Together AI

Open-source LLM inference and fine-tuning platform for enterprise AI builders

OpenAI API

API platform for GPT, DALL-E, Whisper and other foundation models

Together AI

Caution

10/25

OpenAI API

Moderate

14/25

Score Breakdown

DimensionTogether AIOpenAI API

Data Residency

Where is your data stored and processed?

Together AI: All inference and fine-tuning workloads processed in US data centres. No EU data residency option. GDPR transfer mechanisms (SCCs) required for European personal data processing.

OpenAI API: All data processed on US-based Microsoft Azure infrastructure. No EU data residency option available. Enterprise customers cannot choose hosting region.

1/5

All inference and fine-tuning workloads processed in US data centres. No EU data residency option. GDPR transfer mechanisms (SCCs) required for European personal data processing.

2/5

All data processed on US-based Microsoft Azure infrastructure. No EU data residency option available. Enterprise customers cannot choose hosting region.

Legal Jurisdiction

Which laws govern the company and your data?

Together AI: Incorporated in Delaware, US. Subject to CLOUD Act. GDPR DPA available for enterprise customers contractually, but US jurisdiction governs. No EU subsidiary structure.

OpenAI API: US Delaware LLC subject to US jurisdiction including CLOUD Act. Offers GDPR-compliant DPA for EU customers, but legal entity is solely US-based.

2/5

Incorporated in Delaware, US. Subject to CLOUD Act. GDPR DPA available for enterprise customers contractually, but US jurisdiction governs. No EU subsidiary structure.

2/5

US Delaware LLC subject to US jurisdiction including CLOUD Act. Offers GDPR-compliant DPA for EU customers, but legal entity is solely US-based.

Data Retention & Training

Is your data used for model training?

Together AI: Clear policy that customer data and fine-tuning datasets are not used to train shared models. Fine-tuned model weights are customer property. Good baseline for data isolation, but residency limitation remains.

OpenAI API: API data not used for model training by default. Zero data retention option available. Clear data retention policies documented. Abuse monitoring data retained for 30 days.

4/5

Clear policy that customer data and fine-tuning datasets are not used to train shared models. Fine-tuned model weights are customer property. Good baseline for data isolation, but residency limitation remains.

4/5

API data not used for model training by default. Zero data retention option available. Clear data retention policies documented. Abuse monitoring data retained for 30 days.

Certifications

ISO 27001, SOC 2, Cyber Essentials, etc.

Together AI: No published ISO 27001, SOC 2 Type II, or independent security certifications as of early 2026. Security practices are self-attested. Significant gap for enterprise procurement in regulated industries.

OpenAI API: SOC 2 Type II certified. GDPR DPA available. No ISO 27001 or C5 certification publicly disclosed.

1/5

No published ISO 27001, SOC 2 Type II, or independent security certifications as of early 2026. Security practices are self-attested. Significant gap for enterprise procurement in regulated industries.

3/5

SOC 2 Type II certified. GDPR DPA available. No ISO 27001 or C5 certification publicly disclosed.

Regulatory Fit

Suitability for regulated industries and professional services

Together AI: Not suitable for GDPR-regulated personal data processing without SCCs and TIA. Good for development, prototyping, and non-personal-data AI workloads. US jurisdiction and absence of certifications limit suitability for regulated EU industries.

OpenAI API: Suitable for many business use cases with appropriate DPA. Enterprise tier offers enhanced compliance. Not ideal for highly regulated EU industries requiring data sovereignty.

2/5

Not suitable for GDPR-regulated personal data processing without SCCs and TIA. Good for development, prototyping, and non-personal-data AI workloads. US jurisdiction and absence of certifications limit suitability for regulated EU industries.

3/5

Suitable for many business use cases with appropriate DPA. Enterprise tier offers enhanced compliance. Not ideal for highly regulated EU industries requiring data sovereignty.

Total Score

10/25

14/25

Best For

Together AI

Best for privacy-conscious teams who need strong data retention controls; teams on a tight budget; enterprises requiring SSO integration.

