GPT-4o API Pricing 2026: Cost Per Token, Calculator & Comparison

GPT-4o API Pricing at a Glance

As of 2026, GPT-4o is priced at $2.50 per million input tokens and $10.00 per million output tokens on OpenAI's standard pay-as-you-go API.

Token Type	Price per 1M Tokens	Price per 1K Tokens
Input (prompt)	$2.50	$0.0025
Cached Input	$1.25	$0.00125
Output (completion)	$10.00	$0.0100

      Quick estimate: A typical chatbot exchange (500 input + 300 output tokens) costs approximately $0.00425 — meaning you can run ~235 conversations per dollar.
    

Heads up — GPT-4o is now a legacy model. OpenAI's current line is GPT-5.5 / GPT-5.4. GPT-4o is still callable at the same $2.50/$10 rate, but if you're choosing a model today, compare it against the current generation in the 2026 AI API pricing guide or the cost calculator.

GPT-4o vs. Other Top Models (2026)

How does GPT-4o compare to its closest competitors on price?

Model	Provider	Input /1M	Output /1M	Context
GPT-4o (legacy)	OpenAI	$2.50	$10.00	128K
GPT-5.4 (current)	OpenAI	$2.50	$15.00	400K
GPT-5.4 mini	OpenAI	$0.75	$4.50	400K
Claude Sonnet 4.6	Anthropic	$3.00	$15.00	1M
Claude Haiku 4.5	Anthropic	$1.00	$5.00	200K
Gemini 3 Flash	Google	$0.50	$3.00	1M
Gemini 2.5 Pro	Google	$1.25	$10.00	1M

Monthly Cost Estimates for GPT-4o

Real-world costs depend heavily on your input/output ratio and request volume. Here are estimates for common use cases:

Use Case	Monthly Requests	Avg Tokens/Request	Est. Monthly Cost
Small chatbot	10,000	500 in / 300 out	~$42.50
Customer support	50,000	800 in / 400 out	~$300
Document summarizer	5,000	2,000 in / 500 out	~$75
Code assistant	20,000	1,000 in / 800 out	~$210
High-volume API	500,000	300 in / 200 out	~$1,375

When to Use GPT-4o vs. Cheaper Alternatives

GPT-4o sits in the mid-tier of 2026 pricing — not the cheapest, but not the most expensive. Here's when each tier makes sense:

Use GPT-4o when:

You need reliable, well-rounded performance across reasoning, coding, and language tasks
Your application requires the OpenAI ecosystem (function calling, Assistants API, fine-tuning)
You need a large 128K context window for long documents
Quality is more important than minimizing token costs

Consider GPT-4o mini instead when:

You're running high-volume, repetitive tasks where quality is "good enough"
Your monthly token spend exceeds $500 and margins matter
Latency and cost are more important than peak reasoning ability

Consider Claude Sonnet or Gemini 2.5 Pro when:

You need a longer context window (200K–1M tokens)
Your use case benefits from Anthropic's stronger instruction-following or Google's multimodal capabilities

How to Calculate Your GPT-4o Costs

The formula is straightforward:

      Monthly cost = (Input tokens × $0.0000025) + (Output tokens × $0.00001)

      Example: 10M input tokens + 3M output tokens = $25 + $30 = $55/month

For cached prompts (using OpenAI's prompt caching feature), input tokens are billed at 50% of the standard rate, dropping to $1.25/M — useful for applications that repeat the same system prompt or context across many requests.

GPT-4o Pricing FAQs

Does OpenAI charge for failed API calls?

No. You are only billed for tokens actually processed. If a request fails before processing, there is no charge. If it fails mid-response, you are charged for the tokens generated up to that point.

Are there volume discounts for GPT-4o?

OpenAI's standard API uses pay-as-you-go pricing with no automatic volume discounts. Enterprise customers can negotiate custom pricing. Batch API processing (asynchronous requests) is available at a 50% discount for non-time-sensitive workloads.

How does GPT-4o compare to GPT-4 Turbo?

GPT-4o replaced GPT-4 Turbo as OpenAI's flagship model. It is faster, cheaper, and matches or exceeds GPT-4 Turbo quality across most benchmarks, making GPT-4 Turbo essentially obsolete for new applications.

Calculate exactly what GPT-4o will cost for your specific usage — enter your token counts and get an instant estimate.

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