Anthropic
Anthropic is the AI safety company behind the Claude models, Claude Code and the Model Context Protocol (MCP). It is a public benefit corporation founded in 2021 by former OpenAI staff, and was reported in 2026-05 (TechCrunch) to be valued at $965B post-money.
Overview
- Founded: 2021, San Francisco
- CEO: Dario Amodei; President: Daniela Amodei (secondary source, Wikipedia)
- CFO: Krishna Rao (named in TechCrunch’s 2026-05-28 Series H report)
- Structure: public benefit corporation. A confidential draft S-1 for an IPO was reported submitted to the SEC on 2026-06-01; no listing date had been announced when this note was checked.
- Website: https://www.anthropic.com/
Models
Current lineup, see anthropic-claude for the full table and API IDs.
| Model | Released | Role |
|---|---|---|
| Claude Fable 5.1 | 2026-09-01 | top generally available tier (“Mythos-class”, with safety classifiers) |
| Claude Opus 5.5 | 2026-09-22 | long-running agentic coding and knowledge work; Anthropic’s suggested default |
| Claude Sonnet 5.5 | 2026-09-28 | speed and intelligence balance |
| Claude Haiku 5.5 | 2026-10-07 | fastest and cheapest tier; priced by prompt length with a step at 100K tokens (pricing); succeeds Haiku 4.5 |
| Claude Mythos 5.1 | 2026-09-01 | invite-only variant for vetted cyberdefenders and life scientists (Project Glasswing) |
Earlier releases, newest first:
- 2026: Opus 4.8 (05-28), Opus 4.7 (04-16), Sonnet 4.6 (02-17), Opus 4.6 (02-06). Mythos Preview was announced with Project Glasswing on 2026-04-07; Mythos 5 and Fable 5 followed on 2026-06-09.
- 2026-10-07: Claude Haiku 5.5 released.
- 2025: Opus 4.5 (11-24), Haiku 4.5 (10-15), Sonnet 4.5 (09-29), Opus 4.1, Claude 4 (claude-4, 05), Claude 3.7 Sonnet (02).
- 2024: Claude 3.5 Sonnet and Claude 3.5 Haiku; the Claude 3 family (03).
The 5.x models take text and images, offer 1M-token context and use adaptive thinking. Billing is per token (Batch API discounted); see the vendor pricing page rather than this note.
Products
- Claude apps: claude.ai, Claude Desktop, and Claude Tag (Claude in Slack channels, 2026).
- Claude Code: terminal and IDE coding agent. Research preview 2025-02, general availability 2025-05, Claude Code 2.0 with Sonnet 4.5 in 2025-09. Anthropic acquired the JavaScript runtime startup Bun in 2025-12 (secondary source) to speed it up.
- Claude Agent SDK: the Claude Code agent loop as a library, renamed from the Claude Code SDK in 2025-09.
- Claude Cowork: agent for non-developers (2026-01). Claude Design followed (2026-08).
- Model Context Protocol: see below.
- Cloud availability: Claude API, Amazon Bedrock, Google Cloud and Microsoft Foundry (see Microsoft).
Model Context Protocol (MCP)
- 2024-11: Anthropic introduced MCP, an open standard for connecting models to tools and data through a list of tools instead of code embedded in each agent. An MCP client such as Claude Desktop is needed to use it.
- 2025: spec revisions on 2025-03 (remote servers), 2025-06-18 (structured tool output, OAuth authorization, elicitation) and 2025-11-25 (first anniversary: Tasks, improved OAuth, security).
- 2025-12: Anthropic donated MCP to the new Agentic AI Foundation under the Linux Foundation, co-founded with Block and OpenAI and supported by Google, Microsoft, AWS, Cloudflare and Bloomberg (per Anthropic’s announcement, search result) (see agentic-ai-foundation).
