OpenAI models - Monica API Platform

OpenAI models are a series of powerful language models developed by OpenAI.

Using the API

Use Chat completion API to call OpenAI models. See the pricing page for pricing details.

OpenAI models comparison

Feature	GPT-5.3 Codex	GPT-5	GPT-4.1	GPT-4.1-mini	GPT-4.1-nano	GPT-4o	GPT-4o-mini	o4-mini
API model key	`gpt-5.3-codex`	`gpt-5`	`gpt-4.1`	`gpt-4.1-mini`	`gpt-4.1-nano`	`gpt-4o`	`gpt-4o-mini`	`o4-mini`
Description	OpenAI’s most capable coding model	Latest GPT-5 model	Mainstream GPT-4.1	Lightweight GPT-4.1	Ultra-light GPT-4.1	Latest GPT-4o model	Lightweight GPT-4o	Cost-effective GPT-o
Current version	`gpt-5.3-codex`	`gpt-5`	`gpt-4.1`	`gpt-4.1-mini-2024-07-18`	`gpt-4.1-nano-2024-07-18`	`gpt-4o-2024-11-20`	`gpt-4o-mini-2024-07-18`	`o4-mini`
Best for	Coding tasks across the full development workflow	Advanced reasoning and complex problem-solving	General reasoning	Efficient general-purpose tasks	Fast, low-cost tasks	Complex reasoning and creative tasks	Efficient general-purpose tasks	Budget-friendly tasks
Vision capability	Yes	Yes (Enhanced)	No	No	No	Yes	Yes (see note)	No
Tool calls	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Context window	400K tokens	400K tokens	128K tokens	128K tokens	128K tokens	128K tokens	128K tokens	128K tokens
Max output	128K tokens	32K tokens	8K tokens	8K tokens	8K tokens	16K tokens	16K tokens	8K tokens
Knowledge cutoff	Aug 2025	Jun 2024	Oct 2023	Oct 2023	Oct 2023	Oct 2023	Oct 2023	Oct 2023

Important notes

Vision capability

Both GPT-4o and GPT-4o-mini support vision capabilities, allowing them to process and analyze images
⚠️ Known issue with GPT-4o-mini: There are tokenization issues when processing images with GPT-4o-mini that may result in unexpectedly high input token counts. For vision tasks at this price point, we recommend using Claude 3 Haiku instead.

Model versions and aliases

GPT-5.3 Codex

gpt-5.3-codex - OpenAI’s most capable coding model, covering the full development workflow from writing to debugging and deployment

GPT-4.1

gpt-4.1 - Mainstream GPT-4.1 model
gpt-4.1-mini - Points to the current recommended version (currently gpt-4.1-mini-2024-07-18)
gpt-4.1-mini-2024-07-18 - Specific version
gpt-4.1-nano - Points to the current recommended version (currently gpt-4.1-nano-2024-07-18)
gpt-4.1-nano-2024-07-18 - Specific version

GPT-4o

gpt-4o - Points to the current recommended version (currently gpt-4o-2024-11-20)
gpt-4o-2024-11-20 - Specific version

GPT-4o-mini

gpt-4o-mini - Points to the current recommended version (currently gpt-4o-mini-2024-07-18)
gpt-4o-mini-2024-07-18 - Specific version

o4-mini & o4 series models

o4-mini - Cost-effective GPT-o model
o4 series models (such as o4-mini) include reasoning steps in their responses. This means they may generate more detailed explanations and therefore consume more output tokens than other models. Please consider this when planning your token budget.

Official documentation

Vision Guide - Learn more about using vision capabilities

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