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Provider profile: OpenAI — OpenAI offers the widest selection of production-ready models, from the GPT-4o multimodal family and o-series reasoning models to specialized variants for image generation, audio, and embeddings.

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OpenAI

US51 models

GPT & o-series — the broadest model portfolio in the industry

OpenAI offers the widest selection of production-ready models, from the GPT-4o multimodal family and o-series reasoning models to specialized variants for image generation, audio, and embeddings.

  • ✓51+ models — the broadest production-ready portfolio in the industry
  • ✓GPT-4o multimodal family with vision, audio, and real-time capabilities
  • ✓o-series reasoning models for math, code, and complex problem solving
  • ✓Responses API support for Cursor IDE and agent frameworks
ReasoningVisionAudioEmbeddingsImage generation

Quickstart

from openai import OpenAI

client = OpenAI(
    base_url="https://api.therouter.ai/v1",
    api_key="YOUR_THEROUTER_KEY",
)

response = client.chat.completions.create(
    model="openai/gpt-4o",
    messages=[{"role": "user", "content": "Summarize the key ideas in quantum computing"}],
    max_tokens=512,
)
print(response.choices[0].message.content)

Models

chatgpt-image-latestImage model used in ChatGPT.GPT-4.1OpenAI's smartest non-reasoning model. Excels at instruction following and tool calling with broad knowledge across domains. Features a 1M token context window and low latency.GPT-4.1 MiniSmaller, faster version of GPT-4.1. Excels at instruction following and tool calling with a 1M token context window and low latency without a reasoning step.GPT-4.1 NanoFastest, most cost-efficient version of GPT-4.1. Excels at instruction following and tool calling with a 1M token context window and minimal latency.GPT-4oOpenAI's versatile, high-intelligence flagship model. Accepts text and image inputs, produces text outputs including structured outputs. Best model for most tasks outside reasoning-heavy use cases.GPT-4o AudioGPT-4o model capable of audio inputs and outputs.GPT-4o MiniFast, affordable small model for focused tasks. Accepts text and image inputs, produces text outputs. Ideal for fine-tuning and cost-efficient workloads.GPT-4o Mini AudioSmaller audio-capable GPT-4o model.
Browse all models →

Frequently Asked Questions

Does TheRouter support the OpenAI Responses API?

Yes. TheRouter supports both the Chat Completions API and the Responses API format used by Cursor IDE and newer agent frameworks. Both formats are automatically detected and routed correctly.

Which OpenAI models are available?

All major production models: GPT-4o, GPT-4o mini, GPT-4.1, GPT-4.1 mini, o3, o4-mini, o4-mini-high, and more. Run GET /v1/models with your TheRouter API key to see the current list.

How does TheRouter handle OpenAI rate limits?

TheRouter manages request queuing and can fall back to alternative providers when OpenAI rate limits are hit, depending on your routing configuration.

Can I use GPT-4o Vision through TheRouter?

Yes. TheRouter's multimodal validation layer passes image_url content blocks directly to OpenAI in the native format. No image conversion needed.