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Overview

CTGT API provides access to 10 state-of-the-art AI models across different tiers. All pricing is pay-as-you-go based on token usage.
Pricing is per 1 million tokens (1M tokens). You only pay for what you use.

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Free Tier Models

Available immediately upon signup - no credit card required:

Gemini 2.5 Flash

Fast and efficient for general tasksModel: gemini-2.5-flashPricing (per 1M tokens):
  • Input: $0.50
  • Output: $2.70

Gemini 2.5 Flash Lite

Lightweight for simple queriesModel: gemini-2.5-flash-litePricing (per 1M tokens):
  • Input: $0.30
  • Output: $0.60

Claude Haiku 4.5

Fast Claude modelModel: claude-haiku-4-5-20251001Pricing (per 1M tokens):
  • Input: $1.20
  • Output: $5.20
Unlock all models with a paid subscription:

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Premium Claude Models

Claude Sonnet 4.5

Balanced intelligence and speedModel: claude-sonnet-4-5-20250929Pricing (per 1M tokens):
  • Input: $5.00
  • Output: $17.00
Best for: Complex reasoning, analysis, creative writing

Claude Opus 4.5

Most capable Claude modelModel: claude-opus-4-5-20251101Pricing (per 1M tokens):
  • Input: $10.00
  • Output: $30.00
Best for: Research, expert-level tasks, multi-step reasoning

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GPT-5 Model Family

GPT-5

Advanced reasoning capabilitiesModel: gpt-5Pricing (per 1M tokens):
  • Input: $3.25
  • Output: $12.00
Best for: General-purpose tasks, coding, analysis

GPT-5.2

Enhanced GPT-5 with improvementsModel: gpt-5.2Pricing (per 1M tokens):
  • Input: $6.75
  • Output: $19.00
Best for: Advanced tasks, better accuracy

GPT-5 Mini

Compact GPT-5 variantModel: gpt-5-miniPricing (per 1M tokens):
  • Input: $3.25
  • Output: $12.00
Best for: Cost-effective GPT-5 access

GPT-5 Nano

Ultra-efficient modelModel: gpt-5-nanoPricing (per 1M tokens):
  • Input: $0.25
  • Output: $0.60
Best for: High-volume, simple tasks

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Advanced Gemini Models

Gemini 3 Pro

Next-generation GeminiModel: gemini-3-proPricing (per 1M tokens):
  • Input: $4.00
  • Output: $14.00
Best for: Multimodal tasks, complex reasoning

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Complete Pricing Table

ModelTierInput (per 1M tokens)Output (per 1M tokens)Best Use Case
gemini-2.5-flash-liteFree$0.30$0.60Simple queries, high volume
gemini-2.5-flashFree$0.50$2.70General tasks, fast responses
gpt-5-nanoPaid$0.25$0.60Ultra-efficient processing
claude-haiku-4-5-20251001Free$1.20$5.20Fast Claude responses
gpt-5Paid$3.25$12.00Advanced reasoning
gpt-5-miniPaid$3.25$12.00Cost-effective GPT-5
gemini-3-proPaid$4.00$14.00Next-gen capabilities
claude-sonnet-4-5-20250929Paid$5.00$17.00Balanced intelligence
gpt-5.2Paid$6.75$19.00Enhanced performance
claude-opus-4-5-20251101Paid$10.00$30.00Expert-level tasks

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Switching Between Models

You can easily switch between models by changing the model parameter: 
curl -X POST https://api.ctgt.ai/v1/chat/completions \
  -H "Authorization: Bearer sk-ctgt-YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-2.5-flash",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

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Model Availability Check

You can check which models are available for your tier: 
curl https://api.ctgt.ai/v1/subscription/info \
  -H "Authorization: Bearer sk-ctgt-YOUR_API_KEY"
Response includes: 
{
  "subscription_tier": "free",
  "available_models": [
    {
      "model": "gemini-2.5-flash",
      "display_name": "Gemini 2.5 Flash",
      "tier": "free",
      "pricing": {
        "input": 0.50,
        "output": 2.70
      }
    }
  ]
}

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Upgrade to Access All Models

Unlock All 10 Models

Upgrade to paid tier for:
  • Access to all 10 models
  • 100x higher rate limits
  • Priority support
  • Production-ready infrastructure
Starting at $10/month + pay-as-you-go usage

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Next Steps

Upgrade to Paid

Unlock all models and higher limits

API Features

Learn about streaming, temperature, and more

Code Examples

See complete implementation examples

Monitor Usage

Track your token usage and costs