# Mistral vs OpenAI API: who uses which

On usedby, 42 companies use Mistral and 37 use OpenAI API. 1 company uses both, including Cisco. Counts include every proof level, job-post signals included; each company keeps its proof level on each side. Latest check 2026-10-18: 77 of 79 public lines checked.

## Side by side

|  | [Mistral](https://www.usedby.ai/tools/mistral.md) | [OpenAI API](https://www.usedby.ai/tools/openai-api.md) |
|---|---|---|
| Public customers | 42 | 37 |
| Confirmed | 36 | 3 |
| Observed | 6 | 33 |
| Signals (job posts) | 0 | 1 |
| Top industries of customers (every proof level) | Banking & Mortgages (4), Aerospace & Defense (3), Data & Analytics (3) | DevTools & Infrastructure (6), Artificial Intelligence (4), Marketplace (4) |
| Category | Foundation models & model APIs | Foundation models & model APIs |
| Security | ISO 27001, ISO 27701, SOC 2 Type II ([trust.mistral.ai](https://trust.mistral.ai/), checked 2026-10-04) | — |
| Data processing terms | A data processing agreement is available. ([legal.mistral.ai](https://legal.mistral.ai/terms/data-processing-addendum/), checked 2026-10-04) | — |
| Free trial | Free trial or free plan available. ([mistral.ai](https://mistral.ai/pricing/), checked 2026-10-04) | — |
| Pricing | Free: $0; Pro: $14.99 /mo; Team: $24.99 /user/mo; Enterprise: contact sales ([mistral.ai](https://mistral.ai/pricing/), checked 2026-10-04) | — |

## 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, Mistral | Proof, OpenAI API | First public proof, OpenAI API |
|---|---|---|---|
| [Cisco](https://www.usedby.ai/companies/cisco.md) | Observed | Observed | On or before October 2026 |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Mistral: [Synapse Medicine](https://www.usedby.ai/case-studies/synapse-medicine-mistral.md): **30%**: “With over 30% of French general practitioners and 300 hospitals relying on Synapse” (published 2026-04-24)
- Mistral: [SNCF](https://www.usedby.ai/case-studies/sncf-group-mistral.md): **100,000 employees**: “The Groupe SNCF GPT has been deployed to over 100,000 employees” (published 2026-04-24)

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