AI Agent Model Fallback Chain 2026

GPT-4o is down, but the Agent won't automatically switch to Claude. The model fallback chain lets the Agent automatically swap to a backup when the primary API is unavailable.

💡 What You Will Learn

GPT-4o is down, but the Agent won't automatically switch to Claude. The model fallback chain lets the Agent automatically swap to a backup when the primary API is unavailable.

models = [
    ('gpt-4o', openai_call),
    ('claude-3', anthropic_call),
    ('deepseek', deepseek_call),
    ('local', ollama_call),
]

def call_with_fallback(prompt):
    for name, fn in models:
        try:
            return fn(prompt)
        except Exception:
            continue
    return 'Service unavailable'

Summary