Model Availability

Model Availability Status

Laozhang API provides multiple mainstream AI models, availability status updated in real-time.

Currently Available Models

OpenAI Series
Anthropic Series
Google Series
Image Generation
Video Generation

Model	Status	Features	Use Cases
GPT-4 Turbo	🟢 Available	Latest GPT-4, strong reasoning	Complex tasks, code generation
GPT-4	🟢 Available	Standard GPT-4	Professional analysis, long text
GPT-3.5 Turbo	🟢 Available	Fast and economical	Daily conversation, quick tasks
GPT-3.5 Turbo 16K	🟢 Available	Long context support	Document processing

Model	Status	Features	Use Cases
Claude Sonnet 4	🟢 Available	Latest Claude, 200K context	Long document, content creation
Claude 3 Opus	🟢 Available	Highest performance	Complex reasoning, professional writing
Claude 3 Sonnet	🟢 Available	Balanced performance	General tasks, code review
Claude 3 Haiku	🟢 Available	Fast response	Quick queries, real-time conversation

Model	Status	Features	Use Cases
Gemini 2.5 Pro	🟢 Available	Multimodal, 1M context	Image understanding, long text
Gemini 1.5 Pro	🟢 Available	Long context support	Document analysis, code understanding
Gemini Flash	🟢 Available	Lightweight, fast	Real-time applications, high concurrency

Model	Status	Features	Use Cases
DALL-E 3	🟢 Available	High quality image generation	Creative design, marketing materials
DALL-E 2	🟢 Available	Fast generation	Quick prototyping, batch production
Flux Pro	🟢 Available	Style variety	Artistic creation, illustration
Sora Image	🟢 Available	OpenAI image model	General image generation

Model	Status	Features	Use Cases
Sora 2	🟢 Available	10s video generation	Short video creation, animations
VEO 3	🟢 Available	15s high quality video	Professional video production

Real-time Status

Check latest model status:

import requests

# Get model list
response = requests.get(
    "https://api.yelinai.com/v1/models",
    headers={"Authorization": "Bearer your_api_key"}
)

models = response.json()
for model in models['data']:
    print(f"{model['id']}: {model['status']}")

Model Selection Recommendations

By Task Type

Task Type	Recommended Model	Alternative	Reason
Daily Conversation	GPT-3.5 Turbo	Gemini Flash	Fast, economical
Code Generation	GPT-4 Turbo	Claude Sonnet 4	Strong code understanding
Long Document	Claude Sonnet 4	Gemini 2.5 Pro	200K+ context
Content Creation	Claude 3 Opus	GPT-4 Turbo	Strong creativity
Quick Translation	GPT-3.5 Turbo	Gemini Flash	Fast response
Image Understanding	Gemini 2.5 Pro	GPT-4 Vision	Multimodal capability
Image Generation	DALL-E 3	Flux Pro	High quality
Video Creation	Sora 2	VEO 3	Cost-effective

By Budget

Budget Level	Recommended Model	Daily Estimated Cost
Economical	GPT-3.5 Turbo, Gemini Flash	$1-5
Balanced	GPT-4 Turbo, Claude Sonnet 4	$10-30
Premium	Claude Opus, Gemini 2.5 Pro	$50-100
Custom	API-specific on-demand	Contact sales

By Response Speed

Speed Requirement	Recommended Model	Average Response Time
Real-time	Gemini Flash, GPT-3.5 Turbo	0.5-2s
Fast	GPT-4 Turbo, Claude Sonnet	2-5s
Standard	Claude Opus, Gemini 2.5 Pro	5-10s

Model Unavailability Handling

Temporary Unavailability

If model is temporarily unavailable:

import time

def call_with_fallback(primary_model, fallback_model, prompt):
    """Call with fallback model"""
    try:
        # Try primary model
        response = client.chat.completions.create(
            model=primary_model,
            messages=[{"role": "user", "content": prompt}]
        )
        return response
    except Exception as e:
        if "model_unavailable" in str(e):
            # Switch to fallback model
            print(f"{primary_model} unavailable, switching to {fallback_model}")
            response = client.chat.completions.create(
                model=fallback_model,
                messages=[{"role": "user", "content": prompt}]
            )
            return response
        else:
            raise e

# Usage example
result = call_with_fallback(
    primary_model="gpt-4-turbo",
    fallback_model="gpt-3.5-turbo",
    prompt="Hello, world!"
)

Auto-retry Mechanism

Implement smart retry mechanism:

from tenacity import retry, stop_after_attempt, wait_exponential, retry_if_exception_type

class ModelUnavailableError(Exception):
    pass

@retry(
    retry=retry_if_exception_type(ModelUnavailableError),
    stop=stop_after_attempt(3),
    wait=wait_exponential(multiplier=1, min=4, max=10)
)
def call_api_with_retry(model, prompt):
    """API call with retry"""
    try:
        response = client.chat.completions.create(
            model=model,
            messages=[{"role": "user", "content": prompt}]
        )
        return response
    except Exception as e:
        if "model_unavailable" in str(e):
            raise ModelUnavailableError(f"{model} unavailable")
        raise e

Model Fallback Chain

Implement multi-level fallback chain:

MODEL_FALLBACK_CHAIN = {
    "gpt-4-turbo": ["gpt-4", "claude-sonnet-4", "gpt-3.5-turbo"],
    "claude-opus": ["claude-sonnet-4", "gpt-4-turbo", "claude-haiku"],
    "gemini-2.5-pro": ["gemini-1.5-pro", "gpt-4-turbo", "claude-sonnet-4"]
}

def call_with_fallback_chain(model, prompt):
    """Try call with fallback chain"""
    models_to_try = [model] + MODEL_FALLBACK_CHAIN.get(model, [])
    
    for current_model in models_to_try:
        try:
            response = client.chat.completions.create(
                model=current_model,
                messages=[{"role": "user", "content": prompt}]
            )
            if current_model != model:
                print(f"Using fallback model: {current_model}")
            return response
        except Exception as e:
            if "model_unavailable" in str(e):
                continue
            raise e
    
    raise Exception("All models unavailable")

