How much does GPT-5 API cost?

GPT-5 API costs $1.25 per million input tokens and $10.00 per million output tokens. GPT-5 mini is cheaper at $0.25 input/$2.00 output, while GPT-5 nano costs just $0.05 input/$0.40 output per million tokens.

What are Claude 4 API pricing rates?

Claude Sonnet 4 costs $3.00 per million input tokens and $15.00 per million output tokens. Claude Opus 4.1 is premium priced at $15.00 input/$75.00 output per million tokens.

How much does Gemini 2.5 Pro cost?

Gemini 2.5 Pro costs $3.00 per million input tokens and $10.00 per million output tokens. Gemini 2.5 Flash is cheaper at $0.15 input/$0.60 output, and Flash-Lite costs just $0.10 input/$0.40 output.

What is the cheapest AI API in 2025?

DeepSeek V3 is the cheapest at $0.27 input/$1.10 output per million tokens, with cache pricing as low as $0.07 per million input tokens. GPT-5 nano and Groq Llama models are also very cost-effective options.

How do I calculate monthly AI API costs?

Use our free calculator: input your daily requests, average input/output tokens, select your AI models, and we will calculate daily, monthly, and yearly costs with growth projections. Factor in approximately 750 words = 1,000 tokens.

Which AI models support the largest context windows?

Gemini 2.5 Pro offers the largest context window at 2M tokens, followed by GPT-5 at 256K tokens, Llama 4 Behemoth at 256K tokens, and most other flagship models at 128K-200K tokens.

Free AI API Cost Calculator 2025: GPT-5, Claude 4, Gemini 2.5 Pricing

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💡 Understanding AI API Pricing

Token Basics: AI models charge based on tokens (pieces of text). As a rough estimate:

1 token ≈ 4 characters or 0.75 words
1,000 tokens ≈ 750 words or 3,000 characters
Most models charge separately for input (prompts) and output (responses)

Cost Optimization Tips:

Use smaller models for simple tasks (GPT-3.5 Turbo, Claude Instant)
Implement caching to avoid repeated API calls
Batch similar requests when possible
Consider fine-tuning for specialized tasks
Monitor usage with provider dashboards

Hidden Costs to Consider:

Rate limiting may require multiple API keys
Fine-tuning costs (if needed)
Embedding generation for RAG systems
Image generation (DALL-E, Midjourney)
Infrastructure for hosting and scaling

🤖 Free AI API Cost Calculator 2025

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💡 Understanding AI API Pricing