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API Pricing

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Pricing below reflects standard processing rates. To optimize cost and performance for different use cases, we also offer:

Flagship models

Our frontier models designed to spend more time thinking before producing a response, making them ideal for complex, multi-step problems.

GPT-5

The best model for coding and agentic tasks across industries

Price

Input:
$1.250 / 1M tokens
Cached input:
$0.125 / 1M tokens
Output:
$10.000 / 1M tokens

GPT-5 mini

A faster, cheaper version of GPT-5 for well-defined tasks

Price

Input:
$0.250 / 1M tokens
Cached input:
$0.025 / 1M tokens
Output:
$2.000 / 1M tokens

GPT-5 nano

The fastest, cheapest version of GPT-5—great for summarization and classification tasks

Price

Input:
$0.050 / 1M tokens
Cached input:
$0.005 / 1M tokens
Output:
$0.400 / 1M tokens

Fine-tuning our models

Customize our models to get even higher performance for your specific use cases.

GPT-4.1

Fine-tuning price

Input:
$3.00 / 1M tokens
Cached input:
$0.75 / 1M tokens
Output:
$12.00 / 1M tokens
Training:
$25.00 / 1M tokens

GPT-4.1 mini

Fine-tuning price

Input:
$0.80 / 1M tokens
Cached input:
$0.20 / 1M tokens
Output:
$3.20 / 1M tokens
Training:
$5.00 / 1M tokens

GPT-4.1 nano

Fine-tuning price

Input:
$0.20 / 1M tokens
Cached input:
$0.05 / 1M tokens
Output:
$0.80 / 1M tokens
Training:
$1.50 / 1M tokens

o4-mini

Reinforcement fine-tuning price

Input:
$4.00 / 1M tokens
Cached input:
$1.00 / 1M tokens
Output:
$16.00 / 1M tokens
Training:
$100.00 / training hour

Our APIs

Realtime API

Build low-latency, multimodal experiences including speech-to-speech.

GPT-4o
$5.00 / 1M input tokens
$2.50 / 1M cached input tokens
$20.00 / 1M output tokens
GPT-4o mini
$0.60 / 1M input tokens
$0.30 / 1M cached input tokens
$2.40 / 1M output tokens

Image Generation API

Precise, high-fidelity image generation and editing with our latest multimodal model.

GPT-image-1
$5.00 / 1M input tokens
$1.25 / 1M cached input tokens*
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GPT-image-1
$10.00 / 1M input tokens
$2.50 / 1M cached input tokens*
$40.00 / 1M output tokens
Prompts are billed similarly to other GPT models. Image outputs cost approximately $0.01 (low), $0.04 (medium), and $0.17 (high) for square images.
*available via the Responses API
For detailed token usage by image quality and size, see the docs.

Responses API

Our newest API combining the simplicity of Chat Completions with the built-in tool use of Assistants.

Price
Responses API is not priced separately. Tokens are billed at the chosen language model’s input and output rates.

Chat Completions API

Build text-based conversational experiences.

Price
Chat Completions API is not priced separately. Tokens are billed at the chosen language model's input and output rates.

Assistants API

Build assistant-like experiences with our tools.

Price
Assistants API is not priced separately. Tokens are billed at the chosen language model's input and output rates.

Built-in tools

Extend model capabilities with built-in tools in the API Platform.

Code Interpreter
$0.03
File Search Storage
$0.10 / GB of vector storage per day (first GB free)
File Search Tool Call (Responses API only)
$2.50 / 1k tool calls
Web Search Tool Call
The tokens used for built-in tools are billed at the chosen model's per-token rates.
Web search content tokens: Search content tokens are tokens retrieved from the search index and fed to the model alongside your prompt to generate an answer. For gpt-4o and gpt-4.1 models, these tokens are included in the $25/1K calls cost. For o3 and o4-mini models, search content tokens are charged at model rate.
ModelsSearch ContentCost
gpt-4o, gpt-4o-mini, gpt-4.1, and gpt-4.1-mini-models*Search content tokens free$25.00 / 1K calls
GPT-5, GPT-5-mini, GPT-5-nano, o3, o4-mini, o3-pro, and deep research modelsSearch content tokens billed at model rate$10.00 / 1K calls
The billing dashboard will report gpt-4.1 and gpt-4.1-mini search line items as ‘web search tool calls | gpt-4o’ and ‘web search tool calls | gpt-4o-mini’
GB refers to binary gigabytes of storage (also known as gibibyte), where 1GB is 2^30 bytes.

Explore our offerings for Enterprise customers: Priority processing⁠, Scale Tier⁠⁠ and Reserved Capacity⁠⁠.

FAQ

We recommend that developers use our large and mini GPT models for everyday tasks. Our large GPT models generally perform better on a wide range of tasks, while our mini GPT models are fast and inexpensive for simpler tasks.

Our large and mini reasoning models are ideal for complex, multi-step tasks and STEM use cases that require deep thinking about tough problems. You can choose the mini reasoning model if you're looking for a faster, more inexpensive option.

We recommend experimenting with all of these models in the Playground⁠⁠(opens in a new window) to explore which models provide the best price performance trade-off for your usage.

Start creating with OpenAI’s powerful models.

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