Funding and valuation
| Date | Round | Amount | Post-money |
|---|---|---|---|
| 2025-03 | Series E | $3.5B | $61.5B |
| 2025-09 | Series F | $13B | $183B |
| 2026-02-12 | Series G | $30B | $380B |
| 2026-05 | Series H | $65B | $965B |
The Series H (TechCrunch, 2026-05-28) was led or co-led by Altimeter, Dragoneer, Greenoaks, Sequoia, Capital Group, Coatue and D1, with Samsung, SK Hynix and Micron among participants. Run-rate revenue was reported at $47B in May 2026. The Series G was led by GIC and Coatue. Rounds before Series H are from Wikipedia (secondary source).
Compute and cloud deals
- amazon: the long-standing major investor and cloud partner, so Amazon Bedrock hosts Claude; a further $5B was reportedly committed in 2026-04 (press; not verified here).
- Google: up to 1 million custom TPUs, over 1 GW of capacity (2025-10; press-reported, no primary source in Sources).
- Microsoft and NVIDIA (2025-11-18): per the Microsoft blog (search-result summary, page not opened in full), Anthropic committed to 10B and Microsoft up to $5B. Claude joined Microsoft Foundry, GitHub Copilot and Microsoft 365 Copilot, reportedly making it available on all three major clouds. See Nvidia.
- 2026 (secondary source): AMD 2 GW of MI450 GPUs (07), Akamai 45B for 460 MW (08), and access to xAI’s Colossus 1 data centre (05). Not checked against primary announcements.
Timeline 2025-2026
- 2025-05: Claude 4 and Claude Code GA.
- 2025-09: $1.5B settlement with authors over pirated books (per Wikipedia, secondary).
- 2025-12: MCP donated to the Linux Foundation.
- 2026-01: Claude Cowork.
- 2026-02/03: dispute with the US Department of Defense, reported as concerning Anthropic’s refusal to drop restrictions on lethal autonomous weapons and domestic mass surveillance. The Pentagon reportedly listed Anthropic a supply chain risk in 2026-03; a federal judge reportedly issued a preliminary injunction on 2026-03-26 (secondary source), but on 2026-09-25 the D.C. Circuit reportedly upheld the designation 2-1 (CNBC search result; page not opened in full).
- 2026-04-07: Project Glasswing announced. Launch partner list (AWS, Apple, Broadcom, Cisco, CrowdStrike, Google, JPMorganChase, the Linux Foundation, Microsoft, NVIDIA, Palo Alto Networks) is not checked against a primary source.
- 2026-06-01: confidential IPO filing reported by press (not confirmed by Anthropic in Sources).
Partnerships and related
- Microsoft runs Claude inside Microsoft 365 Copilot; Copilot Cowork (GA 2026-06-16, per press; not verified) is built on Claude’s agent framework.
- Apple Siri extensions for third-party chatbots including Claude were reportedly announced for iOS 27 (not verified here; see apple).
- Competitors: OpenAI, Google.
Corrections to the earlier version
The previous note put the MCP SDK releases in “Dec 2024” (they were late 2025), gave Claude 3.7 Sonnet as 2025-03 (released 2025-02) and attributed “30+ hour autonomous operation” to the first Claude Code release (it was a Sonnet 4.5 claim).
Open items
- Funding figures for the Nscale, AMD, Akamai and xAI deals, and the Bun acquisition date, rest on Wikipedia only.
- IPO outcome after 2026-06 is unknown.
Sources
- TechCrunch, Series H: https://techcrunch.com/2026/05/28/anthropic-raises-65-billion-nears-1t-valuation-ahead-of-ipo/ (fetched 2026-10-05)
- Microsoft, NVIDIA and Anthropic partnership: https://blogs.microsoft.com/blog/2025/11/18/microsoft-nvidia-and-anthropic-announce-strategic-partnerships/ (search result summary, 2026-10-05)
- MCP donation: https://anthropic.com/news/donating-the-model-context-protocol-and-establishing-of-the-agentic-ai-foundation (search result, 2026-10-05)
- Pentagon appeal: https://www.cnbc.com/2026/09/25/pentagon-anthropic-ai-risk-appeals-court.html (search result, 2026-10-05)
- Wikipedia (secondary): https://en.wikipedia.org/wiki/Anthropic (fetched 2026-10-05)
- Model details come from the vault notes linked above, verified 2026-09-30 against Anthropic docs.