Anthropic model
Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Tool callingJSON modeLong contextReasoningStreamingVision
Best use cases
- coding agents
- code review
- complex writing
- long-document analysis
OpenAI-compatible code example
Keep the OpenAI SDK style, set base_url to NextModel, and use the catalog model ID claude-sonnet-4-5.
Python
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://api.nextmodel.app/v1"
)
resp = client.chat.completions.create(
model="claude-sonnet-4-5",
messages=[{"role": "user", "content": "Hello from NextModel"}]
)
print(resp.choices[0].message.content)Similar alternatives
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FAQ
Anthropic: Claude Sonnet 4.5 API questions
Is Claude Sonnet 4.5 a good coding model?
Yes. It is listed as a high-quality coding and agent candidate because of its long context and instruction-following profile.