LLM WORLD

Claude 1

Anthropic ·

Verified

2 of 2 published values traced to a source2 primary sources, 2 archived1 not disclosed by the lab1 not researched yet

Why this status

Every value this record asserts — date (Mar 14, 2023) and context window (9K) — was found in an archived primary source, checked 2026-08-10. Parameter count is not recorded, so nothing is claimed about it. Capabilities evidenced from the primary sources: coding: “Claude can help with use cases including summarization, search, creative and collaborative writing, Q&A, coding, and more.”.

What these states mean · How records are judged · Has this record changed?

Anthropic's debut Claude model focused on helpfulness, harmlessness, and long-context dialogue.

codingflagship

Details

ReleasedMarch 14, 2023
stated in anthropic.com

Claude 1 was released on March 14, 2023.

CompanyAnthropic
FamilyClaude
Lineagebefore Claude 2
EraThe assistant boom
TypeLanguage model · LLM
ModalitiesText → Text
CapabilitiesCoding
WeightsProprietary
LicenceNot applicable — proprietary
Context window9K tokens
stated in anthropic.com

Claude 1 supports a context window of 9,000 tokens.

ParametersNot disclosed

Current information, elsewhere

This record is a historical one: every figure above is traced to a dated primary source. For what is true today — live pricing, current rankings, availability — these are better maintained than anything here could be.

Sources

Record status: verified · confidence 90/100 · 2 of 2 primary

Every value this record asserts — date (Mar 14, 2023) and context window (9K) — was found in an archived primary source, checked 2026-08-10. Parameter count is not recorded, so nothing is claimed about it. Capabilities evidenced from the primary sources: coding: “Claude can help with use cases including summarization, search, creative and collaborative writing, Q&A, coding, and more.”.

Primary means published by the organisation that made the model. Verified records require at least one.

Claude family

  1. Claude 1 March 14, 2023
  2. Claude 2 July 11, 2023
  3. Claude 3 Opus March 4, 2024
  4. Claude 3.5 Sonnet June 21, 2024
  5. Claude 3.7 Sonnet February 24, 2025
  6. Claude Opus 4 May 22, 2025
  7. Claude Sonnet 4.5 September 29, 2025
  8. Claude Haiku 4.5 October 15, 2025
  9. Claude Opus 4.5 November 24, 2025
  10. Claude Opus 4.6 February 5, 2026
  11. Claude Sonnet 4.6 February 17, 2026
  12. Claude Opus 4.7 April 16, 2026
  13. Claude Opus 4.8 May 28, 2026
  14. Claude Fable 5 June 9, 2026
  15. Claude Mythos 5 June 9, 2026
  16. Claude Sonnet 5 June 30, 2026
  17. Claude Opus 5 July 24, 2026
  18. Claude Fable 5.1 September 1, 2026
  19. Claude Mythos 5.1 September 1, 2026
  20. Claude Opus 5.5 September 22, 2026
  21. Claude Sonnet 5.5 September 28, 2026
  22. Claude Haiku 5.5 October 7, 2026

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