How much does the GPT-4o API cost?

GPT-4o costs $2.5 per million input tokens and $10 per million output tokens, with cached input at $1.25 per million. A workload of 10M input and 1.5M output tokens per month costs about $40.00.

What is the context window of GPT-4o?

GPT-4o supports a context window of 128,000 tokens (128K), with up to 16K output tokens per response.

Is GPT-4o open source?

No — GPT-4o is a proprietary model available through OpenAI's API and partner platforms.

What are the best alternatives to GPT-4o?

The closest alternatives by overall capability are Qwen3-Max, Gemini 3 Pro, Gemini 2.5 Pro, DeepSeek V3.2. See the comparison pages for detailed head-to-head breakdowns.

GPT-4o

Name: GPT-4o
Price: 2.5 USD
Author: OpenAI

OpenAI·May 2024proprietary

GPT-4o ("omni") was the first OpenAI model to natively handle text, image and audio in one network, powering real-time voice experiences. It is two generations behind the frontier now and comparatively expensive for its capability, but its real-time audio pipeline and enormous installed base keep it relevant. Teams starting today usually pick GPT-5 mini or GPT-5.2 instead unless they specifically need 4o's voice stack.

Benchmark results

Where it shines

Native real-time audio input and output
Huge ecosystem familiarity and tooling support
Stable, well-known failure modes

Alternatives to GPT-4o

Qwen3-Max

Alibaba's trillion-parameter API flagship — frontier-adjacent quality with strong agentic tool use at mid-tier prices.

Gemini 3 Pro

Google's November 2025 frontier breakout — 91.9% GPQA Diamond and 37.5% HLE made it the reasoning leader of its generation.

Gemini 2.5 Pro

Google's 2025 workhorse flagship — first mainstream thinking model with a 1M context, still widely deployed.

DeepSeek V3.2

The sparse-attention release that halved DeepSeek's already-lowest-in-class prices while keeping GPT-class quality.

Frequently asked questions

How much does the GPT-4o API cost?: GPT-4o costs $2.5 per million input tokens and $10 per million output tokens, with cached input at $1.25 per million. A workload of 10M input and 1.5M output tokens per month costs about $40.00.
What is the context window of GPT-4o?: GPT-4o supports a context window of 128,000 tokens (128K), with up to 16K output tokens per response.
Is GPT-4o open source?: No — GPT-4o is a proprietary model available through OpenAI's API and partner platforms.
What are the best alternatives to GPT-4o?: The closest alternatives by overall capability are Qwen3-Max, Gemini 3 Pro, Gemini 2.5 Pro, DeepSeek V3.2. See the comparison pages for detailed head-to-head breakdowns.