Anthropic API
The Anthropic API is the developer interface for Anthropic's Claude family of large language models, a Messages-based HTTP service hosted at for building conversational AI applications, AI agents, and…
Large Language Models
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Claude (language model)
Claude is a family of large language models (LLMs) developed by Anthropic, an American artificial intelligence safety and research company.
Claude 1
Claude 1 was the first generation of Anthropic's Claude family of large language models, launched in March 2023 and offered in two variants: a full-sized model called simply Claude and a faster
Claude 2
Claude 2 is a large language model released by Anthropic on July 11, 2023, the second major version of the company's Claude family of conversational AI systems and the first Claude model offered directly to…
Claude 2.1
Claude 2.1 is a large language model released by Anthropic on November 21, 2023, as an incremental update to Claude 2.
Claude 3 Haiku
Claude 3 Haiku is the fastest and most compact model in the Claude 3 family, a generation of large language models released by Anthropic in March 2024.
Claude 3 Opus
Claude 3 Opus is a large language model developed by Anthropic and released on March 4, 2024 as the flagship of the Claude 3 family.
Claude 3 Sonnet
Claude 3 Sonnet is the balanced mid-tier large language model in Anthropic's Claude 3 family, released on March 4, 2024 alongside the more powerful Claude 3 Opus and the smaller, faster Claude 3 Haiku.
Claude 3.5 Haiku
Claude 3.5 Haiku is a fast, low-cost large language model developed by Anthropic, announced on October 22, 2024 and released through the Claude API on November 4, 2024 as the smallest and most affordable…
Claude 3.5 Sonnet
Claude 3.5 Sonnet was a proprietary multimodal large language model developed by Anthropic.
Claude 3.7 Sonnet
Claude 3.7 Sonnet is a large language model developed by Anthropic and released on February 24, 2025
Claude 4
Claude 4 is the fourth-generation family of large language models developed by Anthropic, an American AI safety company.
Claude Fable 5
Claude Fable 5 is a large language model developed by Anthropic and released on June 9, 2026, as the first publicly available model in a new "Mythos class" that the company describes as "a tier of Claude…
Claude Fable 5.1
Claude Fable 5.1 is a large language model developed by Anthropic and released on September 1, 2026 as the successor to Claude Fable 5 in the company's Mythos-class tier
Claude Haiku 4.5
Claude Haiku 4.5 is a small, fast large language model developed by Anthropic and released on October 15, 2025, as the lightweight, high-speed member of the Claude 4.5 model family.
Claude Instant
Claude Instant was Anthropic's fast, low-cost line of large language models, offered through the Anthropic API from March 2023 to November 2024 as the lightweight counterpart to the flagship Claude models.
Claude Mythos 5
Claude Mythos 5 is a large language model released by Anthropic on June 9, 2026 as the restricted top tier of its Claude family.
Claude Mythos 5.1
Claude Mythos 5.1 is the restricted-access deployment of the large language model that Anthropic released on September 1, 2026, alongside its generally available twin, Claude Fable 5.1.
Claude Mythos Preview
Claude Mythos Preview, usually shortened to Mythos, is a frontier language model developed by Anthropic and announced on April 7, 2026.
Claude Opus 4
Claude Opus 4 is a large language model released by Anthropic on May 22, 2025 as the flagship of the Claude 4 generation, billed at launch as "the world's best coding model" and the first Anthropic model…
Claude Opus 4.1
Claude Opus 4.1 is a large language model developed by Anthropic and released on August 5, 2025.
Claude Opus 4.5
Claude Opus 4.5 is a large language model developed by Anthropic and released on November 24, 2025.
Claude Opus 4.6
Claude Opus 4.6 is a large language model developed by Anthropic and released on February 5, 2026, positioned at launch as the company's most capable generally available model for long-horizon agentic work…
Claude Opus 4.7
Claude Opus 4.7 is a hybrid reasoning large language model released by Anthropic on April 16, 2026 as the company's most capable generally available model at launch.
Claude Opus 4.8
Claude Opus 4.8 is a large language model developed by Anthropic, released on May 28, 2026 as the most capable generally available member of the company's Claude 4 line at launch.
Claude Opus 5
Claude Opus 5 is a large language model released by Anthropic on 24 July 2026, the newest entry in the Claude Opus line and the successor to Claude Opus 4.8.
Claude Sonnet 4
Claude Sonnet 4 is a multimodal hybrid-reasoning large language model developed by Anthropic and released on May 22, 2025.
Claude Sonnet 4.5
Claude Sonnet 4.5 is a multimodal large language model (LLM) developed by Anthropic and released on September 29, 2025, which Anthropic described at launch as "the best coding model in the world." It is a…
Claude Sonnet 4.6
Claude Sonnet 4.6 is a large language model developed by Anthropic and released on February 17, 2026.
Claude Sonnet 5
Claude Sonnet 5 is a large language model developed by Anthropic, released on June 30, 2026 as the mid-tier, default member of the current Claude lineup.
Many-shot jailbreaking
Many-shot jailbreaking is a technique for bypassing the safety training of a large language model by filling its context window with a long series of faux dialogue turns in which an AI assistant complies with…