generated: '2026-08-10'
method: probed
source: live HTTP probes of casetext.com + Thomson Reuters press releases
summary: >-
  Casetext is a RETIRED BRAND, not a live provider. Thomson Reuters closed its $650M
  all-cash acquisition on 2023-08-17, redirected casetext.com to a Thomson Reuters CoCounsel
  page on 2025-02-01, ended CoCounsel 1.0 access on the Casetext platform on 2025-03-31, and
  shut the standalone platform down on 2025-04-01. As of the 2026-08-10 probe the entire
  domain answers HTTP 410 Gone from a Cloudflare edge with a hand-written retirement notice;
  the apex 301s to thomsonreuters.com/en/cocounsel. There is nothing left to deprecate.

state: retired
operational: false

versioning:
  scheme: null
  current: null
  docs: null
  note: No API and no versioned contract ever existed publicly, so there is no version scheme.

deprecation:
  policy_url: null
  sunset_header: false
  note: >-
    Casetext published no deprecation or sunset policy. The shutdown was executed as a
    blanket HTTP 410 Gone across every path rather than via RFC 8594 Sunset/Deprecation
    headers on a versioned contract. No `type: Deprecation` pointer is emitted in apis.yml —
    a retirement event is not a published deprecation policy, and crediting one here would
    award the provider a governance artifact it never wrote.

sla:
  url: null
  uptime_target: null

status_page: null
status_page_note: >-
  No status page exists and none is inherited. No `type: StatusPage` pointer is emitted.

retirement:
  final_state: 410 Gone (sitewide)
  apex_redirect: https://www.thomsonreuters.com/en/cocounsel
  retirement_notice: >-
    "This service is no longer available, but we appreciate you being a part of it. For legal
    research, please visit Westlaw, and if you're curious about legal AI, ..."
  successor_product: Thomson Reuters CoCounsel (CoCounsel Legal, inside the Westlaw ecosystem)
  successor_url: https://www.thomsonreuters.com/en/cocounsel
  data_migration_note: >-
    Thomson Reuters did not migrate CoCounsel 1.0 chats or chat-uploaded documents into the
    successor platform; access to them ended with the 2025-03-31 cutoff.

timeline:
- date: '2013'
  event: Casetext founded by Jake Heller, Joanna Huey, and Laurence Pfeffer
  confidence: high
- date: '2023-03'
  event: CoCounsel released, built on OpenAI GPT-4
  confidence: high
- date: '2023-06-26'
  event: Thomson Reuters announces agreement to acquire Casetext for $650M
  source: https://www.thomsonreuters.com/en/press-releases/2023/june/thomson-reuters-to-acquire-casetext-an-ai-leader-for-legal-professionals.html
  confidence: high
- date: '2023-08-17'
  event: >-
    Acquisition closes. "Thomson Reuters ... announced today that it has closed on its
    previously announced acquisition of Casetext, Inc. ... for a purchase price of $650
    million in cash."
  source: https://www.thomsonreuters.com/en/press-releases/2023/august/thomson-reuters-completes-acquisition-of-casetext-inc
  confidence: high
  verified: '2026-08-10'
- date: '2025-02-01'
  event: casetext.com begins redirecting to the Thomson Reuters CoCounsel page
  confidence: medium
  note: Reported consistently across secondary sources; Thomson Reuters' own CoCounsel 2.0 migration help page now returns 404.
- date: '2025-03-31'
  event: Last day of CoCounsel 1.0 access on the Casetext platform
  confidence: medium
- date: '2025-04-01'
  event: Standalone Casetext platform shut down
  confidence: medium
- date: '2025-08'
  event: CoCounsel Legal launched by Thomson Reuters, integrated into Westlaw
  confidence: medium
- date: '2026-08-10'
  event: Probe confirms sitewide HTTP 410 Gone; all developer-relevant subdomains NXDOMAIN
  confidence: high
  verified: true

deprecated_operations: []

evidence:
- {url: 'https://casetext.com/', status: 301, note: 'Location: https://www.thomsonreuters.com/en/cocounsel'}
- {url: 'https://casetext.com/pricing/', status: 410}
- {url: 'https://casetext.com/cocounsel/', status: 410}
- {url: 'https://casetext.com/blog/', status: 410}
- {url: 'https://casetext.com/signin/', status: 410}
- {url: 'https://casetext.com/about/', status: 410}
- {url: 'https://casetext.com/robots.txt', status: 410}
- {url: 'https://casetext.com/sitemap.xml', status: 410}
- {url: 'https://parallelsearch.casetext.com/', status: 410, note: served the retirement notice}
- {url: 'https://compose.law/', status: 404, note: '"Site Not Configured" holding page; TLS cert does not match the host'}
- {url: 'https://www.thomsonreuters.com/en-us/help/cocounsel/legal/get-started/cocounsel-2-0-migration-information', status: 404, note: Thomson Reuters removed its own migration help page}
- {host: api.casetext.com, dns: NXDOMAIN}
- {host: developer.casetext.com, dns: NXDOMAIN}
- {host: docs.casetext.com, dns: NXDOMAIN}
- {host: app.casetext.com, dns: NXDOMAIN}
- {host: cocounsel.casetext.com, dns: NXDOMAIN}