OpenAI API

Best for privacy-conscious teams who need strong data retention controls; teams on a tight budget.

Detailed Comparison

OpenAI API vs Together AI: Trust & Compliance Comparison

OpenAI API (OpenAI, US) scores 14/25 overall with a Bronze (Moderate) trust badge. API platform for GPT, DALL-E, Whisper and other foundation models. Together AI (Together AI, US) scores 10/25 with a Review Required (Caution) trust badge. Open-source LLM inference and fine-tuning platform for enterprise AI builders.

Dimension-by-Dimension Breakdown

#### Data Residency

OpenAI API leads with 2/5 vs 1/5.

●OpenAI API (2/5): All data processed on US-based Microsoft Azure infrastructure. No EU data residency option available. Enterprise customers cannot choose hosting region.

●Together AI (1/5): All inference and fine-tuning workloads processed in US data centres. No EU data residency option. GDPR transfer mechanisms (SCCs) required for European personal data processing.

#### Legal Jurisdiction

Both score equally at 2/5.

●OpenAI API (2/5): US Delaware LLC subject to US jurisdiction including CLOUD Act. Offers GDPR-compliant DPA for EU customers, but legal entity is solely US-based.

●Together AI (2/5): Incorporated in Delaware, US. Subject to CLOUD Act. GDPR DPA available for enterprise customers contractually, but US jurisdiction governs. No EU subsidiary structure.

#### Data Retention & Training

Both score equally at 4/5.

●OpenAI API (4/5): API data not used for model training by default. Zero data retention option available. Clear data retention policies documented. Abuse monitoring data retained for 30 days.

●Together AI (4/5): Clear policy that customer data and fine-tuning datasets are not used to train shared models. Fine-tuned model weights are customer property. Good baseline for data isolation, but residency limitation remains.

#### Certifications

OpenAI API leads with 3/5 vs 1/5.

●OpenAI API (3/5): SOC 2 Type II certified. GDPR DPA available. No ISO 27001 or C5 certification publicly disclosed.

●Together AI (1/5): No published ISO 27001, SOC 2 Type II, or independent security certifications as of early 2026. Security practices are self-attested. Significant gap for enterprise procurement in regulated industries.

#### Regulatory Fit

OpenAI API leads with 3/5 vs 2/5.

●OpenAI API (3/5): Suitable for many business use cases with appropriate DPA. Enterprise tier offers enhanced compliance. Not ideal for highly regulated EU industries requiring data sovereignty.

●Together AI (2/5): Not suitable for GDPR-regulated personal data processing without SCCs and TIA. Good for development, prototyping, and non-personal-data AI workloads. US jurisdiction and absence of certifications limit suitability for regulated EU industries.

Certifications at a Glance

Certification	OpenAI API	Together AI
GDPR DPA	Yes	No
SOC 2 Type II	Yes	No

Overall Verdict

OpenAI API has a clear trust advantage, scoring 14/25 compared to Together AI's 10/25. OpenAI API particularly excels in data residency, certifications, regulatory fit.

Frequently Asked Questions

Which is better for EU compliance, Together AI or OpenAI API?

Together AI has a TrustKit score of 10/25 while OpenAI API scores 14/25. OpenAI API currently rates higher across data residency, legal jurisdiction, data retention, certifications, and regulatory fit.

How do Together AI and OpenAI API compare on data residency?

Together AI scores 1/5 for data residency (All inference and fine-tuning workloads processed in US data centres. No EU data residency option. GDPR transfer mechanisms (SCCs) required for European personal data processing.), while OpenAI API scores 2/5 (All data processed on US-based Microsoft Azure infrastructure. No EU data residency option available. Enterprise customers cannot choose hosting region.).

Are Together AI and OpenAI API GDPR compliant?

Both tools are assessed across five compliance dimensions. Together AI has a regulatory fit score of 2/5 and OpenAI API scores 3/5. Check the full comparison above for a detailed breakdown.

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