Sonnet 5 timing out
complete
M
Modern Marmoset
Subject: Claude Sonnet 5 (via OpenRouter) hangs and times out on longer prompts
Hi Novelcrafter team,
I'm running into an issue using Anthropic's new Claude Sonnet 5 model (anthropic/claude-sonnet-5 on OpenRouter) inside Novelcrafter.
What's happening:
* Simple/short prompts work fine and return output normally.
* Longer or more complex prompts (e.g. actual writing prompts) get stuck on the thinking dots and eventually time out with no output.
* I've confirmed this isn't an OpenRouter credits/billing issue — my account is funded and other models work fine.
* Switching the same prompt to Claude Sonnet 4.5 works without any issue.
My guess (happy to be corrected): Sonnet 5 now defaults to "adaptive thinking" at a higher reasoning effort level than previous Sonnet versions, so it spends more time reasoning before producing visible output. If Novelcrafter isn't streaming/displaying that reasoning phase for this model, or the request timeout isn't accounting for it, longer prompts may be exceeding the timeout before any content comes back.
Could you take a look at:
- Whether Sonnet 5's reasoning/thinking phase is being handled the same way as other reasoning models in Novelcrafter
- Whether there's a way to lower the reasoning effort for this model, or extend the timeout for it
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spaceemotion
updated the status to
complete
There's currently no way to toggle off the reasoning of Sonnet 5 - but our testing also showed that, if you do, it becomes a very bad performing model.
You can set the reasoning levels (low, medium, high) in the model settings after enabling the "reasoning" experiment from the application settings (reachable via the profile menu). See https://www.novelcrafter.com/help/docs/models/thinking-settings for more information.
Bear in mind, that even on a low setting, Sonnet 5 can take up to 2-3 minutes to respond in some cases. It will take its time, if you have more complex tasks (for general writing, it should not time out as much).