro and Max subscribers. Applied to Claude web app, Claude Code, and Claude in Chrome. No additional charge.

Source: Claude Help Center

2026¶

Jan 2026 — Post-holiday limit complaints¶

After the holiday promotion expired, developers reported sharply reduced capacity. Some claimed ~60% reduction vs. pre-holiday baseline. Max subscribers hitting limits in 10-15 minutes. Anthropic attributed it to normal return to standard limits.

Source: The Register

Early 2026 — Opus-specific caps removed¶

For Claude and Claude Code users with Opus 4.5 access, Anthropic removed Opus-specific caps. Max and Team Premium users received increased overall limits so Opus token allowance roughly matched previous Sonnet levels.

Source: Anthropic

Mar 13-28, 2026 — Off-peak 2x usage promotion¶

Anthropic doubled usage limits during off-peak hours for two weeks. Eligible for Free, Pro, Max, and Team plans (not Enterprise). Extra usage did not count toward weekly limits.

Source: Claude Help Center

Mar 23-26, 2026 — Peak hours system introduced¶

Users began noticing rapid limit depletion around March 23 (usage meters jumping from 52% to 91% in minutes). Anthropic remained silent for several days.

On March 26, Anthropic engineer Thariq Shihipar confirmed via X/Twitter and Reddit that Anthropic was adjusting 5-hour session limits during peak hours:

• Peak hours: Weekdays 5:00-11:00 AM PT / 1:00-7:00 PM GMT
• During peak, token cost per session is higher — the 5-hour allowance depletes faster
• During off-peak, users get more out of their session
• Weekly limits unchanged — only intra-week distribution changed
• ~7% of users affected, particularly Pro tier
• Max 20x users largely insulated (~2% seeing differences)

Sources: The Register, gHacks, TechRadar, MacRumors

Summary¶

The limit system has evolved through several phases:

The overall trend: as Claude's capabilities and user base grew, Anthropic progressively added more layers to manage demand — from simple message counts to time-based sessions to weekly caps to peak-hour multipliers.