GPT-4o is OpenAI’s flagship multimodal model, balancing low latency with strong performance across text, vision, and tool-use tasks. It’s the default choice for teams already building against the OpenAI API who want lower cost per token without giving up capability.

Model specifications

Specification	Value
Provider	OpenAI
Context length	128,000 tokens
Input pricing	$2.50 per million tokens
Output pricing	$10.00 per million tokens
Capabilities	Reasoning, coding, tool use, vision

Aniron routes to GPT-4o using the model string openai/gpt-4o. Since Aniron’s API is already OpenAI-compatible, requests that currently hit api.openai.com need only a baseURL and model change — no SDK rewrite.

What it’s good for

Creative and conversational tasks where response tone matters, general-purpose coding assistance, and multimodal use cases that combine text with image input. Its 128K context window comfortably covers most single-document RAG and long-conversation workloads without the overhead of a larger-context model.

Example usage

import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://api.aniron.ai/v1',
  apiKey: process.env.ANIRON_KEY,
});

const response = await client.chat.completions.create({
  model: 'openai/gpt-4o',
  messages: [{ role: 'user', content: 'Summarize this contract in three bullet points.' }],
  max_tokens: 2000,
});

Compare with

vs Claude Sonnet 4: Sonnet 4 costs $3 input / $15 output (roughly 20-50% more) but offers a 200K context window (56% larger) and stronger multi-step reasoning. Pick GPT-4o for cost-sensitive, high-volume workloads under 128K tokens. Pick Sonnet 4 when context length or reasoning depth matters more than per-token cost.

vs Llama 3.1 70B: Llama 3.1 70B is dramatically cheaper for teams that can tolerate a capability gap on complex reasoning and don’t need vision input. Pick GPT-4o when output quality and multimodal support are non-negotiable.

FAQ

How much does GPT-4o cost through Aniron vs OpenAI direct?

Aniron charges $2.50 per million input tokens, $10.00 per million output — the same list price OpenAI charges. The difference is billing: Aniron draws from one prepaid balance shared across GPT-4o and 40+ other models, instead of a separate OpenAI invoice.

Does streaming work?

Yes. Set stream: true in the request and consume the response as server-sent events, identical to calling OpenAI directly.

Can I send images?

Yes. GPT-4o accepts image content in the messages array using the same image_url format as the OpenAI API.

What’s the rate limit?

Default is 60 requests per minute per API key. Contact support to raise it for production workloads.

GPT-4o vs Claude Sonnet 4 — Compare pricing, context length, and capabilities side by side.

Getting Started Guide — Set up your first request to Aniron in 5 minutes.

Model Fallbacks — Set backup models per request with automatic retry logic.

GPT-4o