GPT Turbo - Plugin - Stats

A GPT Turbo plugin to augment conversations with usage statistics:

• Size: The size (in tokens) of the conversation. This includes the system (context) message. It's an indicator of the minimum amount of tokens that will be sent on the next Chat Completion call.
• Cumulative Size: The cumulative size (in tokens) of the conversation. It's the amount of tokens that have been send/received since the start of the conversation. This is the amount of tokens you've been charged for.
• Cost: The cost (in $USD) of the conversation. It's an indicator of the minimum amount of money that will be charged on the next Chat Completion call.
• Cumulative cost: The cumulative cost (in $USD) of the conversation. It's the amount of money that has been charged since the start of the conversation.

Disclaimer

The statistics are based on the tokens given by a third party library: gpt-tokenizer. While its tokenization is usually accurate, it's not guaranteed to be 100% accurate. Stats may differ from OpenAI's bill, but usually not by much.

Installation

gpt-turbo is required to use this plugin and is marked as a peer dependency. You can install it with:

npm i gpt-turbo

Then install this plugin with:

npm i gpt-turbo-plugin-stats

Note: since this plugin is developed alongside the library, both versions must be equal. Your installation will fail otherwise.

Usage

Here are some examples of how to inject the plugin (statsPlugin) in a Conversation and how to retrieve the output ConversationStats instance (stats).

import { Conversation } from "gpt-turbo";
import statsPlugin, { statsPluginName } from "gpt-turbo-plugin-stats";

// As a per-conversation plugin
const conversation = new Conversation({
    plugins: [statsPlugin]
});
const stats = conversation.plugins.getPluginOutput(statsPluginName); // ConversationStats

// As a global plugin
const globalPlugins = [statsPlugin];
declare module "gpt-turbo" {
    interface ConversationGlobalPluginsOverride {
        globalPlugins: typeof globalPlugins;
    }
}
Conversation.globalPlugins = globalPlugins;
const conversation = new Conversation();
const stats = conversation.plugins.getPluginOutput(statsPluginName); // ConversationStats

If you're getting the plugin dynamically (i.e. not from a string literal or the statsPluginName constant), you can use the isStatsPlugin type guard to properly type the plugin:

import { Conversation } from "gpt-turbo";
import statsPlugin, { isStatsPlugin } from "gpt-turbo-plugin-stats";

const conversation = new Conversation({
    plugins: [statsPlugin]
});

const plugin = conversation.plugins.getPlugin("gpt-turbo-plugin" + "-stats");
plugin.out; // any

if (isStatsPlugin(plugin)) {
    const stats = plugin.out; // ConversationStats
}

With the ConversationStats instance, you can retrieve the stats:

console.log(stats.size, stats.cumulativeSize, stats.cost, stats.cumulativeCost);

Finally, you can subscribe to events to get notified when the stats change:

const unsubscribe = stats.onStatsUpdate(() => {
    console.log(stats.size, stats.cumulativeSize, stats.cost, stats.cumulativeCost);
});
setTimeout(unsubscribe, 1000); // Unsubscribe after 1 second