Anthropic Models

Second model of the Claude 5.5 family. Anthropic reports over 30% faster output and up to 30% lower cost per task than Sonnet 5 at the same $2/$10 pricing.

Claude 5.5 model for agentic coding and knowledge work. Independent measurements track max effort with default safeguards and fallback behavior.

Anthropic's strongest generally available model for long-running coding, research, and knowledge work, with Mythos-level capability and adaptive reasoning.

Anthropic's Claude 5 flagship. New ARC-AGI-2 state of the art at 97.1%, and the first model to post a meaningful ARC-AGI-3 score (30.2%).

First Sonnet of the Claude 5 generation. Terminal-Bench 2.1 80.4% and GDPval-AA v2 parity with Opus 4.8 (1618 vs 1615) at Sonnet-tier cost.

First public Mythos-class model, a tier above Opus, with strong reasoning, coding, and long-horizon professional-work performance.

Frontier Anthropic model with strong coding, reasoning, and professional-work performance.

1M context, stronger coding and vision. SWE-bench Pro 64.3% beats GPT-5.4 and Gemini 3.1 Pro.

Opus-level performance at one-fifth the cost, default model on claude.ai

1M context with parallel agent teams, #1 on Arena Elo at 1504

First model to break 80% on SWE-bench Verified

Haiku-tier model matching Sonnet 4 on coding at one-third the cost

First Sonnet to score 100% on AIME, closed the Opus gap entirely

Improved agentic reliability with better tool use and planning

Strongest agentic model at launch, sustained multi-hour autonomous coding

Matched Opus 4 on coding at one-fifth the price, 1M context window

First hybrid reasoning model, extended thinking mode for complex problems

Best coding model of 2024, dominated SWE-bench for months

First Claude to match GPT-4, introduced the Opus/Sonnet/Haiku tier system

First Claude with 100K context, established Anthropic as a frontier lab