What Anthropic changed
thecontinuitylayer.com/changes/anthropic10 changes to Anthropic's AI products caught so far: prices, limits, models and data policies, each dated with the published source that confirms it. Latest 3 November 2026.
Every change, newest first
- NotableAnnounced
Since 3 November 2026, text generated by Claude Mythos 5, Claude Opus 4.7 and Claude Sonnet 4.6 carries Anthropic's text watermark on the platforms Anthropic lists; on Sonnet 4.6 a request that sets temperature, top_p or top_k to a non-default value might not carry it. The Decoder reported on 4 November that a notice to API customers extends the watermark to Claude Opus 4.6, Opus 4.5, Sonnet 4.5 and Haiku 4.5 from 16 November 2026, a few days later on Amazon Bedrock, with the same caveat, and that customers cannot turn it off.
Confirmed by provider. Claude Platform release notes, entry dated November 3, 2026, read 7 November 2026; the 16 November expansion is from The Decoder's report of 4 November 2026 of Anthropic's notice to API customers, as Anthropic's content-labeling help page would not open from here. Checked on 7 November 2026.
- MinorUnclear
The pricing page lists a new Ultra plan at $200 a month and Max at $100 a month only; on 23 October 2026 it listed Max in two tiers, the higher one priced only on a help page. The usage-limits page says verified Ultra accounts have no five-hour session limit. Neither page dates the change.
Confirmed by provider. Anthropic's pricing page and its usage-limits help page, read 3 November 2026. Checked on 3 November 2026.
- NotableAnnounced
Anthropic deprecated fast mode for Claude Opus 4.8 on 30 October 2026, with removal on 30 November 2026. After that, API requests to claude-opus-4-8 that set speed to fast return an error; Anthropic points people who want fast mode to Claude Opus 5.5.
Confirmed by provider. Claude Platform release notes, entry dated October 30, 2026, read 6 November 2026. Checked on 6 November 2026.
- Minor
As of October 20, the r/ClaudeAI thread "Has Opus 5.5 entered its nerf phase?", posted about a week after launch, reached about 2,380 votes. It is a community claim with no data behind it yet.
Community only. Reddit thread counted in a secondary write-up; no provider statement or tracker data supports it.
- Minor
LiveNerf, a pre-registered drift benchmark of Opus 5.5 as served through Claude Code on a subscription, published its first result: no degradation found (0.584 to 0.592, plus or minus 1.8). Its smallest detectable effect is about 7.5 points.
Tracker signal. Independent benchmark result, not a provider statement.
- MinorAnnounced
Anthropic deprecated Claude Sonnet 4.5 (claude-sonnet-4-5-20250929), with retirement set for November 30, 2026, and named Sonnet 5.5 as the replacement. The same page notes that the temperature, top_p and top_k API parameters return an error in API version 2026-10-21.
Confirmed by provider. Anthropic's model deprecations page.
- Notable
Claude Opus 5.5 shipped with medium effort by default; Opus 5 defaulted to high. LiveNerf measured medium versus high as a gap of about 4.2 points.
Documented default change. Effort gap measured by the LiveNerf tracker.
- Notable
Claude Code weekly limits were "permanently" raised by 25% for Pro, Max, Team and seat-based Enterprise, replacing a +50% promotion that ran until September 13. Against the promotional level, that is a 17% cut (150 to 125).
Confirmed by provider. Anthropic said: "Compared to today, this works out to a 17% reduction in weekly limits on Claude Code."
- MinorAnnounced
Anthropic announced the deprecation of Claude Sonnet 4 (claude-sonnet-4-20250514) and Claude Opus 4 (claude-opus-4-20250514). Both were retired on June 15, 2026, with Sonnet 5.5 and Opus 4.8 named as replacements. Claude Opus 4.1 followed: announced June 5, retired August 5, 2026.
Confirmed by provider. Anthropic's model deprecations page lists the announcement and retirement dates.
- NotableAnnounced
Claude's memory from chat history opened to all users, including the free plan. Anthropic's help pages say memory is on by default for Free, Pro and Max.
Confirmed by provider. Claude Help Center release notes, entry dated March 2, 2026; the default-on wording is in Anthropic's own release note dated August 25, 2026, on the same page. Checked on 24 October 2026.
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