Claude 2.1
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A to Z
- A · App
- Yes
- B · Built By
- Anthropic
- C · CEO & Politics
- Dario Amodei — Pro-AI-regulation; first-ever $1M personal donation to bipartisan Public First super PAC (Jul 2026); otherwise avoids partisan politics
- D · Date
- 2023
- E · Expertise
- Beginner (app available)
- F · Free Tier
- Yes
- G · Generates
- Text only
- H · Deployment
- Cloud only (proprietary)
- I · Inputs
- Text
- J · Jurisdiction
- USA
- K · Key Staffers
- Daniela Amodei (President & Co-Founder), Jack Clark (Co-Founder, Policy), Tom Brown (Co-Founder), Sam McCandlish (Co-Founder), Jared Kaplan (Co-Founder, Chief Science Officer), Mike Krieger (Labs), Paul Smith (CCO)
- L · Languages
- English-primary
- M · Model Type
- LLM
- N · Safety Issues
- None reported
- O · Open Source
- Proprietary
- P · Pricing
- Retired (Claude API retired Claude 2.1 on July 21, 2025)
- Q · AIDb Rating
- 4/10 · AIDb v2.0 (curated): Capability 3/10 · Currency 4/10 · Access 7/10 · Significance 4.5/10 → 4.02
- R · What Makes It Special
- Anthropic's Claude 2.1 (November 21, 2023), which doubled Claude's context window to an industry-leading 200K tokens (about 150,000 words, or over 500 pages), halved false statements compared with Claude 2.0, cut incorrect answers on long documents by 30%, and added system prompts and a beta of tool use for calling developer-defined functions and APIs; it powered claude.ai and the API. Retired July 21, 2025.
- S · Stock / Status
- Private ($380B valuation, Feb 2026); confidentially filed for IPO Jun 1, 2026
- T · Training Cutoff
- [UNKNOWN]
- U · Users
- [UNKNOWN]
- V · Voice Chat
- Yes
- W · Weights
- API only
- X · X Handle
- @AnthropicAI
- Y · Year Founded
- [UNKNOWN]
- Z · Bottom Line
- Proprietary LLM from Anthropic, released 2023.
Data completeness 88% · Last verified 2026-08-09 · Primary source ↗
Cite this
“Claude 2.1.” AIDb — The AI Database. Verified 2026-08-09. https://theaidatabase.com/m/claude-2-1-anthropic.html
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