Fix ElevenLabs API error

[rudransh-shrivastava]

Proposed change

Resolves #3859

I've used the default Liam voice but more voices can be found here: https://elevenlabs.io/app/default-voices

Note: I am not able to generate a video due to these issues:

elevenlabs.core.api_error.ApiError: headers: {'date': 'Sun, 08 Feb 2026 19:09:06 GMT', 'server': 'uvicorn', 'content-length': '476', 'content-type': 'application/json', 'access-control-allow-origin': '*', 'access-control-allow-headers': '*', 'access-control-allow-methods': 'POST, PATCH, OPTIONS, DELETE, GET, PUT', 'access-control-max-age': '600', 'strict-transport-security': 'max-age=1800;', 'x-trace-id': '19159a1aae275c7d79add6949342770a', 'x-region': 'asia-southeast1', 'via': '1.1 google', 'alt-svc': 'h3=":443"; ma=2592000,h3-29=":443"; ma=2592000'}, status_code: 401, body: {'detail': {'status': 'detected_unusual_activity', 'message': 'Unusual activity detected. Free Tier usage disabled. If you are using a proxy/VPN you might need to purchase a Paid Plan to not trigger our abuse detectors. Free Tier only works if users do not abuse it, for example by creating multiple free accounts. If we notice that many people try to abuse it, we will need to reconsider Free Tier altogether. \nPlease play fair and purchase any Paid Subscription to continue.'}}

Checklist

• Required: I followed the contributing workflow
• Required: I verified that my code works as intended and resolves the issue as described
• Required: I ran make check-test locally: all warnings addressed, tests passed
• I used AI for code, documentation, tests, or communication related to this PR

[coderabbitai]

Summary by CodeRabbit

• Changes
  • Updated default text-to-speech voice settings, including voice selection and speech speed adjustments to provide different audio output characteristics.

Walkthrough

Default ElevenLabs configuration defaults were changed: speed from 1.0 to 0.85 and voice_id from "1SM7GgM6IMuvQlz2BwM3" to "TX3LPaxmHKxFdv7VOQHJ". Corresponding test constants and the docstring were updated to match.

Changes

Cohort / File(s)	Summary
ElevenLabs Configuration backend/apps/common/eleven_labs.py	Updated __init__ defaults: speed changed from 1.0 to 0.85; voice_id changed from "1SM7GgM6IMuvQlz2BwM3" to "TX3LPaxmHKxFdv7VOQHJ". Docstring adjusted to reflect the new defaults and remove the previous default-speed note.
Test Constants backend/tests/apps/common/eleven_labs_test.py	Updated module-level test constants: DEFAULT_SPEED from 1.0 to 0.85; DEFAULT_VOICE_ID from "1SM7GgM6IMuvQlz2BwM3" to "TX3LPaxmHKxFdv7VOQHJ".

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	Title is vague and generic, using 'Fix' without clearly specifying which voice was changed or that it's an ElevenLabs voice selection update.	Consider a more descriptive title like 'Switch ElevenLabs voice to free-tier compatible option' to clarify the main change.
Out of Scope Changes check	❓ Inconclusive	The speed parameter change from 1.0 to 0.85 is not mentioned in issue #3859 requirements and may constitute an unrelated modification.	Clarify whether the speed adjustment was necessary for the voice change or if it should be separated into a distinct PR for better change isolation.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	Description clearly relates to the changeset, referencing issue #3859, explaining the voice change to Liam, and documenting the ElevenLabs API error encountered.
Linked Issues check	✅ Passed	PR successfully addresses issue #3859 by switching to a free-tier compatible voice (Liam) instead of the paid library voice that was causing the payment_required error.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

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• Post copyable unit tests in a comment

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[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

[coderabbitai]

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

backend/apps/common/eleven_labs.py (1)

109-121: ⚠️ Potential issue | 🟡 Minor

Stale default value in set_speed docstring.

Line 113 still documents default 1.0, but the constructor default is now 0.75.

Proposed fix

-            speed (float): Speech speed (0.25-4.0, default 1.0).
+            speed (float): Speech speed (0.25-4.0, default 0.75).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.68%. Comparing base (1e1da21) to head (6238718).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3861   +/-   ##
=======================================
  Coverage   93.68%   93.68%           
=======================================
  Files         463      463           
  Lines       14420    14420           
  Branches     1939     1939           
=======================================
  Hits        13509    13509           
  Misses        535      535           
  Partials      376      376           

Flag	Coverage Δ
backend	95.65% <ø> (ø)
frontend	88.17% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
backend/apps/common/eleven_labs.py	100.00% <ø> (ø)

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[arkid15r]

Worked good enough 👍
Thank you!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coderabbitai]

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

backend/apps/common/eleven_labs.py (1)

113-113: ⚠️ Potential issue | 🟡 Minor

Stale default value in set_speed docstring.

The docstring still references default 1.0, but the constructor default is now 0.85.

Proposed fix

-            speed (float): Speech speed (0.25-4.0, default 1.0).
+            speed (float): Speech speed (0.25-4.0, default 0.85).