OpenAI Agents SDK vs Retell AI
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
OpenAI Agents SDK is the stronger AI pick in AI Agents: it has a visibility score of 31.4 versus 2 for Retell AI, and ranks ahead in 100% of the answers that name both.
Choose OpenAI Agents SDK if…
- You want the brand AI engines rank higher (31.4 vs 2)
- You need SOC 2 Type 2 or ISO/IEC 27001:2022 or ISO/IEC 27701:2019 or CSA STAR Level 1 coverage
- Widely adopted platform for enterprise and developer agents
- Streamlined framework for native GPT integration and function calling
Choose Retell AI if…
- You need a self-hosted or on-premises option
- You need HIPAA or SOC 2 Type II or GDPR or ISO 27001 coverage
- Highly rated by developers and SMBs
- One of the highest customer star ratings
AI visibility side by side
Latest weekly run · Nov 3
| Metric | OpenAI Agents SDK | Retell AI |
|---|---|---|
| Visibility score | 31.4% | 2% |
| Change vs last week | New | New |
| Rank in AI Agents | #2 | #42 |
| Share of voice | 5.8% | 0.5% |
| Mentions this run | 38 | 3 |
| Positive in AI answers | 45% | — |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
OpenAI Agents SDK 0pp · Retell AI 0pp over 0 weekly runs.
Engine by engine
OpenAI Agents SDK leads on 3 of 3 engines
Head to head in AI answers
2 engine answers name both brands
| Prompt | Engine | OpenAI Agents SDK | Retell AI |
|---|---|---|---|
| What are the best AI Agents tools in 2026? | Perplexity | #9 | #13 |
| Which AI agent platform has the best reviews? | AI Mode | #1 | #4 |
Features, pricing & fit
| Dimension | OpenAI Agents SDK | Retell AI |
|---|---|---|
| Pricing model | — | Usage-based |
| Entry price | — | Contact sales |
| Free plan | — | Yes |
| Deployment | Runs inside the customer's own application; the customer controls deployment, storage and approvals. | Cloud platform, with enterprise on-premises deployment available |
| Compliance | SOC 2 Type 2, ISO/IEC 27001:2022, ISO/IEC 27701:2019, CSA STAR Level 1 | HIPAA, SOC 2 Type II, GDPR, ISO 27001 |
| Support | — | Community and email support, 24/7 omnichannel support with dedicated portal (Enterprise), Dedicated implementation support (Enterprise), Named account manager (Enterprise) |
| Founded | — | 2023 |
| Headquarters | 1455 and 1515 Third Street, San Francisco | Redwood City, California |
| Employees | — | 51–200 |
| Funding | $122 billion round closed March 31, 2026 at $852 billion post-money, anchored by Amazon, Nvidia and SoftBank · $180000M raised | Seed · $5M raised |
| Best for | Teams already building on OpenAI models that want a lightweight framework to write their own agent logic. | Businesses that run high call volumes in healthcare, insurance, financial services, logistics and similar fields, and teams that want to build and change voice agents themselves. |
Plans side by side
OpenAI Agents SDK
Pricing not available.
Retell AI
Pros and cons
Themes from the AI answers that mention each brand
OpenAI Agents SDK
- Widely adopted platform for enterprise and developer agents
- Streamlined framework for native GPT integration and function calling
- Good for rapid prototyping
- Access to foundational models and agent workflows via the OpenAI Platform
- A framework rather than a complete enterprise automation suite
- Requires separate payment for OpenAI model API usage
Retell AI
- Highly rated by developers and SMBs
- One of the highest customer star ratings
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “OpenAI Agents SDK vs Retell AI”, https://slateindex.ai/compare/openai-agents-sdk-vs-retell-ai, data of Nov 3, 2026. Licence: CC BY 4.0.