Anthropic models

Anthropic is a San Francisco AI safety and research company that develops the Claude models. Its current lineup is Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5 and Claude Haiku 5.5, all with 1M-token context windows, while Claude Mythos 5.1 is reserved for organizations in its verification programs. Developers can call Claude through the Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS, and consumers use it in the Claude apps.

5 models trackedData checked October 10, 2026

Lineup

Model	Status	Weights	Tier	Context	Input / 1M	Output / 1M	Released
Claude Fable 5.1Claude 5	Current	Closed	Frontier	1M	$10	$50	Sep 1, 2026
Claude Opus 5.5Claude 5	Current	Closed	Frontier	1M	$4	$20	Sep 22, 2026
Claude Sonnet 5.5Claude 5	Current	Closed	Advanced	1M	$2	$10	Sep 28, 2026
Claude Haiku 5.5Claude 5	Current	Closed	Efficient	1M	$0.10	$0.50	Oct 7, 2026
Claude Opus 5Claude 5	Legacy	Closed	Frontier	1M	$5	$25	Jul 24, 2026

The lowest-priced current model is Claude Haiku 5.5 at $0.10 input and $0.50 output per million tokens. The most capable tier in the lineup is frontier, led by Claude Fable 5.1. The longest context window is 1M tokens (Claude Fable 5.1).

Frequently asked questions

What models does Anthropic offer?

As of October 10, 2026, we track 5 Anthropic models: Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, Claude Haiku 5.5, Claude Opus 5. Status, prices and context windows for each are in the table on this page.

How do I access Anthropic models?

Through Anthropic's developer platform (platform.claude.com/docs), in the Claude app, and for many models through cloud marketplaces and inference providers listed on each model page.

Does Anthropic release open-weight models?

Other providers

OpenAI Google xAI Amazon (AWS)Meta Perplexity Mistral AI DeepSeek Alibaba (Qwen)Microsoft (Phi)NVIDIA Moonshot AI Z.ai (Zhipu AI)MiniMax IBM Ai2 (Allen Institute for AI)

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