Fall back without changing your app contract You route across models by capability, health, latency, price, or application policy. A fallback preserves the typed contract and remains observable. rust academy academy/topics/routing-fallback website/content-src/academy/course.mjs academy Fall back without changing your app contract
ax
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Unit 11 · Ship AI systems you can operate

Fall back without changing your app contract

You route across models by capability, health, latency, price, or application policy. A fallback preserves the typed contract and remains observable.

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Unit example (nearest native match)

See the idea in context

let program = ax("text:string -> label:string")?;
let usage = program.usage();
Run itIn your own project
cargo add axllm

use axllm::{ai, ax};
use serde_json::json;

let llm = ai("openai", json!({"apiKey": std::env::var("OPENAI_API_KEY")?}))?;
let classify = ax("review:string -> sentiment:class \"positive, negative, neutral\"")?;

Set OPENAI_APIKEY in your environment before running provider-backed code.

In the ax repo

From a clone of the ax repo:

npm run example -- rust src/examples/rust/long-agents/smart_defaults_agent.rs
Active practice

Show that you can use it

Answer 2 in a row to learn this · attempt 1
Keep exploring

Source-backed follow-up