/slash-tokens

Token Optimization for Context Engineers. For anyone building with LLMs. 4.8 KB WASM. Sub-millisecond. Zero dependencies.

Know the cost before the call leaves your machine.

🆕 v1.4 — The Single-Source-of-Truth Edition. New preflightRoute() matches the Slash proxy exactly — same-provider only, zero routing drift. PROVIDER_MODELS is now the single source of truth across the SDK.

v1.3 — The Opus 4.7 Edition. Same-day support for Claude Opus 4.7 with measured token calibration (1.16–1.51x). Plus Gemini proxy fix and benchmark harness for any upstream.

npm install slash-tokens

import { preflight, preflightRoute } from 'slash-tokens'

// Analysis — all cheaper alternatives across all providers
const check = preflight(prompt, 'claude-opus-4.7')
// tokens: 47,000 | cost: $0.71 | 11 cheaper options | save 99%

// Routing decision — matches Slash proxy behavior (same-provider only)
const route = preflightRoute(prompt, 'claude-opus-4.7')
// → { model: 'claude-haiku', cost: 0.14, salvaged: 0.57, ... } or null

Or one line — every API call optimized pre-call:

import 'slash-tokens/auto'

Every call routed to the cheapest model that can execute it efficiently. Session summary on exit:

[slash] Session: 47 calls | 23 routed | $0.89 salvaged — The more you build, the more you save

Next.js Starter

One-click deploy with Vercel AI SDK + slash-tokens built in:

→ slash-nextjs on GitHub

Dashboard

Track savings across all your apps. Free key at mcpaas.live/slash/setup

Full docs, examples, and model pricing at GitHub

License

Code: MIT. Fork it, ship it, change it, sell it.

Brand: reserved. The slash-tokens name, ⚡ mark, and red/gold colors stay with the project. If you're building on top of the SDK, ship under your own name and colors — don't represent your app as Slash.

🏎️ Don't go to the Corner Shop in a Ferrari. · slashtokens.com