Ollama fails to return valid structured output

LLM apps3 posts from 2 people2d active+22 posts in the last 7 days, 0 the 7 days before (rising)

Posts per day3 posts, Sep 6 to Oct 5

The posts behind it

3, newest first

Post	Where	Date
Gemma4: JSON schema format is not enforced when think:true answers directly without reasoning...\| 3/3 schema-valid \| All 12 requests returned HTTP 200 with `done_reason:"stop"`. The failing `think:true` responses completed after 4 evaluated tokens, so the failure is not caused by reaching `num_predict`. ### Expected behavior When a JSON schema is supplied through `format`,...ollama/ollamaLixinDu	ollama/ollamaLixinDu	Oct 32 days ago
/api/generate accepts trailing non-JSON data after a valid JSON request body### What is the issue? ### Summary On Ollama 0.35.1, `POST /api/generate` accepts a complete JSON request object followed by non-JSON data. The request uses `Content-Type: application/json`, but the complete request body is not a valid JSON document. For example, appending:...ollama/ollamaLixinDu	ollama/ollamaLixinDu2 replies	Oct 32 days ago
Ollama: think=False is coerced to None (falls back to self.thinking) in chat/stream_chat/achat/astream_chat...4) gets the instance default instead - the opposite of what was asked - and there is no way to disable thinking per call when `self.thinking` is truthy or `None` (Ollama then decides for itself). Expected: The fix is four lines, one per method. With it the request body carries...run-llama/llama_indexrich12312	run-llama/llama_indexrich123122 replies	Sep 64 weeks ago

Companies and products named

Company or product	Posts naming it
Ollama	3
GitHub	2
LlamaIndex	1

About this problem

Evidence

3 posts from 2 people in 2 places, about 1 a week over 28 days. Mostly on ollama/ollama, run-llama/llama_index. Tools named alongside: GitHub, LlamaIndex.

Frustration Frustration 2 of 3· Seen on GitHub issues

How it was grouped

Posts that state a pain and match the "structured-output" rule about Ollama. First post Sep 6, 2026, latest Oct 3, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method

The same problem elsewhere

Posts per day

The posts behind it

Companies and products named

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