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<h1 id="adr-016-cost-efficiency-ranking-algorithm"><a class="header" href="#adr-016-cost-efficiency-ranking-algorithm">ADR-016: Cost Efficiency Ranking Algorithm</a></h1>
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<p><strong>Status</strong>: Accepted | Implemented
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<strong>Date</strong>: 2024-11-01
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<strong>Deciders</strong>: Cost Architecture Team
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<strong>Technical Story</strong>: Ranking LLM providers by quality-to-cost ratio to prevent cost overfitting</p>
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<hr />
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<h2 id="decision"><a class="header" href="#decision">Decision</a></h2>
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<p>Implementar <strong>Cost Efficiency Ranking</strong> con fórmula <code>efficiency = (quality_score * 100) / (cost_cents + 1)</code>.</p>
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<hr />
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<h2 id="rationale"><a class="header" href="#rationale">Rationale</a></h2>
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<ol>
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<li><strong>Prevents Cost Overfitting</strong>: No preferir siempre provider más barato (quality importa)</li>
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<li><strong>Balances Quality and Cost</strong>: Fórmula explícita que combina ambas dimensiones</li>
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<li><strong>Handles Zero-Cost</strong>: <code>+ 1</code> evita division-by-zero para Ollama ($0)</li>
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<li><strong>Normalized Scale</strong>: Scores comparables entre providers</li>
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</ol>
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<hr />
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<h2 id="alternatives-considered"><a class="header" href="#alternatives-considered">Alternatives Considered</a></h2>
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<h3 id="-quality-only-ignore-cost"><a class="header" href="#-quality-only-ignore-cost">❌ Quality Only (Ignore Cost)</a></h3>
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<ul>
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<li><strong>Pros</strong>: Highest quality</li>
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<li><strong>Cons</strong>: Unbounded costs</li>
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</ul>
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<h3 id="-cost-only-ignore-quality"><a class="header" href="#-cost-only-ignore-quality">❌ Cost Only (Ignore Quality)</a></h3>
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<ul>
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<li><strong>Pros</strong>: Lowest cost</li>
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<li><strong>Cons</strong>: Poor quality results</li>
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</ul>
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<h3 id="-qualitycost-ratio-chosen"><a class="header" href="#-qualitycost-ratio-chosen">✅ Quality/Cost Ratio (CHOSEN)</a></h3>
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<ul>
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<li>Balances both dimensions mathematically</li>
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</ul>
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<hr />
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<h2 id="trade-offs"><a class="header" href="#trade-offs">Trade-offs</a></h2>
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<p><strong>Pros</strong>:</p>
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<ul>
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<li>✅ Single metric for comparison</li>
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<li>✅ Prevents cost overfitting</li>
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<li>✅ Prevents quality overfitting</li>
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<li>✅ Handles zero-cost providers</li>
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<li>✅ Easy to understand and explain</li>
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</ul>
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<p><strong>Cons</strong>:</p>
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<ul>
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<li>⚠️ Formula is simplified (assumes linear quality/cost)</li>
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<li>⚠️ Quality scores must be comparable across providers</li>
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<li>⚠️ May not capture all cost factors (latency, tokens)</li>
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</ul>
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<hr />
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<h2 id="implementation"><a class="header" href="#implementation">Implementation</a></h2>
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<p><strong>Quality Scores (Baseline)</strong>:</p>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>// crates/vapora-llm-router/src/cost_ranker.rs
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pub struct ProviderQuality {
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provider: String,
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model: String,
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quality_score: f32, // 0.0 - 1.0
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}
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pub const QUALITY_SCORES: &[ProviderQuality] = &[
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ProviderQuality {
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provider: "claude",
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model: "claude-opus",
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quality_score: 0.95, // Best reasoning
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},
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ProviderQuality {
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provider: "openai",
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model: "gpt-4",
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quality_score: 0.92, // Excellent code generation
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},
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ProviderQuality {
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provider: "gemini",
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model: "gemini-2.0-flash",
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quality_score: 0.88, // Good balance
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},
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ProviderQuality {
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provider: "ollama",
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model: "llama2",
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quality_score: 0.75, // Lower quality (local)
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},
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];
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<span class="boring">}</span></code></pre></pre>
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<p><strong>Cost Efficiency Calculation</strong>:</p>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>pub struct CostEfficiency {
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provider: String,
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quality_score: f32,
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cost_cents: u32,
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efficiency_score: f32,
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}
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impl CostEfficiency {
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pub fn calculate(
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provider: &str,
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quality: f32,
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cost_cents: u32,
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) -> f32 {
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(quality * 100.0) / ((cost_cents as f32) + 1.0)
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}
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pub fn from_provider(
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provider: &str,
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quality: f32,
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cost_cents: u32,
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) -> Self {
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let efficiency = Self::calculate(provider, quality, cost_cents);
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Self {
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provider: provider.to_string(),
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quality_score: quality,
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cost_cents,
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efficiency_score: efficiency,
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}
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}
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}
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// Examples:
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// Claude Opus: quality=0.95, cost=50¢ → efficiency = (0.95*100)/(50+1) = 1.86
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// GPT-4: quality=0.92, cost=30¢ → efficiency = (0.92*100)/(30+1) = 2.97
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// Gemini: quality=0.88, cost=5¢ → efficiency = (0.88*100)/(5+1) = 14.67
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// Ollama: quality=0.75, cost=0¢ → efficiency = (0.75*100)/(0+1) = 75.0
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<span class="boring">}</span></code></pre></pre>
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<p><strong>Ranking by Efficiency</strong>:</p>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>pub async fn rank_providers_by_efficiency(
