Anthropic
Anthropic is a San Francisco public benefit corporation that develops the Claude language models.
| Model | Released | Weights | Hosts | Cheapest host | Input | Output |
|---|---|---|---|---|---|---|
| Claude Haiku 5.5 | Oct 2026 | Closed | 1 | Anthropic | $0.10 | $0.50 |
| Claude Sonnet 5.5 | Sep 2026 | Closed | 1 | Anthropic | $2.00 | $10.00 |
| Claude Opus 5.5 | Sep 2026 | Closed | 1 | Anthropic | $4.00 | $20.00 |
| Claude Fable 5.1 | Sep 2026 | Closed | 3 | Anthropic | $10.00 | $50.00 |
| Claude Opus 5 | Jul 2026 | Closed | 3 | Anthropic | $5.00 | $25.00 |
| Claude Sonnet 5 | Jun 2026 | Closed | 3 | Anthropic | $2.00 | $10.00 |
| Claude Fable 5 | Jun 2026 | Closed | 3 | Anthropic | $10.00 | $50.00 |
| Claude Haiku 4.5 | Oct 2025 | Closed | 1 | Anthropic | $1.00 | $5.00 |
| Claude Sonnet 4.5 | Sep 2025 | Closed | 1 | Anthropic | $3.00 | $15.00 |
| Claude Opus 4.1 | Aug 2025 | Closed | 1 | Anthropic | $15.00 | $75.00 |
10 of 10 models · prices per million tokens at the cheapest host, read Oct 23, 09:51 UTC
About Anthropic
- Founders
- Dario Amodei, Daniela Amodei, Tom Brown, Jack Clark, Jared Kaplan, Sam McCandlish, Chris Olah, Ben Mann7, 8
- Led by
- Dario Amodei (CEO)7
- First model
- Claude, Mar 20234
- Mission
- "AI research and products that put safety at the frontier."7
Anthropic was founded in 2021 and is headquartered in San Francisco, California.1, 2, 5, 6
Its co-founders include Dario Amodei and Daniela Amodei, siblings who both held vice president roles at OpenAI before the company was created, along with other former OpenAI staff such as Tom Brown, Jack Clark, Jared Kaplan, Sam McCandlish and Chris Olah.1, 5, 6, 7, 8
As of October 2026, Dario Amodei serves as chief executive officer.7
The company is incorporated in Delaware as a public benefit corporation.3
It states its mission as AI research and products that put safety at the frontier.7
Its first language model, Claude, reached the public on 14 March 2023 in two versions, Claude and Claude Instant.4
The Claude 3 family was announced on 4 March 2024, and Claude 3.5 Sonnet followed on 21 June 2024 as the first release of the 3.5 family.10, 11
The current generation is the Claude 5.5 family, which began with Claude Opus 5.5 on 22 September 2026 and now also includes Claude Sonnet 5.5 and Claude Haiku 5.5, while the documentation lists Claude Fable 5.1 as a further current model.12, 13, 14
Anthropic is headquartered in the United States, may process API data there and in other countries, and lets API customers limit inference to US infrastructure.2, 9
Official links
- Website anthropic.com
- API docs platform.claude.com/docs/en/home
- Pricing platform.claude.com/docs/en/about-claude/pricing
- GitHub github.com/anthropics
- Hugging Face huggingface.co/Anthropic
- Blog anthropic.com/news
- X x.com/AnthropicAI
- LinkedIn linkedin.com/company/anthropicresearch
Sources
- Anthropic expands SF HQ, opening door to a campus that can rival OpenAI’s | The San Francisco Standard · sfstandard.com · read Oct 23
- Privacy Policy \ Anthropic · anthropic.com · read Oct 23
- The Long-Term Benefit Trust \ Anthropic · anthropic.com · read Oct 23
- Introducing Claude \ Anthropic · anthropic.com · read Oct 23
- Dario and Daniela Amodei: The 100 Most Influential People in AI 2023 · time.com · read Oct 23
- Anthropic Cements 240K SF Lease On Howard Street · bisnow.com · read Oct 23
- Leadership at Anthropic \ Anthropic · anthropic.com · read Oct 23
- Singapore office and government MOU | Anthropic \ Anthropic · anthropic.com · read Oct 23
- Data residency - Claude Platform Docs · platform.claude.com · read Oct 23
- Introducing the next generation of Claude \ Anthropic · anthropic.com · read Oct 23
- Introducing Claude 3.5 Sonnet \ Anthropic · anthropic.com · read Oct 23
- Introducing Claude Opus 5.5 \ Anthropic · anthropic.com · read Oct 23
- Newsroom \ Anthropic · anthropic.com · read Oct 23
- Models overview - Claude Platform Docs · platform.claude.com · read Oct 23
Every fact above links to its source and the date it was read; last checked Oct 23. Not affiliated with Anthropic. Corrections or removal on request: contact.