Claude Sonnet 5 API

US Anthropic | released 2026-05 | knowledge cutoff 2026-03

Claude Sonnet 5 is Anthropic’s balanced model, widely regarded as a top choice for coding, long-context analysis, and careful reasoning. It produces clean, well-structured output and follows complex instructions reliably.

ImageReasoningCodeTool UseJSON ModeFlagship

Pricing (official list, per 1M tokens)

Input

$3.00/M

Output

$15.00/M

Specifications

Context window1000K tokens Max output16.384K tokens Input modalitiesImage StreamingYes APIOpenAI-compatible

How to use Claude Sonnet 5

Drop-in OpenAI replacement. Change only the base_url and model.

# Python -pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://meshtok.com/v1",
    api_key="sk-your-MeshTok-key",
)

resp = client.chat.completions.create(
    model="anthropic/claude-sonnet-5",
    messages=[{"role":"user","content":"Hello!"}],
)
print(resp.choices[0].message.content)

# cURL
curl https://meshtok.com/v1/chat/completions \
  -H "Authorization: Bearer sk-your-MeshTok-key" \
  -H "Content-Type: application/json" \
  -d '{"model":"anthropic/claude-sonnet-5","messages":[{"role":"user","content":"Hello!"}]}'