Claude Sonnet 4.5 - Starrise AI

Claude Sonnet 4.5 is Anthropic’s best coding model, available through Starrise AI via OpenAI-compatible interface. It strikes an excellent balance between speed and capability, excelling at code generation, analysis, writing, and complex reasoning tasks.

Key Capabilities

OpenAI-compatible — Drop-in replacement for the OpenAI SDK, no other code changes needed
Best coding model — Top-performing for code generation, refactoring, and debugging
Fast and powerful — Perfect balance of speed and performance
Long context — Supports large document processing and multi-turn conversations
Streaming — Real-time token streaming via SSE
Strong reasoning — Ideal for complex multi-step tasks

Quick Example

curl https://ai.alad.com/v1/messages \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5-20250929",
    "messages": [
      { "role": "user", "content": "Explain quantum entanglement in simple terms." }
    ]
  }'

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://ai.alad.com/v1"
)

response = client.chat.completions.create(
    model="claude-sonnet-4-5-20250929",
    messages=[
        {"role": "user", "content": "Explain quantum entanglement in simple terms."}
    ]
)

print(response.choices[0].message.content)

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://ai.alad.com/v1"
)

stream = client.chat.completions.create(
    model="claude-sonnet-4-5-20250929",
    messages=[
        {"role": "user", "content": "Write a short poem about the ocean."}
    ],
    stream=True
)

for chunk in stream:
    print(chunk.choices[0].delta.content or "", end="")

Parameters

Parameter	Type	Required	Description
`model`	string	Yes	Fixed value: `claude-sonnet-4-5-20250929`
`messages`	array	Yes	Array of `{ role, content }` objects
`max_tokens`	integer	No	Maximum number of tokens to generate
`temperature`	float	No	`0`–`2`, controls randomness, default `1`
`stream`	boolean	No	Enable SSE streaming, default `false`
`top_p`	float	No	Nucleus sampling threshold, default `1`
`stop`	string / array	No	Sequences where generation stops

API Reference

View the interactive API Playground for Claude Sonnet 4.5.