Editorial method
Claude Archive privileges source ownership. An Anthropic launch post can establish a launch date. The Claude Platform model-deprecations page can establish retirement status. The pricing page can establish current rates. A third-party blog post can be useful for finding questions people ask, but it does not override the primary source.
When sources disagree, pages should prefer the most specific official source for the claim. For example, a launch post is better for launch context, while the deprecation page is better for retirement dates.
Indexed sources
Introducing Claude
Public launch of Claude and Claude Instant.
Claude 2
Claude 2 launch, 100K context, claude.ai public beta, API availability.
Introducing Claude 2.1
Claude 2.1 launch, 200K context, system prompts, beta tool use, pricing update.
Introducing the next generation of Claude
Claude 3 family announcement for Haiku, Sonnet, and Opus.
Claude 3.5 Sonnet
First Claude 3.5 model and $3/$15 per MTok price point.
Introducing computer use, a new Claude 3.5 Sonnet, and Claude 3.5 Haiku
Upgraded Sonnet 3.5, Claude 3.5 Haiku, and public beta computer use.
Claude 3.7 Sonnet and Claude Code
Claude 3.7 Sonnet, hybrid reasoning, extended thinking, and Claude Code research preview.
Introducing Claude 4
Claude Opus 4 and Claude Sonnet 4 launch plus Claude Code general availability.
Claude Opus 4.1
Opus 4.1 upgrade and same-pricing note relative to Opus 4.
Introducing Claude Sonnet 4.5
Sonnet 4.5 launch, same $3/$15 per MTok price as Sonnet 4.
Introducing Claude Haiku 4.5
Haiku 4.5 launch and positioning as near-frontier, faster, cheaper model.
Introducing Claude Opus 4.5
Opus 4.5 launch and $5/$25 per MTok Opus pricing.
Claude Opus 4.6
Opus 4.6 launch and 1M token context beta.
Introducing Claude Sonnet 4.6
Sonnet 4.6 launch, 1M context beta, and same pricing as Sonnet 4.5.
Introducing Claude Opus 4.7
Opus 4.7 launch, cybersecurity safeguards, and same pricing as Opus 4.6.
Introducing Claude Opus 4.8
Opus 4.8 launch, effort controls, dynamic workflows, and fast mode pricing.
Claude Fable 5 and Claude Mythos 5
Fable 5 and Mythos 5 launch, access updates, and safeguards context.
Redeploying Fable 5
Fable/Mythos suspension context and Fable 5 return starting July 1, 2026.
Introducing Claude Sonnet 5
Sonnet 5 launch and introductory pricing through August 31, 2026.
Models overview
Current model comparison, IDs, context windows, cutoffs, and availability.
Model deprecations
Lifecycle definitions, model status, deprecation history, retirement dates, replacements.
Pricing
Current per-token pricing, caching, batch, fast mode, and geography pricing notes.
API release notes
Dated API changes, feature launches, model retirements, and deprecation announcements.
System Prompts
Published Claude web and mobile app system-prompt dates and scope caveats.
Migration guide
Developer migration notes for Sonnet 5, Sonnet 4.6, and older generations.
What is not treated as authority
Prompt-leak repositories, social posts, scraped model behavior, and search-result snippets are not authority for factual Claude history on this site. They can suggest a question worth answering, but the answer still needs a primary source.
Similarly, this site does not claim to preserve Anthropic internal records, private model cards, or partner-specific model availability tables unless they are public and source-linked.
Questions this page answers
Does Claude Archive cite unofficial prompt leaks?
No. It uses Anthropic-published system-prompt release notes and excludes leaked prompt repositories.
Can a third-party benchmark page be cited here?
Only if the page is needed to discuss third-party coverage. Model-history facts should come from Anthropic-owned sources when available.