Anthropic — Foundation Models Platform

Foundation ModelsLayer 4Usage-based

Founded 2021|San Francisco, California|1001-5000

What is Anthropic?

Anthropic is an AI safety and research company that builds the Claude family of large language models. Founded in 2021 by Dario Amodei (CEO) and Daniela Amodei (President), along with five other former OpenAI employees, the company is structured as a Public Benefit Corporation with a Long-Term Benefit Trust to prioritize societal benefit.

Claude models are known for strong reasoning capabilities, large context windows (up to 200K tokens), and an emphasis on safety and reliability. Claude Sonnet 4.5 leads as the top coding model with 77.2% on SWE-bench Verified, while the three-tier pricing system (Haiku, Sonnet, Opus) provides flexibility for different use cases. Anthropic pioneered Constitutional AI and created the Model Context Protocol (MCP), now an industry standard for AI tool integration donated to the Linux Foundation.

The company serves enterprise customers through both its API platform and the Claude.ai consumer product. Claude has grown from 2.9 million monthly users in January 2024 to 18.9 million by early 2025, with $850 million in annualized revenue. As of February 2026, Anthropic is valued at approximately $380 billion and employs roughly 2,000-4,000 people across its San Francisco headquarters.

Key Features

✓Claude 4 and Claude 3.5 Sonnet models
✓200K token context window
✓Computer use and tool use capabilities
✓Strong safety and instruction following
✓Claude Code for autonomous coding

Pros & Cons

Pros

+Industry-leading instruction-following and reasoning capabilities
+Top-ranked coding model (Sonnet 4.5 at 77.2% SWE-bench)
+Large 200K context window for long-document analysis
+Strong safety focus with lower hallucination rates
+Flexible three-tier pricing from $1 to $75 per MTok

Cons

-No native image generation capabilities
-Smaller training corpus than some competitors
-Ecosystem integration less mature than OpenAI
-Limited public transparency about model updates and version changes

Anthropic Pricing

Free trial available

Haiku 4.5$1/$5 per MTok (input/output)

✓Fastest model
✓Best for high-volume tasks
✓Low-latency responses

Sonnet 4.5$3/$15 per MTok (input/output)

✓Best coding model
✓Balanced performance and cost
✓200K context window

Opus 4.6$15/$75 per MTok (input/output)

✓Most capable model
✓Complex reasoning tasks
✓Extended thinking

View official pricing page

Common Use Cases

Developers and enterprises who need reliable, safe, and capable AI for production applications

•Long document analysis and summarization
•Complex reasoning and research tasks
•Autonomous coding and software engineering
•Safe customer-facing AI applications
•Enterprise workflow automation

Using Anthropic with Respan

Respan provides a unified gateway for Anthropic Claude API calls alongside 250+ other LLMs. Teams can route requests through Respan to monitor Claude usage, compare model performance, and enable automatic fallback between Claude and other providers for maximum reliability.