Anthropic
United StatesModel developerFirst-party API
Safety-focused lab behind the Claude model family.
What they do
Anthropic, founded in 2021 by former OpenAI researchers, builds the Claude family — Haiku (fast/cheap), Sonnet (balanced) and Opus (most capable), plus specialty lines like Fable. Newer Claude models use 'adaptive reasoning', deciding how much thinking a problem needs, with effort levels from low to max. Known for Constitutional AI and strong writing/coding ability.
Models they develop
34 in this directory.
- Claude 2.0AnthropicOlder models
- Claude 2.1AnthropicOlder models
- Claude 3 HaikuAnthropicOlder models
- Claude 3 OpusAnthropicOlder models
- Claude 3 SonnetAnthropicOlder models
- Claude 3.5 HaikuAnthropicOlder models
- Claude 3.5 Sonnet (June '24)AnthropicOlder models
- Claude 3.5 Sonnet (Oct '24)AnthropicOlder models
- Claude 3.7 Sonnet (Non-reasoning)AnthropicOlder models
- Claude 3.7 Sonnet (Reasoning)AnthropicOlder models
- Claude 4 Opus (Non-reasoning)AnthropicOlder models
- Claude 4 Opus (Reasoning)AnthropicOlder models
- Claude 4 Sonnet (Non-reasoning)AnthropicOlder models
- Claude 4 Sonnet (Reasoning)AnthropicOlder models
- Claude 4.1 Opus (Non-reasoning)AnthropicOlder models
- Claude 4.1 Opus (Reasoning)AnthropicOlder models
- Claude 4.5 Haiku (Non-reasoning)AnthropicFrontier
- Claude 4.5 Haiku (Reasoning)AnthropicFrontier
- Claude 4.5 Sonnet (Non-reasoning)AnthropicFrontier
- Claude 4.5 Sonnet (Reasoning)AnthropicFrontier
- Claude Fable 5 (Adaptive Reasoning, Opus 4.8 Fallback)AnthropicFrontier
- Claude InstantAnthropicOlder models
- Claude Opus 4.5 (Non-reasoning)AnthropicFrontier
- Claude Opus 4.5 (Reasoning)AnthropicFrontier
- Claude Opus 4.6 (Adaptive Reasoning)AnthropicFrontier
- Claude Opus 4.6 (Non-reasoning)AnthropicFrontier
- Claude Opus 4.7 (Adaptive Reasoning)AnthropicFrontier
- Claude Opus 4.7 (Non-reasoning)AnthropicFrontier
- Claude Opus 4.8 (Adaptive Reasoning)AnthropicFrontier
- Claude Opus 5 (Adaptive Reasoning)AnthropicFrontier
- Claude Sonnet 4.6 (Adaptive Reasoning)AnthropicFrontier
- Claude Sonnet 4.6 (Non-reasoning)AnthropicFrontier
- Claude Sonnet 5 (Adaptive Reasoning)AnthropicFrontier
- Claude Sonnet 5 (Non-reasoning)AnthropicFrontier