Hello. For the last ~30 minutes requests to https://openrouter.ai/anthropic/claude-3.7-sonnet model return reasoning block as part of their responses. It happens across at least Google and core Anthropic providers, so unlikely to be provider side issue.
#Anthropic: Claude 3.7 Sonnet non-thinking endpoint returns reasoning
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That may happen if you're sending an optional reasoning parameter.
https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens
Or it still it still returning reasoning without it? Seems to work properly for me.