The Model Router System intelligently selects the most appropriate LLM for each task based on requirements, capabilities, and cost considerations, ensuring optimal performance and resource utilization.

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Quick Start

1

Install Package

First, install the Praison Labs Agents package:

pip install praisonaiagents
2

Set API Keys

Set your API keys as environment variables:

export OPENAI_API_KEY=your_openai_key_here
export ANTHROPIC_API_KEY=your_anthropic_key_here
export GOOGLE_API_KEY=your_google_key_here
3

Create a file

Create a new file model_router_example.py: 

from praisonaiagents import Agent, Task, Praison LabsAgents
from praisonaiagents.llm import ModelRouter

# Initialize the model router
router = ModelRouter()

# Create an agent with automatic model selection
smart_agent = Agent(
    name="Smart Assistant",
    role="Adaptive AI Assistant",
    goal="Complete tasks using the most appropriate model",
    instructions="Analyze task requirements and use the best model",
    llm=router  # Model router will select the best model
)

# Create tasks with different requirements
simple_task = Task(
    name="simple_calculation",
    description="Calculate the sum of 15 + 27",
    expected_output="The numerical result",
    agent=smart_agent
)

complex_task = Task(
    name="complex_reasoning",
    description="Analyze the implications of quantum computing on cryptography",
    expected_output="Detailed analysis with multiple perspectives",
    agent=smart_agent
)

long_context_task = Task(
    name="document_analysis",
    description="Summarize this 50-page research paper",
    expected_output="Comprehensive summary with key findings",
    agent=smart_agent,
    context_length=50000  # Triggers selection of long-context model
)

# Create and run workflow
workflow = Praison LabsAgents(
    agents=[smart_agent],
    tasks=[simple_task, complex_task, long_context_task],
    verbose=True
)

print("Starting Model Router Workflow...")
print("=" * 50)

results = workflow.start()

# Display which models were selected
for task_name, model_used in router.get_routing_history().items():
    print(f"Task: {task_name} -> Model: {model_used}")
4

Run the Example

Execute your model router example:

python model_router_example.py

Requirements

  • Python 3.10 or higher
  • API keys for the models you want to use
  • Basic understanding of different LLM capabilities

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Understanding Model Router

What is Model Router?

The Model Router:

  • Automatically selects the best LLM for each task
  • Considers task complexity, context length, and requirements
  • Optimizes for performance and cost
  • Supports fallback options if primary model fails
  • Provides detailed routing history and analytics

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Features

Intelligent Selection

Analyzes task requirements to choose the optimal model.

Cost Optimization

Balances performance needs with cost considerations.

Capability Matching

Matches task requirements with model capabilities.

Fallback Support

Automatically switches to backup models if needed.

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Configuration Options 

# Initialize router with custom configuration
router = ModelRouter(
    config={
        # Model selection preferences
        "prefer_cost_effective": True,
        "max_cost_per_token": 0.001,
        
        # Model capabilities
        "model_capabilities": {
            "gpt-4": {
                "max_tokens": 128000,
                "strengths": ["reasoning", "coding", "analysis"],
                "cost_per_1k_tokens": 0.03
            },
            "gpt-3.5-turbo": {
                "max_tokens": 16000,
                "strengths": ["general", "fast"],
                "cost_per_1k_tokens": 0.001
            },
            "claude-3-sonnet": {
                "max_tokens": 200000,
                "strengths": ["long_context", "writing"],
                "cost_per_1k_tokens": 0.015
            }
        },
        
        # Routing rules
        "routing_rules": {
            "complex_reasoning": ["gpt-4", "claude-3-opus"],
            "simple_tasks": ["gpt-3.5-turbo", "llama-3"],
            "long_context": ["claude-3-sonnet", "gpt-4-turbo"],
            "coding": ["gpt-4", "deepseek-coder"],
            "multimodal": ["gpt-4-vision", "gemini-pro-vision"]
        },
        
        # Fallback configuration
        "fallback_enabled": True,
        "fallback_models": ["gpt-3.5-turbo", "llama-3"]
    }
)

# Use router with specific task hints
result = router.route_task(
    task_description="Analyze complex financial data",
    requirements={
        "complexity": "high",
        "domain": "finance",
        "expected_tokens": 2000
    }
)

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Advanced Usage

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Custom Routing Logic 

from praisonaiagents.llm import ModelRouter, RoutingCriteria

class CustomRouter(ModelRouter):
    def custom_routing_logic(self, task, criteria):
        # Add custom logic for specific use cases
        if "legal" in task.description.lower():
            return "claude-3-opus"  # Better for legal documents
        
        if criteria.urgency == "high":
            return "gpt-3.5-turbo"  # Fastest response
        
        return super().route(task, criteria)

# Use custom router
custom_router = CustomRouter()

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Routing Analytics 

# Get routing statistics
stats = router.get_statistics()
print(f"Total tasks routed: {stats['total_tasks']}")
print(f"Model usage breakdown: {stats['model_usage']}")
print(f"Average cost per task: ${stats['avg_cost']}")
print(f"Performance metrics: {stats['performance']}")

# Export routing history
router.export_history("routing_history.json")

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Model Selection Criteria

The router considers multiple factors when selecting models:

Task Complexity

  • Simple calculations → Cost-effective models
  • Complex reasoning → Advanced models
  • Creative tasks → Specialized creative models

Context Length

  • Short context → Standard models
  • Medium context → Enhanced context models
  • Long context → Specialized long-context models

Response Time

  • Real-time needs → Fast models
  • Batch processing → Optimized for throughput
  • Quality priority → Best performing models

Cost Constraints

  • Budget limits → Cost-effective options
  • Quality/cost balance → Optimal value models
  • Premium requirements → Top-tier models

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Best Practices

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Troubleshooting

Routing Issues

If wrong models are selected:

  • Review task requirements
  • Check routing rules configuration
  • Enable verbose logging
  • Verify model availability

Performance Problems

If performance is suboptimal:

  • Analyze routing history
  • Adjust selection criteria
  • Update model capabilities
  • Consider custom routing logic

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Next Steps

Model Capabilities

Deep dive into model-specific capabilities and features

Router Agent

Learn about the RouterAgent for dynamic task routing

The Model Router System continuously learns from usage patterns to improve selection accuracy over time. Regular monitoring and adjustment of routing rules ensures optimal performance.