When was Anthropic Claude Opus 4.1 released?

Anthropic Claude Opus 4.1 was released on 2025-07-15.

What is the context window of Claude Opus 4.1?

Claude Opus 4.1 supports a context window of 200K tokens.

Claude Opus 4.1 pricing is $15.00 per 1M input tokens and $75.00 per 1M output tokens.

Claude Opus 4.1 is available via API Only on Anthropic API, AWS Bedrock, Google Vertex AI.

Update Anthropic LLM Proprietary

Name: Anthropic Claude Opus 4.1
Availability: API Only
Author: Anthropic

Mid-2025 Opus refresh focused on agentic coding reliability.

Released 2025-07-15 · ~500B · 200K tokens context · knowledge cutoff 2025-03

Iterative improvement on Claude Opus 4 with enhanced multi-file refactoring

DeveloperAnthropic

Release date2025-07-15

Model typeLLM

Parameters~500B

ArchitectureDense Transformer (proprietary)

Context window200K tokens

Max output32K

Knowledge cutoff2025-03

LicenseProprietary

Input modalitiestext, image, PDF

Output modalitiestext

$15.00

per 1M input tokens

$75.00

per 1M output tokens

API Only Anthropic API AWS Bedrock Google Vertex AI