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providers: &[LLMClient],
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task_type: &str,
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) -> Result<Vec<(String, f32)>> {
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let mut efficiencies = Vec::new();
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for provider in providers {
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let quality = get_quality_for_task(&provider.id, task_type)?;
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let cost_per_token = provider.cost_per_token();
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let estimated_tokens = estimate_tokens_for_task(task_type);
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let total_cost_cents = (cost_per_token * estimated_tokens as f64) as u32;
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let efficiency = CostEfficiency::calculate(
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&provider.id,
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quality,
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total_cost_cents,
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);
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efficiencies.push((provider.id.clone(), efficiency));
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}
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// Sort by efficiency descending
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efficiencies.sort_by(|a, b| {
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b.1.partial_cmp(&a.1).unwrap_or(std::cmp::Ordering::Equal)
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});
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Ok(efficiencies)
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}
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<span class="boring">}</span></code></pre></pre>
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<p><strong>Provider Selection with Efficiency</strong>:</p>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>pub async fn select_best_provider_by_efficiency(
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task: &Task,
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available_providers: &[LLMClient],
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) -> Result<&'_ LLMClient> {
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let ranked = rank_providers_by_efficiency(available_providers, &task.task_type).await?;
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|
|
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// Return highest efficiency
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ranked
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.first()
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.and_then(|(provider_id, _)| {
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available_providers.iter().find(|p| p.id == *provider_id)
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})
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.ok_or(Error::NoProvidersAvailable)
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}
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<span class="boring">}</span></code></pre></pre>
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<p><strong>Efficiency Metrics</strong>:</p>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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|
</span><span class="boring">fn main() {
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|
</span>pub async fn report_efficiency(
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db: &Surreal<Ws>,
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) -> Result<String> {
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|
// Query: execution history with cost and quality
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let query = r#"
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SELECT
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provider,
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avg(quality_score) as avg_quality,
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avg(cost_cents) as avg_cost,
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(avg(quality_score) * 100) / (avg(cost_cents) + 1) as avg_efficiency
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FROM executions
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WHERE timestamp > now() - 1d -- Last 24 hours
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GROUP BY provider
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ORDER BY avg_efficiency DESC
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"#;
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let results = db.query(query).await?;
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Ok(format_efficiency_report(results))
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}
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<span class="boring">}</span></code></pre></pre>
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<p><strong>Key Files</strong>:</p>
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<ul>
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<li><code>/crates/vapora-llm-router/src/cost_ranker.rs</code> (efficiency calculations)</li>
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<li><code>/crates/vapora-llm-router/src/router.rs</code> (provider selection)</li>
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<li><code>/crates/vapora-backend/src/services/</code> (cost analysis)</li>
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|
</ul>
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<hr />
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<h2 id="verification"><a class="header" href="#verification">Verification</a></h2>
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<pre><code class="language-bash"># Test efficiency calculation with various costs
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cargo test -p vapora-llm-router test_cost_efficiency_calculation
|
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# Test zero-cost handling (Ollama)
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cargo test -p vapora-llm-router test_zero_cost_efficiency
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# Test provider ranking by efficiency
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cargo test -p vapora-llm-router test_provider_ranking_efficiency
|
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# Test efficiency comparison across providers
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cargo test -p vapora-llm-router test_efficiency_comparison
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# Integration: select best provider by efficiency
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cargo test -p vapora-llm-router test_select_by_efficiency
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</code></pre>
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<p><strong>Expected Output</strong>:</p>
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<ul>
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<li>Claude Opus ranked well despite higher cost (quality offset)</li>
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<li>Ollama ranked very high (zero cost, decent quality)</li>
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<li>Gemini ranked between (good efficiency)</li>
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<li>GPT-4 ranked based on balanced cost/quality</li>
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<li>Rankings consistent across multiple runs</li>
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</ul>
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<hr />
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<h2 id="consequences"><a class="header" href="#consequences">Consequences</a></h2>
|
|
<h3 id="cost-optimization"><a class="header" href="#cost-optimization">Cost Optimization</a></h3>
|
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<ul>
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<li>Prevents pure cost minimization (quality matters)</li>
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<li>Prevents pure quality maximization (cost matters)</li>
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<li>Balanced strategy emerges</li>
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</ul>
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<h3 id="provider-selection"><a class="header" href="#provider-selection">Provider Selection</a></h3>
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<ul>
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<li>No single provider always selected (depends on task)</li>
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<li>Ollama used frequently (high efficiency)</li>
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<li>Premium providers used for high-quality tasks only</li>
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</ul>
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<h3 id="reporting"><a class="header" href="#reporting">Reporting</a></h3>
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<ul>
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<li>Efficiency metrics tracked over time</li>
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<li>Identify providers underperforming cost-wise</li>
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<li>Guide budget allocation</li>
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</ul>
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<h3 id="monitoring"><a class="header" href="#monitoring">Monitoring</a></h3>
|
|
<ul>
|
|
<li>Alert if efficiency drops for any provider</li>
|
|
<li>Track efficiency trends</li>
|
|
<li>Recommend provider switches if efficiency improves</li>
|
|
</ul>
|
|
<hr />
|
|
<h2 id="references"><a class="header" href="#references">References</a></h2>
|
|
<ul>
|
|
<li><code>/crates/vapora-llm-router/src/cost_ranker.rs</code> (implementation)</li>
|
|
<li><code>/crates/vapora-llm-router/src/router.rs</code> (usage)</li>
|
|
<li>ADR-007 (Multi-Provider LLM)</li>
|
|
<li>ADR-015 (Budget Enforcement)</li>
|
|
</ul>
|
|
<hr />
|
|
<p><strong>Related ADRs</strong>: ADR-007 (Multi-Provider), ADR-015 (Budget), ADR-012 (Routing Tiers)</p>
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