AI Recommendation
Should you use GPT-4o?
GPT-4o is listed for chat workloads and supports a 128K context window.
Use it when OpenRouter's free tier is enough for evaluation, demos, or light production traffic.
GPT-4o Free API on OpenRouter
Free API Verified Catalog metadata matched Tool use models.dev metadata
Omni-era GPT for multimodal chat, practical coding, and general assistants
Free APIOpenRouter nativeTool callingJSON modePDF inputVision
Context window 128K
Max output 16K
API format OpenRouter native
Status Online
Best for
- Chat
Strengths & Weaknesses
Strengths
- Long context window
- Tool calling support
- Structured JSON output
- Live API verification available
Watch outs
- Free-tier rate limits apply
Pricing
GPT-4o pricing per 1M tokens
Input $2.5 per 1M tokens
Output $10 per 1M tokens
Free access Available OpenRouter
Rate limit 200 req/day (free tier) provider policy
Availability
GPT-4o availability by provider
We only found this GPT-4o listing on OpenRouter in the current catalog. Use the related models section for nearby alternatives.
| Provider | Model listing | Access | Context | API | Limits |
|---|---|---|---|---|---|
| | GPT-4o | Free tier | 128K | Native | 200 req/day (free tier) |
Compare
GPT-4o alternatives to consider
| Model | Provider | Context | Access |
|---|---|---|---|
| Poolside: Laguna XS 2.1 (free) | OpenRouter | 262K | Free tier |
| Cohere: North Mini Code (free) | OpenRouter | 256K | Free tier |
| NVIDIA: Nemotron 3.5 Content Safety (free) | OpenRouter | 128K | Free tier |
| NVIDIA: Nemotron 3 Ultra (free) | OpenRouter | 1.0M | Free tier |
| NVIDIA: Nemotron 3 Nano Omni (free) | OpenRouter | 256K | Free tier |
Typical Use Cases
GPT-4o use cases
Chat
GPT-4o is tagged for chat in this catalog.
FAQ
GPT-4o free API FAQ
Is GPT-4o free to use?
GPT-4o is listed with free API access on OpenRouter, subject to the provider's quota and account policy.
What is the GPT-4o model ID?
The model ID shown in this catalog is openai/gpt-4o.
What are the GPT-4o free tier rate limits on OpenRouter?
The listed free tier limit is 200 req/day (free tier). Limits can change per account tier, so confirm against the provider dashboard.
What context window does GPT-4o support?
The listed context window is 128K tokens with up to 16K output tokens.
More about GPT-4o
Free GPT-4o API.
For API keys, setup steps, and provider-level limits, see the OpenRouter provider page.