When was Anthropic Claude Sonnet 4 released?

Anthropic Claude Sonnet 4 was released on 2025-05-22.

What is the context window of Claude Sonnet 4?

Claude Sonnet 4 supports a context window of 200K tokens.

Claude Sonnet 4 pricing is $3.00 per 1M input tokens and $15.00 per 1M output tokens.

Claude Sonnet 4 is available via API Only on Anthropic API, AWS Bedrock, Google Vertex AI.

Major Release Anthropic LLM Proprietary

Name: Anthropic Claude Sonnet 4
Availability: API Only
Author: Anthropic

Claude 4 mid-tier with strong coding and long-horizon agentic reliability.

Released 2025-05-22 · ~500B · 200K tokens context · knowledge cutoff 2025-03

Latest generation Claude model with significant performance improvements

DeveloperAnthropic

Release date2025-05-22

Model typeLLM

Parameters~500B

ArchitectureDense Transformer (proprietary)

Context window200K tokens

Max output64K

Knowledge cutoff2025-03

LicenseProprietary

Input modalitiestext, image, PDF

Output modalitiestext

$3.00

per 1M input tokens

$15.00

per 1M output tokens

API Only Anthropic API AWS Bedrock Google Vertex AI