Claude
Free tierAnthropic's safety-focused AI assistant — exceptional at long documents and nuanced reasoning.
Free tier available·All audiences·Powered by Anthropic·API available
Key strengths
200K context windowcodinglong document analysisinstruction following
Free tier + paid plans · from $20 USD/mo
San Francisco, US
Founded 2021
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Claude is built on Anthropic's Claude 3.x/4.x model family. Key technical differentiators: 200K token context window, Constitutional AI training for safety, and structured output via tool_use. The API is REST-based and fully streaming-capable.
import anthropic
client = anthropic.Anthropic()
msg = client.messages.create(
model="claude-opus-4-5",
max_tokens=1024,
messages=[{"role": "user", "content": "Explain RLHF."}]
)
print(msg.content[0].text)