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class="note-properties-table"><tbody><tr class="note-properties-row metadata-property"><td class="note-properties-key metadata-property-key">tags</td><td class="note-properties-value metadata-property-value"><span class="note-properties-tags"><a href="../tags/routing" class="internal internal-link tag-link">routing</a><span class="note-properties-separator">, </span><a href="../tags/model" class="internal internal-link tag-link">model</a><span class="note-properties-separator">, </span><a href="../tags/inference" class="internal internal-link tag-link">inference</a></span></td></tr></tbody></table></details><p show-comma="true" class="content-meta"><time datetime="2026-07-21T16:00:00.000Z">Jul 22, 2026</time><span>1 min read</span></p></div></div><article class="popover-hint"><div class="markdown-preview-view markdown-rendered"><h1 id="model-routing">Model Routing<a role="anchor" aria-hidden="true" tabindex="-1" data-no-popover="true" href="#model-routing" class="internal internal-link"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></a></h1>
<h2 id="purpose">Purpose<a role="anchor" aria-hidden="true" tabindex="-1" data-no-popover="true" href="#purpose" class="internal internal-link"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></a></h2>
<p>How Hermes selects providers, applies combos, and enforces context limits.</p>
<h2 id="current-flow">Current Flow<a role="anchor" aria-hidden="true" tabindex="-1" data-no-popover="true" href="#current-flow" class="internal internal-link"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></a></h2>
<ul>
<li>Main path: <code>custom:litellm</code><code>http://litellm:4000/v1</code></li>
<li>Default model: <code>freellmapi-auto</code></li>
<li>OmniRoute used for auxiliary roles: vision, skills_hub, approval, mcp, title_generation, web_extract, compression</li>
</ul>
<h2 id="context-enforcement">Context Enforcement<a role="anchor" aria-hidden="true" tabindex="-1" data-no-popover="true" href="#context-enforcement" class="internal internal-link"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></a></h2>
<ul>
<li>Three layers: model native → combo <code>data.config.context_length</code> → Hermes client cap</li>
<li>Effective context is the minimum of the three</li>
</ul>
<h2 id="combo-behavior">Combo Behavior<a role="anchor" aria-hidden="true" tabindex="-1" data-no-popover="true" href="#combo-behavior" class="internal internal-link"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></a></h2>
<ul>
<li><code>priority</code> retries same provider up to <code>maxRetries</code>, then errors; it does NOT fall through</li>
<li><code>fill-first</code> walks the list on failure</li>
<li><code>auto</code>/<code>lkgp</code> recalculates per request using health scoring</li>
<li>Same-provider entries in a combo share rate-limit buckets</li>
<li>Session affinity caches provider in <code>session_model_history</code></li>
</ul>
<h2 id="aliases-and-mappings">Aliases and Mappings<a role="anchor" aria-hidden="true" tabindex="-1" data-no-popover="true" href="#aliases-and-mappings" class="internal internal-link"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></a></h2>
<ul>
<li>Model aliases resolved via <code>key_value</code> table (<code>modelAliases</code> namespace)</li>
<li>Wildcard mappings via <code>model_combo_mappings</code></li>
<li>OpenCode/Zen entries may resolve back to <code>opencode-zen</code> provider internally</li>
</ul>
<h2 id="history">History<a role="anchor" aria-hidden="true" tabindex="-1" data-no-popover="true" href="#history" class="internal internal-link"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></a></h2>
<ul>
<li>User-provided: OpenRouter was used previously; provider lists now centered on LiteLLM + OmniRoute</li>
<li>User-provided: <code>persist_switch_by_default=false</code>; <code>/model</code> is per-session unless <code>--global</code> used</li>
<li>Inferred: Configuration undergoes periodic corrections related to vision, model fallback, and browser backend tuning</li>
</ul>
<h2 id="related">Related<a role="anchor" aria-hidden="true" tabindex="-1" data-no-popover="true" href="#related" class="internal internal-link"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></a></h2>
<ul>
<li><a href="../systems/model-providers" class="internal internal-link" data-slug="systems/model-providers">model-providers</a></li>
<li><a href="../systems/omniroute" class="internal internal-link" data-slug="systems/omniroute">omniroute</a></li>
<li><a href="../systems/openrouter" class="internal internal-link" data-slug="systems/openrouter">openrouter</a></li>
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