Claude Sonnet 4.6

Anthropic

balanced

Capabilities

VisionToolsCodeLong ContextExtended ThinkingStructured OutputMultilingual

Strengths

Best balance of cost/speed/quality at Anthropic
128K max output
Strong instruction following

Weaknesses

Not the cheapest for simple tasks

Pricing

Input / 1M tokens

Output / 1M tokens

$15

Context window

1,000k

Transparency

Open weights

0.0 / 10

Open training data

0.0 / 10

Open methodology

5.0 / 10

Licence openness

3.0 / 10

Provider disclosure

4.0 / 10

FMTI company score

370.0 / 10

Composite:2.4 / 10

Anthropic FMTI 37. No transparency report submitted. Publishes model cards. No training data disclosure.

Sustainability

Inference energy

N/A

Training footprint

N/A

Provider infrastructure

4.0 / 10

Composite:4.0 / 10

Anthropic committed to covering 100% grid upgrade costs, water-efficient cooling, energy price offset for ratepayers. No renewable energy target published.

Task Fitness

question answering

88%

code

90%

mathematics

89%

business communication

77%

analysis

88%

extraction

88%

long-form generation

90%

research

62%

reasoning

88%

summarisation

88%

translation

82%

conversation

88%