gamma-cost-tuning

Gamma Cost Tuning

Overview

Optimize Gamma API usage to minimize credit consumption. Gamma uses a credit-based billing system where costs are driven by image generation model tier and content complexity. API access requires Pro or higher subscription.

Prerequisites

• Active Gamma Pro/Ultra/Teams/Business subscription
• Understanding of credit system
• Completed gamma-install-auth setup

Gamma Credit System

Image Model Tiers

Tier	Credits per Image	Quality Level
Standard	2-15	Good for internal/draft presentations
Advanced	20-33	Higher quality, more detail
Premium	34-75	Best quality images
Ultra	30-125	Highest fidelity, photorealistic

Card text generation also costs credits based on the AI model used.

Plan Comparison

Feature	Pro	Ultra	Teams	Business
Monthly credits	Included	More credits	Team pool	Custom
API access	Yes	Yes	Yes	Yes
Max cards	Standard	Up to 75	Standard	Custom
Ad-hoc credit purchase	Yes	Yes	Yes	Yes
Auto-recharge	Yes	Yes	Yes	Yes

Instructions

Step 1: Track Credit Usage

// src/gamma/cost-tracker.ts
interface UsageEntry {
  generationId: string;
  creditsUsed: number;
  outputFormat: string;
  timestamp: Date;
}

class CreditTracker {
  private usage: UsageEntry[] = [];

  record(entry: UsageEntry) {
    this.usage.push(entry);
  }

  getDaily(): { total: number; count: number; avg: number } {
    const today = new Date().toDateString();
    const todayUsage = this.usage.filter(
      (u) => u.timestamp.toDateString() === today
    );
    const total = todayUsage.reduce((sum, u) => sum + u.creditsUsed, 0);
    return {
      total,
      count: todayUsage.length,
      avg: todayUsage.length > 0 ? Math.round(total / todayUsage.length) : 0,
    };
  }

  getMonthly(): { total: number; count: number } {
    const thisMonth = new Date().getMonth();
    const monthUsage = this.usage.filter(
      (u) => u.timestamp.getMonth() === thisMonth
    );
    return {
      total: monthUsage.reduce((sum, u) => sum + u.creditsUsed, 0),
      count: monthUsage.length,
    };
  }
}

// Track after each generation
const tracker = new CreditTracker();

async function generateTracked(gamma: GammaClient, request: GenerateRequest) {
  const { generationId } = await gamma.generate(request);
  const result = await pollUntilDone(gamma, generationId);

  tracker.record({
    generationId,
    creditsUsed: result.creditsUsed ?? 0,
    outputFormat: request.outputFormat ?? "presentation",
    timestamp: new Date(),
  });

  return result;
}

Step 2: Optimize Image Costs

The biggest cost driver is image generation tier. Reduce costs by:

// EXPENSIVE: default image settings (may use Advanced/Premium tier)
await gamma.generate({
  content: "Company quarterly review",
  outputFormat: "presentation",
  // No imageOptions = AI chooses model tier
});

// CHEAPER: explicitly use standard tier when quality isn't critical
await gamma.generate({
  content: "Company quarterly review",
  outputFormat: "presentation",
  imageOptions: {
    style: "simple flat illustration", // Simpler styles use fewer credits
  },
});

// CHEAPEST: text-focused, minimal images
await gamma.generate({
  content: "Company quarterly review",
  outputFormat: "document", // Documents typically use fewer images
  textAmount: "detailed",   // Focus on text, not visuals
});

Step 3: Use Templates to Reduce Regeneration

// WASTEFUL: regenerating entire presentations for minor content changes
for (const client of clients) {
  await gamma.generate({
    content: `Proposal for ${client.name}: ${fullProposalText}`,
    outputFormat: "presentation",
  });
  // Each generation costs full credits
}

// EFFICIENT: use templates for repeated structures
// Create a one-page template gamma in the app
// Then generate variations with targeted prompts
for (const client of clients) {
  await gamma.generateFromTemplate({
    gammaId: "template_proposal_id",
    prompt: `Customize for ${client.name}. Focus on ${client.industry}.`,
    exportAs: "pdf",
  });
  // Template generations can be more cost-effective
}

Step 4: Budget Alerts

// src/gamma/budget.ts
const MONTHLY_BUDGET = 5000; // credits
const ALERT_THRESHOLDS = [0.5, 0.75, 0.9, 1.0]; // 50%, 75%, 90%, 100%

async function checkBudget(tracker: CreditTracker) {
  const { total } = tracker.getMonthly();
  const percentUsed = total / MONTHLY_BUDGET;

  for (const threshold of ALERT_THRESHOLDS) {
    if (percentUsed >= threshold) {
      await sendAlert(
        `Gamma budget ${(threshold * 100)}% used: ${total}/${MONTHLY_BUDGET} credits`
      );
    }
  }

  // Hard stop at 100%
  if (percentUsed >= 1.0) {
    throw new Error(`Monthly Gamma budget exceeded: ${total}/${MONTHLY_BUDGET} credits`);
  }
}

Step 5: Caching to Avoid Regeneration

// Cache generation results to avoid paying twice for same content
import NodeCache from "node-cache";

const generationCache = new NodeCache({ stdTTL: 86400 }); // 24 hour TTL

async function generateCached(
  gamma: GammaClient,
  request: GenerateRequest
): Promise<GenerateResult> {
  // Create cache key from request parameters
  const key = JSON.stringify({
    content: request.content,
    outputFormat: request.outputFormat,
    themeId: request.themeId,
    textMode: request.textMode,
  });

  const cached = generationCache.get<GenerateResult>(key);
  if (cached) {
    console.log("Cache hit — skipping generation");
    return cached;
  }

  const result = await generateAndWait(gamma, request);
  generationCache.set(key, result);
  return result;
}

Cost Reduction Summary

Strategy	Credit Savings	Implementation
Standard image tier	50-80% on images	Set imageOptions.style to simpler styles
Templates over ad-hoc	20-40%	Use generateFromTemplate for repeated content
Caching results	100% on duplicates	Cache by content hash
Text-focused output	30-50%	Use document format, textAmount: "detailed"
Budget caps	Prevents overrun	Track credits, alert at thresholds
Auto-recharge	Avoids disruption	Enable at gamma.app/settings/billing

Error Handling

Issue	Cause	Solution
Credits exhausted	Over budget	Purchase ad-hoc credits or enable auto-recharge
Unexpected high cost	Premium image tier	Specify imageOptions.style explicitly
Budget alert missed	Tracker not running	Verify tracking on all generation paths

Resources

• Gamma Pricing
• API Access and Pricing
• Credit System Explained

Next Steps

Proceed to gamma-reference-architecture for architecture patterns.