Comparison · Coding
OpenAI Codex vs Tessl: which AI agent is better?
A side-by-side look at OpenAI Codex and Tessl on quality, price, capabilities and trust. Scores measure observable public data; prices come from each vendor's own pricing page. Every fact is sourced and dated.
| OpenAI Codex OpenAI | Tessl Tessl AI Ltd | |
|---|---|---|
| Agent Score | 49 | 45 |
| Entry price | $8/mo · free plan | $100/mo · free plan |
| Trust | ✓ VERIFIED | ✓ VERIFIED |
| Capabilities documented | 3 | 6 |
| Free plan | ✓ Yes | ✓ Yes |
| Free trial | — | — |
| Public API | ✓ Yes | — |
| MCP support | — | — |
| Open source | ✓ Yes | — |
| Last verified | 24 Oct 2026 | 25 Oct 2026 |
Score breakdown
| Component | OpenAI Codex | Tessl |
|---|---|---|
| Capabilities | 38 | 50 |
| Integrations | 25 | Not measured |
| Documentation | Not measured | Not measured |
| Pricing clarity | 100 | 100 |
| Transparency | 100 | 70 |
| Freshness | 100 | 100 |
| Human oversight | Not measured | Not measured |
Choose OpenAI Codex if…
- You want a higher Agent Score (49 vs 45).
- You want an open-source option.
- You want a public API.
Choose Tessl if…
- You want more documented capabilities (6 vs 3).
See the full picture: OpenAI Codex · Tessl · more Coding agents · all comparisons.