provider.only

Assess

Techniques

A routing option that forces OpenRouter to use a specified provider only.

Why it's here

Placed in Assess: 1 article(s) of evidence from 1 source(s), led by framework updates, with 0 in the last 30 days. Confidence 24%. Low accumulated evidence, so it defaults conservatively pending more signal.

Evidence (1)

5Simon Willison·9/11/2026framework_update
OpenRouter routing can change model behavior
OpenRouter advertises automatic fallback routing and cost optimization across model providers, but different providers may run the same model with different serving software, settings, and capabilities. The article notes this can lead to inconsistent outputs, missing vision support, or different handling of reasoning options, and that users can restrict routing with the provider.only option.