AI safety company building reliable, interpretable, and steerable AI systems using Constitutional AI.
Anthropic
Claude Opus 4 is Anthropic's most powerful model and the best coding model in the world, leading on SWE-bench (72.5%) and Terminal-bench (43.2%). It delivers sustained performance on long-running tasks that require focused effort and thousands of steps, with the ability to work continuously for several hours. Features include extended thinking with tool use, parallel tool execution, improved memory capabilities, and significantly reduced shortcut behaviors.
Claude Sonnet 4 significantly improves on Sonnet 3.7's capabilities, excelling in coding with a state-of-the-art 72.7% on SWE-bench. The model balances performance and efficiency, with enhanced steerability for greater control over implementations. Features include extended thinking with tool use, parallel tool execution, improved instruction following, and significantly reduced shortcut behaviors.
Anthropic's most intelligent model to date and the first hybrid reasoning model on the market. Claude 3.7 Sonnet can produce near-instant responses or extended, step-by-step thinking that is made visible to the user. API users have fine-grained control over how long the model can think for (up to 128K tokens). Priced at $3 per million input tokens and $15 per million output tokens at launch, including thinking tokens.
Anthropics fastest model at time of launch, delivering intelligence at blazing speeds. Claude 3.5 Haiku is optimized for quick responses while maintaining high quality.
Claude 3.5 Sonnet raises the industry bar for intelligence, outperforming competitor models and Claude 3 Opus on a wide range of evaluations, with the speed and cost of a mid-tier model. It operates at twice the speed of Claude 3 Opus.
Anthropic's fastest and most compact model at the time of launch with near-instant responsiveness. Answers simple queries and requests with unmatched speed while maintaining good quality. Pricing at launch: $0.25 per million input tokens, $1.25 per million output tokens.
Anthropic's most intelligent model at release, with best-in-market performance on highly complex tasks. It can navigate open-ended prompts with remarkable fluency and human-like understanding. Pricing at launch: $15 per million input tokens, $75 per million output tokens.
Anthropic's balanced model that strikes an ideal balance between intelligence and speed for enterprise workloads. Delivers strong performance at a lower cost compared to its peers. Pricing at launch: $3 per million input tokens, $15 per million output tokens.
Major update to Claude 2 featuring an industry-leading 200K token context window (roughly 150,000 words or 500+ pages), 2x reduction in hallucination rates, system prompts support, and beta tool use capabilities for API integration.
Anthropic's most capable system at release, representing a continuous evolution from previous Claude models. Trained via unsupervised learning, RLHF, and Constitutional AI with both supervised and reinforcement learning phases. Features improved helpfulness, honesty, and harmlessness (HHH) with enhanced coding abilities, longer output generation up to 4000 tokens, and better structured data formatting capabilities.
Anthropic's first-generation AI assistant, built on research into training helpful, honest, and harmless AI systems. Claude was designed for conversational and text processing tasks with enhanced safety features, reduced harmful outputs, and improved steerability compared to earlier language models. Claude v1 introduced Constitutional AI training methods that became foundational to Anthropic's approach.
