Fix OpenRouter reasoning instruction role#5221
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badlogic merged 2 commits intoMay 31, 2026
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Summary
OpenRouter reasoning requests now use
systemmessages for system prompts by default instead ofdevelopermessages. OpenAI reasoning models keep the existingdeveloperbehavior.Why
OpenRouter docs describe the Chat Completions request schema with
system,user,assistant, andtoolroles, while its OpenAPI spec also includesdeveloper, so role support is not consistently documented across surfaces:ChatDeveloperMessage: https://openrouter.ai/openapi.jsonreasoningparameter but do not requiredevelopermessages: https://openrouter.ai/docs/guides/best-practices/reasoning-tokens.mdSome routed providers behind OpenRouter reject
developermessages for reasoning requests. Usingsystemis the safer common denominator for OpenRouter chat completions while retainingdeveloperfor OpenAI reasoning models.Fixes #5117 #5229