When was Anthropic Claude Opus 4.5 released?

Anthropic Claude Opus 4.5 was released on 2025-11-24.

What is the context window of Claude Opus 4.5?

Claude Opus 4.5 supports a context window of 500K tokens.

Claude Opus 4.5 pricing is $15.00 per 1M input tokens and $75.00 per 1M output tokens.

Claude Opus 4.5 is available via API Only on Anthropic API, AWS Bedrock, Google Vertex AI.

Major Release Anthropic LLM Proprietary

Name: Anthropic Claude Opus 4.5
Availability: API Only
Author: Anthropic

Anthropic's top-tier reasoning model for complex research and agents.

Released 2025-11-24 · ~500B · 500K tokens context · knowledge cutoff 2025-08

Anthropic's most capable model with breakthrough coding performance and major price reduction

DeveloperAnthropic

Release date2025-11-24

Model typeLLM

Parameters~500B

ArchitectureDense Transformer (proprietary)

Context window500K tokens

Max output64K

Knowledge cutoff2025-08

LicenseProprietary

Input modalitiestext, image, PDF

Output modalitiestext

Benchmark	Claude Opus 4.5	Claude Opus 4.1	Δ
SWE-bench	80.9%	75.2%	+5.7
MMLU	92.8%	91.2%	+1.6
HumanEval	95.0%	94.0%	+1.0
SWE-bench Verified	78.9%	74.5%	+4.4
GPQA Diamond	82.4%	79.1%	+3.3
AIME 2025	90.5%	—	—

$15.00

per 1M input tokens

$75.00

per 1M output tokens

$1.50

per 1M cached input tokens

API Only Anthropic API AWS Bedrock Google Vertex AI