Common Issues

Error: “Model not found” Possible Causes:

Model name incorrect
Model not available in your region
Model has been deprecated

Solutions:

# Check available models
response = requests.get(
    "https://api.yelinai.com/v1/models",
    headers={"Authorization": "Bearer your_api_key"}
)
available_models = [m['id'] for m in response.json()['data']]
print("Available models:", available_models)

# Verify model name
model = "gpt-4-turbo"  # Ensure name is correct
if model not in available_models:
    print(f"{model} unavailable, please choose another model")

Error: “Model temporarily unavailable” Possible Causes:

Model under maintenance
High load on model
Network issues

Solutions:

Retry: Retry after a few minutes
Switch Model: Use alternative model
Check Status: Check [Status Page](https://status.YeLIn AI)

import time

def call_with_retry(model, prompt, max_retries=3):
    for i in range(max_retries):
        try:
            return client.chat.completions.create(
                model=model,
                messages=[{"role": "user", "content": prompt}]
            )
        except Exception as e:
            if i < max_retries - 1:
                wait_time = 2 ** i  # Exponential backoff
                print(f"Retry {i+1}/{max_retries}, waiting {wait_time}s...")
                time.sleep(wait_time)
            else:
                raise e

Why are some models not available? Possible Reasons:

Region Restrictions
- Some models restricted by region
- Comply with local regulations
- Can apply for special access
Subscription Plan
- Some models require higher plan
- Upgrade plan to access
- Or purchase dedicated model access
Capacity Limitations
- New models may have capacity limits
- Gradually opening to more users
- Can join waitlist
Maintenance Updates
- Models periodically maintained and updated
- Typically choose off-peak hours
- Advance notice on [Status Page](https://status.YeLIn AI)

How to get early access to new models? Application Methods:

Join Beta Program
- Fill out Beta Application Form
- Provide usage scenarios and needs
- Priority for active users
Enterprise Users
- Contact sales team: [sales@YeLIn AI](mailto:sales@YeLIn AI)
- Can get early access privileges
- Dedicated support and services
Developer Community
- Follow [Official Blog](https://blog.YeLIn AI)
- Join Developer Discord
- Participate in community activities

Will models be deprecated? Deprecation Policy:

Advance Notice: At least 3 months notice before deprecation
Migration Guide: Provide detailed migration guide
Compatibility Period: Maintain compatibility period
Support: Offer free migration support

How to Get Notifications:

Subscribe to API Updates
Enable email notifications in console
Follow Official Twitter

Model Performance Monitoring

Real-time Monitoring Dashboard

Access [Model Status Dashboard](https://status.YeLIn AI) to view:

Availability: Model online rate
Response Time: Average response time
Success Rate: Request success rate
Queue Status: Current queue length

Self-built Monitoring

Implement your own monitoring system:

import time
import requests

def monitor_model_status(models, interval=60):
    """Monitor model status"""
    while True:
        for model in models:
            try:
                start_time = time.time()
                response = client.chat.completions.create(
                    model=model,
                    messages=[{"role": "user", "content": "test"}],
                    max_tokens=5
                )
                response_time = time.time() - start_time
                
                print(f"{model}: ✅ Available, Response time: {response_time:.2f}s")
            except Exception as e:
                print(f"{model}: ❌ Unavailable, Error: {str(e)}")
        
        time.sleep(interval)

# Monitor key models
models_to_monitor = ["gpt-4-turbo", "claude-sonnet-4", "gemini-2.5-pro"]
monitor_model_status(models_to_monitor)

Best Practices

1. Smart Model Selection

Dynamically select models based on task:

def select_model(task_type, complexity, budget):
    """Smart model selection"""
    if budget == "low":
        return "gpt-3.5-turbo"
    
    if complexity == "high":
        if task_type == "code":
            return "gpt-4-turbo"
        elif task_type == "long_text":
            return "claude-sonnet-4"
        else:
            return "gpt-4-turbo"
    else:
        return "gpt-3.5-turbo"

2. Load Balancing

Distribute requests across multiple models:

import random

AVAILABLE_MODELS = [
    "gpt-4-turbo",
    "claude-sonnet-4",
    "gemini-2.5-pro"
]

def load_balanced_call(prompt):
    """Load balanced call"""
    model = random.choice(AVAILABLE_MODELS)
    try:
        return client.chat.completions.create(
            model=model,
            messages=[{"role": "user", "content": prompt}]
        )
    except Exception as e:
        # Try other models if one fails
        for backup_model in AVAILABLE_MODELS:
            if backup_model != model:
                try:
                    return client.chat.completions.create(
                        model=backup_model,
                        messages=[{"role": "user", "content": prompt}]
                    )
                except:
                    continue
        raise e

3. Cache Strategy

Cache model responses to reduce calls:

from functools import lru_cache
import hashlib

@lru_cache(maxsize=1000)
def cached_completion(model, prompt_hash):
    """Cached completion"""
    # Actual API call
    response = client.chat.completions.create(
        model=model,
        messages=[{"role": "user", "content": prompt_hash}]
    )
    return response

def get_completion(model, prompt):
    """Get completion with cache"""
    prompt_hash = hashlib.md5(prompt.encode()).hexdigest()
    return cached_completion(model, prompt_hash)

Pricing Description - View model pricing
API Reference - Model API documentation
Model Comparison - Detailed model comparison
[Status Page](https://status.YeLIn AI) - Real-time service status