AI21 Labs vs Arena
AI21 Labs vs Arena, compared side by side on 22 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: AI21 Labs is on 71/100 and Arena on 63/100.
Where each one leads
AI21 Labs
- our overall score: 71/100 against 63/100
- agent readiness: 50/100 against 41/100
- funding raised: $327M against $250M
Arena
Leads on none of the measures we hold for both companies.
At a glance
| Measure | AI21 Labs | Arena |
|---|---|---|
| What it is | Enterprise large language models and developer platform for custom AI applications. | The de facto public leaderboard for frontier LLMs. |
| Category | Foundation Model, Large Language Model, Generative AI, API Platform | Artificial Intelligence, Machine Learning, Large Language Models, Data Analytics |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Platform |
| Founded | 2017 | 2023 |
| Headquarters | Tel Aviv, Israel | Berkeley, USA |
| Status | Active | Active |
Size, funding and growth
| Measure | AI21 Labs | Arena |
|---|---|---|
| Employees | 221 | Not published |
| Headcount growthLast 12 months | +32.0% | Not published |
| Total funding | $327M | $250M |
| Latest round | Series C | Series A |
| Valuation | $1.4B | $1.7B |
| LinkedIn followers | 35,891 | Not published |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | AI21 Labs | Arena |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 71/100 | 63/100 |
| Traction | 60/100 | 40/100 |
| Team | 100/100 | 60/100 |
| Community | 8/100 | 8/100 |
| Search visibility | 40/100 | 38/100 |
| Quality | 76/100 | 78/100 |
| Agent readinessHow well an AI agent can read and act on the site | D (50/100) | D (41/100) |
| Domain ratingLink authority, 0-100 | 75/100 | 78/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | AI21 Labs | Arena |
|---|---|---|
| Hosting | Not detected | Vercel |
| CDN | Cloudflare | Vercel |
| CMS | WordPress | Framer |
| Frameworks | Jquery | Next.js |
| Analytics | Google Analytics 4, Google Tag Manager, Amplitude | Not detected |
| Support stack | HubSpot | Not detected |
| Open source | No | Yes |
AI21 Labs vs Arena: common questions
Which is better, AI21 Labs or Arena?
On our 0-100 score AI21 Labs rates higher (71/100 against 63/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 22 data points above: read the rows that match what you are buying for.
How do AI21 Labs and Arena compare on the numbers?
AI21 Labs leads on our overall score (71/100 against 63/100), agent readiness (50/100 against 41/100), funding raised ($327M against $250M).
Read the full AI21 Labs review and pricing or the Arena review and pricing. You can also browse other AI21 Labs alternatives we track.