# CoreWeave vs OpenAI API: who uses which

On usedby, 18 companies use CoreWeave and 37 use OpenAI API. 1 company uses both, including Mercado Libre. Counts include every proof level, job-post signals included; each company keeps its proof level on each side. Latest check 2026-10-18: 54 of 55 public lines checked.

## Side by side

|  | [CoreWeave](https://www.usedby.ai/tools/coreweave.md) | [OpenAI API](https://www.usedby.ai/tools/openai-api.md) |
|---|---|---|
| Public customers | 18 | 37 |
| Confirmed | 7 | 3 |
| Observed | 11 | 33 |
| Signals (job posts) | 0 | 1 |
| Top industries of customers (every proof level) | Artificial Intelligence (8), Agriculture & AgTech (1), Automotive Manufacturing (1) | DevTools & Infrastructure (6), Artificial Intelligence (4), Marketplace (4) |
| Category | AI inference & GPU cloud | Foundation models & model APIs |
| Data processing terms | A data processing agreement is available. ([docs.coreweave.com](https://docs.coreweave.com/policies/terms-of-service/privacy-policy), checked 2026-10-07) | — |
| Free trial | Free trial or free plan available. ([coreweave.com](https://www.coreweave.com/forge-pricing), checked 2026-10-07) | — |

## Companies that use both

Every proof level counts; the proof level of each side is shown, strongest proofs first. The first public proof is not an adoption date.

| Company | Proof, CoreWeave | Proof, OpenAI API | First public proof, OpenAI API |
|---|---|---|---|
| [Mercado Libre](https://www.usedby.ai/companies/mercado-libre.md) | Confirmed | Observed | On or before October 2026 |

## Published results

Reviewed stories only; usedby did not measure the figures.

- CoreWeave: [Mercado Libre](https://www.usedby.ai/case-studies/mercado-libre-coreweave.md): **three weeks**: “The team went from POC to production in three weeks.” (published 2026-07-02)
- CoreWeave: [NovelAI](https://www.usedby.ai/case-studies/novelai-coreweave.md): **75%**: “saving 75% in cloud costs” (published 2026-10-06)

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Source: https://www.usedby.ai/compare/coreweave-vs-openai-api · How we check: https://www.usedby.ai/methodology