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Cerebras · Endpoint removal

disable_reasoning on POST /v1/chat/completions stops working

Stopped working July 21, 2026

Calls to POST /v1/chat/completions, body parameter disable_reasoning on Cerebras stopped working on July 21, 2026.

What to use instead of these calls

Use reasoning_effort="none" to disable reasoning.

Calls it hits

POST /v1/chat/completions
body parameter disable_reasoning

Facts

API: Cerebras api.cerebras.ai
Kind: Endpoint removal
Announced: March 24, 2026
Takes effect: July 21, 2026
Calls after that day: Fail
Source: Announcement
Last updated: October 17, 2026

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