Rerank v4.0 Pro on Cohere
Cohere Free API tier
The catch: Only 1,000 calls a month across all endpoints, trial keys may not be used for production or commercial work, and trial data falls under the general Terms of Use, which let Cohere use it to improve its services.
| Access | Free API tier |
|---|---|
| Free limits | Trial key: Rerank 10 requests/min, within the 1,000 API calls a month trial cap. A reranking model (scores documents against a query), not a chat model. |
| Modality | text |
| Credit card | Not required |
| Commercial use | Not allowed |
| Trains on your data | Yes, on the free tier |
| Licence or terms | Cohere Terms of Use (last updated 7 Sep 2022) and Usage Policy |
| Context window | 32,000 tokens |
| Model id | rerank-v4.0-pro |
| Base URL | https://api.cohere.com/v2 |
| Last checked | 8 Oct 2026 |
How to use Rerank v4.0 Pro
It speaks the OpenAI API at https://api.cohere.com/v2, so the OpenAI SDK you already use works once you change the base URL and key.
curl https://api.cohere.com/v2/rerank -H "Authorization: Bearer $CO_API_KEY" -H "Content-Type: application/json" -d '{"model":"rerank-v4.0-pro","query":"What is the capital of the United States?","documents":["Carson City is the capital of Nevada.","Washington, D.C. is the capital of the United States."],"top_n":1}'I want to use the free AI model "Rerank v4.0 Pro" from Cohere (model id: rerank-v4.0-pro) in my project. Please: 1. Check the provider docs and give me the exact steps to get a free API key. 2. Give me a minimal working example that reads the key from an environment variable. 3. Tell me the real free limits and any catch (commercial use, card, data use). Listed limits: 10 RPM · 1,000 calls a month. 4. If the same provider has a more generous free option, mention it.
Before you ship on it
- Only 1,000 calls a month across all endpoints, trial keys may not be used for production or commercial work, and trial data falls under the general Terms of Use, which let Cohere use it to improve its services.
- Prompts on the free tier may be used to train models. Keep customer data off it.
- cohere.com/pricing FAQ: 'API calls made from a Trial API key are free. However, trial keys are rate limited and are not permitted to be used for production or commercial purposes.' Production use needs a paid production…
- Free tiers are shared capacity: treat the limits as a ceiling, not a promise, and keep a paid fallback.
Questions
Is Rerank v4.0 Pro on Cohere free?
Yes. Cohere offers it as free api tier, with these limits: 10 RPM · 1,000 calls a month. No credit card is needed.
Can I use Rerank v4.0 Pro on Cohere commercially?
No: the free access is for testing or non-commercial use. A paid plan is needed for production.
How do I start with Rerank v4.0 Pro on Cohere?
It speaks the OpenAI API at https://api.cohere.com/v2, so the OpenAI SDK you already use works once you change the base URL and key.
Source: docs.cohere.com/docs/rate-limits, checked 8 Oct 2026.