Chatbots · Head-to-head
Retell AI vs GPT-6.1 Sol
Retell AI (freemium, AI Score 8.9/10) vs GPT-6.1 Sol (paid, AI Score 8.8/10). Side-by-side pricing, features, pros and cons, and which to pick.
The verdict
Pick Retell AI if…
- →you need a genuinely free option
- →budget is the constraint
- →your primary use case is developer teams building production phone-based voice ai agents for customer service at scale.
- →you need: agents, development, support
Side-by-side specs
| Spec | Retell AI | GPT-6.1 Sol |
|---|---|---|
| Category | Chatbots | Chatbots |
| Pricing model | freemium | paid |
| Headline pricing | Free $10 credit, then ~$0.07/min usage-based | $2/$10 per 1M tokens (input/output); cached input $0.10/1M; paid ChatGPT Work/Codex |
| Free tier | $10 free credit to test the platform — enough for roughly 140 minutes of calls | — |
| AI Score | 8.9/10 | 8.8/10 |
| Best for | Developer teams building production phone-based voice AI agents for customer service at scale. | — |
| Editor's pick | ✓ Yes | ✓ Yes |
| Use cases | agents development support | — |
| Date added | 2026-05-01 | 2026-10-06 |
Pros and cons
Retell AI
Chatbots · freemium
Pros
- ✓Sub-800ms latency makes conversations feel genuinely natural, not robotic
- ✓HIPAA-compliant with enterprise security certifications for regulated industries
- ✓Bring-your-own-LLM means you're not locked into a single AI provider
- ✓Extensive telephony features including call transfer, voicemail detection, and SIP support
Cons
- ×Requires developer skills — no true no-code builder for non-technical users
- ×Usage-based pricing can get expensive at high call volumes without enterprise negotiation
- ×Voice customization options are more limited than dedicated TTS platforms like ElevenLabs
- ×Documentation could be more thorough for advanced use cases like custom SIP integrations
GPT-6.1 Sol
Chatbots · paid
Pros
- ✓Launch positioning is near-Astra quality at roughly one-fifth the price
- ✓Cached input at $0.10 per million tokens for repeated agent context
- ✓Built for agentic coding and computer use, not only chat
- ✓Reachable from the API and from paid ChatGPT Work/Codex without a extra product login
Cons
- ×Still the mid-tier GPT-6 SKU; Astra remains the flagship
- ×Not on free ChatGPT — Work, Codex, or API only
- ×Independent public eval tables are thinner than the launch narrative; treat 'near-Astra' as OpenAI's claim
- ×A poor fit if you only need a consumer chatbot and do not run agents or computer use
Related comparisons
Updated 2026-10-06. Spec data sourced from official product pages and tracked in our public directory at /tools.