Balanced Claude model for coding, analysis, agent workflows, and cost control
Claude Sonnet 4.5 (latest) is listed for chat workloads and supports a 200K context window.
Use it when OpenRouter's free tier is enough for evaluation, demos, or light production traffic.
We only found this Claude Sonnet 4.5 (latest) listing on OpenRouter in the current catalog. Use the related models section for nearby alternatives.
| Provider | Model listing | Access | Context | API | Limits |
|---|---|---|---|---|---|
| | Claude Sonnet 4.5 (latest) | Free tier | 200K | Native | 200 req/day (free tier) |
| 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 |
Claude Sonnet 4.5 (latest) is tagged for chat in this catalog.
Claude Sonnet 4.5 (latest) is listed with free API access on OpenRouter, subject to the provider's quota and account policy.
The model ID shown in this catalog is anthropic/claude-sonnet-4.
The listed free tier limit is 200 req/day (free tier). Limits can change per account tier, so confirm against the provider dashboard.
The listed context window is 200K tokens with up to 64K output tokens.
Free Claude Sonnet 4.5 (latest) API.
For API keys, setup steps, and provider-level limits, see the OpenRouter provider page.