# Telnyx Codex API Evaluation

**Category:** Voice Telephony
**Score:** 51 (D)

This is the agent-readable Devtool Arena evaluation page for Telnyx on Codex API.

## Summary

| Metric | Value |
|--------|-------|
| Status | completed |
| Overall score | 51 |
| Grade | D |
| Eval score | 30 |
| Discovery score | 100 |
| Cost | $0.03 |
| Runtime | 1m 14s |
| Tool calls | 22 |
| Errors | 5 |
| Tokens used | 0 |
| Success | No |

## Agent-Readiness Checklist

| Signal | Evidence |
|--------|----------|
| Context7 | https://context7.com/team-telnyx/telnyx-node |
| llms.txt | https://telnyx.com/llms.txt |
| MCP server | https://telnyx.com/.well-known/mcp/server-card.json |
| Typed SDK | https://pypi.org/project/telnyx/ |
| OpenAPI | https://telnyx.com/openapi.json |
| Agent skills | https://telnyx.com/.well-known/agent-skills/index.json |
| CLI | https://github.com/team-telnyx/telnyx-cli |

## Evaluation Prompt

````text

# Task
Using https://developers.telnyx.com/docs/voice/programmable-voice/get-started, complete the following task:

Using the Telnyx Python SDK, build me a script that performs a voice telephony workflow:

1. Install the official Telnyx Python SDK (pip install)
2. Check the Telnyx documentation to determine the easiest programmable voice workflow
3. **Preferred:** Create a ***** outbound voice call to "+15551234567" using a valid sandbox/***** caller ID and print the API response as JSON.
   If the provider requires a public answer URL, callback URL, or hosted instructions, use a simple public example from the official docs.
4. **If outbound voice calls are not practical in ***** mode but telephony messaging is supported:** Send a ***** SMS message to "+15551234567" and print the API response as JSON.
5. Print the response fields that identify the call or message and its status

You MUST use the official Telnyx Python SDK — do not make raw HTTP/REST calls. 

## Execution
After creating the script, run it to verify it works:
```bash
cd /home/daytona/app && python <your_script>.py
```

The script should print output to stdout. If there are errors, debug and fix them until it runs successfully.

````

## Grader Results

| Check | Passed | Weight | Score | Details |
|-------|--------|--------|-------|---------|
| Cost | Yes | 0 | 1 | $0.03 (<$0.10, excellent) |
| Time | Yes | 0 | 1 | 74s (1–2min, great) |
| Efficiency | Yes | 0 | 0 | 22 tool calls (≤25, below average) |
| Found Docs | Yes | 0 | — | Touched docs at developers.telnyx.com: yes (16 matching tool calls) |
| Zero Errors | No | 0 | — | Tool outputs with errors/tracebacks: 5 |
| Syntax Valid | No | 0 | — | Syntax errors present |
| Created Files | No | 0 | — | Generated files: 0 (need ≥1) |
| Full Execution | No | 0 | — | Method: failed, Exit: 1 |

## Run Artifacts

| Artifact | Value |
|----------|-------|
| Conversation turns | 25 |
| Tool call traces | 22 |
| Generated files | 0 |
| Exit code | 1 |
| Completed at | 2026-09-27T02:09:52.765038+00:00 |

## Related Pages

- [Codex API leaderboard](/leaderboard/codex/api)
- [Compare Codex API companies](/leaderboard/codex/api/compare)
- [Agent Landscape](/leaderboard/discoverability)

Canonical URL: https://devtoolarena.com/codex/api/telnyx