Latest articles
Explore practical routing guides, API performance notes, and product updates from the Fastrouter team.
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Amazon shut down a token leaderboard. Uber burned through its AI budget in a quarter. This is not an AI hype problem — it is what happens when usage scales without governance
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AI Spend Management: What Engineering Leaders Need to Get Right in 2026
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Stop deploying code just to update a prompt. FastRouter Prompt Library gives you versioning, instant rollback, and GEPA optimization.
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Sticky routing pins each conversation to one provider endpoint so your prompt cache stays warm. Here is how FastRouter handles it automatically.
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Prompt caching can cut repeated context costs by up to 90%. Here is how it works across major providers and why most teams are not using it yet
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We fine-tuned Gemma 3 4B on 3,000 synthetic browser trajectories and benchmarked it against GPT-5.1, Claude 4.5 Sonnet, and six other models.
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5 practical levers engineering teams are using to reduce LLM spend right now — model routing, prompt caching, Flex Processing, and Batch
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How I Cut My LLM Bill 79% in 15 Minutes Without Changing Application Code
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Enterprise AI spend is past the adoption phase. Here is what the first wave of LLM investment is teaching engineering leaders about cost accountability.
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Under the Hood: Building a Hybrid AI Agent with FastRouter BYOK | Fastrouter Blog
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Stop routing every agent task to a frontier model. The Architect-Editor pipeline cuts costs 55% by matching model capability to task complexity.
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Stop guessing at prompt quality. GEPA evolves your system prompts automatically — real production data, multi-metric scoring, full iteration audit.
