Anthropic model
Claude Sonnet 4.5
Anthropic: Claude Sonnet 4.5 is a Anthropic model listed in the NextModel catalog for coding agents, code review, complex writing workloads. Its listed price is $3 / 1M tokens input and $15 / 1M tokens output per 1M tokens, with a 1M token context window.
Tool callingJSON modeLong contextReasoningStreamingVision
What is Claude Sonnet 4.5 in NextModel?
Anthropic: Claude Sonnet 4.5 is a Anthropic model listed in the NextModel catalog for coding agents, code review, complex writing workloads. Its listed price is $3 / 1M tokens input and $15 / 1M tokens output per 1M tokens, with a 1M token context window.
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
AnthropicCatalog
Opus 4.7 is the next generation of Anthropic's Opus family, built for long-running, asynchronous agents. Building on the coding and agentic strengths of Opus 4.6, it delivers stronger performance on...
Best forfrontier reasoning, large codebase review, strategy analysis
RoutingConfigured
Tool callingJSON modeLong contextReasoning
OpenRouter if availableOpenRouter public Models API live metadata; public price comes from the registry pricing rule
GoogleCatalog
Gemini 2.5 Pro is Google’s state-of-the-art AI model designed for advanced reasoning, coding, mathematics, and scientific tasks. It employs “thinking” capabilities, enabling it to reason through responses with enhanced accuracy...
Best forlong-context analysis, vision workflows, scientific reasoning
RoutingConfigured
Tool callingVisionJSON modeLong context
OpenRouter if availableOpenRouter public Models API live metadata; public price comes from the registry pricing rule
DeepSeekCatalog
DeepSeek R1 is here: Performance on par with [OpenAI o1](/openai/o1), but open-sourced and with fully open reasoning tokens. It's 671B parameters in size, with 37B active in an inference pass....
Best forChinese reasoning, math, analysis
RoutingConfigured
JSON modeLong contextReasoningStreaming
OpenRouter if availableOpenRouter public Models API live metadata; public price comes from the registry pricing rule
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.