When was Anthropic Claude Sonnet 4.6 released?

Anthropic Claude Sonnet 4.6 was released on 2026-02-17.

What is the context window of Claude Sonnet 4.6?

Claude Sonnet 4.6 supports a context window of 500K tokens.

Claude Sonnet 4.6 pricing is $3.00 per 1M input tokens and $15.00 per 1M output tokens.

Claude Sonnet 4.6 is available via API Only on Anthropic API, AWS Bedrock, Google Vertex AI.

Major Release Anthropic LLM Proprietary

Name: Anthropic Claude Sonnet 4.6
Availability: API Only
Author: Anthropic

Near-Opus quality at a fraction of the cost, with Agent Teams orchestration.

Released 2026-02-17 · ~500B · 500K tokens context · knowledge cutoff 2025-10

Anthropic's latest Sonnet with Agent Teams capability and near-Opus performance at a fraction of the cost

DeveloperAnthropic

Release date2026-02-17

Model typeLLM

Parameters~500B

ArchitectureDense Transformer (proprietary)

Context window500K tokens

Max output64K

Knowledge cutoff2025-10

LicenseProprietary

Input modalitiestext, image, PDF

Output modalitiestext

Benchmark	Claude Sonnet 4.6	Claude Sonnet 4	Δ
SWE-bench	80.8%	—	—
MMLU	92.1%	88.7%	+3.4
HumanEval	95.2%	94.5%	+0.7
SWE-bench Verified	80.8%	72.3%	+8.5
GPQA Diamond	78.4%	74.0%	+4.4
AIME 2025	88.5%	—	—
TAU-bench	71.2%	—	—

$3.00

per 1M input tokens

$15.00

per 1M output tokens

$0.30

per 1M cached input tokens

API Only Anthropic API AWS Bedrock Google Vertex AI

Direct comparison available in the model comparison tool →