Claude Sonnet 5

[reasoning]

Anthropic[text]

Most agentic Sonnet yet, near-Opus 4.8 performance at a fraction of the cost (intro pricing $2/$10 through Aug 31)

Input

per 1M tokens

Output

$15

per 1M tokens

Cached

$0.30

per 1M tokens

Context

1M tokens

Max Output

128K tokens

Released

2026-06-30

Features

[optional-reasoning][1m-tokens-context][near-opus-4.8-performance][autonomous-task-execution][self-checking-output][prompt-caching-90%-discount]

Technical Specifications

Benchmarks

ARC-AGI-284.7%

GPQA Diamond96.2%

OSWorld-Verified88.3%

SWE-bench Verified92.4%

The Lab

location: San Francisco, California, USAfounded: 2021backed by: Amazon, Google; public benefit corporation

Founded in 2021 by former OpenAI researchers and headquartered in San Francisco, Anthropic is a public benefit corporation backed by Amazon and Google. The lab pursues safety-first AI research using Constitutional AI to align models with human values. Its flagship Claude family emphasises long-context understanding, nuanced instruction-following, and steerable behaviour.

more about Anthropic →

Model ID: claude-sonnet-5