Claude (Anthropic)

Receipts (chronological)

• 2026-09-24 · major · nerf 0 · price-decrease
  Claude Opus 5.5 Launch: 40% Cost Reduction
  Anthropic released Claude Opus 5.5, delivering Fable 5.1-level performance at 40% lower cost than Opus 5. This represents a significant price decrease for enterprise users.
  Predicted impact: 56-70% of paid users · ~$0-$70 savings per user
• 2026-09-23 · major · nerf 0 · price-decrease
  Claude Opus 5.5 Launch: 40% Cost Reduction
  Anthropic released Claude Opus 5.5, delivering Opus 5.1-level performance at 40% lower cost than Opus 5. This represents a significant price decrease for enterprise users.
  Predicted impact: 56-70% of paid users · ~$0-$70 savings per user
• 2026-06-09 · minor · nerf 18 · feature-gated
  Claude Fable 5 hard-refuses cybersecurity, bio/chem, and 'distillation' prompts - silently routing them to the older Opus 4.8
  Anthropic launched Claude Fable 5 on June 9, 2026 - a new 'Mythos-class' flagship 'made safe for general use' at $10/M input and $50/M output. The catch for security and science users: when Fable 5 detects a request in three domains - offensive/exploitation cybersecurity, most biology and chemistry, and prompts that try to 'distill' Claude's capabilities - it does not answer; the request is automatically handled by the older Claude Opus 4.8 instead. Anthropic says >95% of sessions hit no fallback and users are told when it happens. The unrestricted version, Claude Mythos 5, is gated to authorized cybersecurity partners and selected biology researchers only.
  Predicted impact: 9-21% of paid users · ~$3-$30 per user
• 2026-05-14 · major · nerf 47 · billing-model-shift
  Anthropic moves Claude Agent SDK / programmatic usage off subscription pools to a separately-metered API-rate credit (June 15)
  Per Anthropic's own help center, starting June 15, 2026 programmatic Claude usage - the Agent SDK and `claude -p` headless mode - stops drawing from Pro/Max/Team/Enterprise subscription limits and instead draws from a separate monthly Agent SDK credit billed at standard API rates. Interactive Claude Code in the terminal is unaffected. For anyone running agents or automations on a Claude subscription, the prior 'programmatic loops at subscription pricing' arrangement ends - that usage is now metered at full API rates.
  Predicted impact: 49-70% of paid users · ~$7-$350 per user
• 2026-04-15 · minor · nerf 18 · feature-gated
  Anthropic moved newer Claude models to dateless model IDs (still pinned)
  Anthropic stopped issuing dated snapshot IDs for newer models (the 4.6 generation onward) in favor of dateless IDs. Per Anthropic's model docs these dateless IDs are still pinned snapshots, not floating pointers - so version pinning is intact.
  Predicted impact: 9-21% of paid users · ~$3-$30 per user
• 2025-09-17 · major · nerf 36 · model-swap
  Anthropic admits to August 2025 Claude quality regression
  After weeks of community complaints about Claude Code ignoring CLAUDE.md guidelines, Anthropic acknowledged a quality regression in August 2025.
  Predicted impact: 35-70% of paid users · ~$4-$42 per user
• 2025-04-09 · info · nerf 0 · tier-added
  Anthropic launches Claude Max plan at $100 and $200/mo - mirrors ChatGPT Pro
  Anthropic introduced a two-level Claude Max plan on April 9, 2025: $100/mo for 5x Pro usage and $200/mo for 20x Pro usage. The tier later absorbed Claude Code access exclusively in April 2026.
  Predicted impact: 1-3% of paid users · ~$0-$1 savings per user