AI Recommendation
Should you use grok-4.5?
grok-4.5 is listed for chat workloads and supports a 8K context window.
Use it when OpenRouter's free tier is enough for evaluation, demos, or light production traffic.
grok-4.5 Free API on OpenRouter
Free API Verified Catalog profile Profile provider catalog metadata
grok-4.5 is available through OpenRouter with 8K context and OpenAI Chat Completions + OpenAI Responses API access.
Free APIOpenAI compatible
Context window 8K
Max output 4K
API format OpenAI Chat Completions + OpenAI Responses
Status Online
Best for
- Chat
Strengths & Weaknesses
Strengths
- Live API verification available
Watch outs
- Free-tier rate limits apply
- Vision support is not listed
- Tool calling is not confirmed
Availability
grok-4.5 availability by provider
We only found this grok-4.5 listing on OpenRouter in the current catalog. Use the related models section for nearby alternatives.
| Provider | Model listing | Access | Context | API | Limits |
|---|---|---|---|---|---|
| | x-ai/grok-4.5 | Free tier | 8K | Native | 200 req/day (free tier) |
Compare
grok-4.5 alternatives to consider
| Model | Provider | Context | Access |
|---|---|---|---|
| Tencent: Hy3 (free) | OpenRouter | 262K | Free tier |
| 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 |
Typical Use Cases
grok-4.5 use cases
Chat
grok-4.5 is tagged for chat in this catalog and works with OpenAI-compatible client libraries.
FAQ
grok-4.5 free API FAQ
Is grok-4.5 free to use?
grok-4.5 is listed with free API access on OpenRouter, subject to the provider's quota and account policy.
What is the grok-4.5 model ID?
The model ID shown in this catalog is x-ai/grok-4.5.
What are the grok-4.5 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 grok-4.5 support?
The listed context window is 8K tokens with up to 4K output tokens.