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[GH-ISSUE #15536] Can't disable thinking in any GUI, using Ollama 0.20.6 #71986

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opened 2026-05-05 03:15:10 -05:00 by GiteaMirror · 4 comments
GiteaMirror commented 2026-05-05 03:15:10 -05:00
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Originally created by @Nikorasu on GitHub (Apr 13, 2026).
Original GitHub issue: https://github.com/ollama/ollama/issues/15536

What is the issue?

Since I updated to 0.20.6, I haven't been able to use "/set nothink" in the terminal, or any GUI with the ability to disable thinking. The model just ignores those settings, and outputs "thinking" reasoning anyway.
Once I downgraded to 0.20.5, I can disable it fine again.

Originally created by @Nikorasu on GitHub (Apr 13, 2026). Original GitHub issue: https://github.com/ollama/ollama/issues/15536 ### What is the issue? Since I updated to 0.20.6, I haven't been able to use "/set nothink" in the terminal, or any GUI with the ability to disable thinking. The model just ignores those settings, and outputs "thinking" reasoning anyway. Once I downgraded to 0.20.5, I can disable it fine again.
GiteaMirror added the bug label 2026-05-05 03:15:10 -05:00
GiteaMirror commented 2026-05-05 03:15:14 -05:00
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@deezid commented on GitHub (Apr 13, 2026):

Same here, Gemma 4 became unusable with Ollama 0.20.6
Back to 0.20.5

<!-- gh-comment-id:4235398757 --> @deezid commented on GitHub (Apr 13, 2026): Same here, Gemma 4 became unusable with Ollama 0.20.6 Back to 0.20.5
GiteaMirror commented 2026-05-05 03:15:15 -05:00
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@rick-github commented on GitHub (Apr 13, 2026):

Prompt from 0.20.5:

ollama  | time=2026-04-13T10:56:41.441Z level=TRACE source=server.go:1551
  msg="completion request" prompt="<bos><|turn>user\nwhy is the sky blue?<turn|>\n<|turn>model\n"

Prompt from 0.20.6:

ollama  | time=2026-04-13T10:55:32.439Z level=TRACE source=server.go:1551
  msg="completion request" prompt="<bos><|turn>user\nwhy is the sky blue?<turn|>\n<|turn>model\n<|channel>thought\n<channel|>"

Probably https://github.com/ollama/ollama/pull/15490 @drifkin

<!-- gh-comment-id:4236081749 --> @rick-github commented on GitHub (Apr 13, 2026): Prompt from 0.20.5: ``` ollama | time=2026-04-13T10:56:41.441Z level=TRACE source=server.go:1551 msg="completion request" prompt="<bos><|turn>user\nwhy is the sky blue?<turn|>\n<|turn>model\n" ``` Prompt from 0.20.6: ``` ollama | time=2026-04-13T10:55:32.439Z level=TRACE source=server.go:1551 msg="completion request" prompt="<bos><|turn>user\nwhy is the sky blue?<turn|>\n<|turn>model\n<|channel>thought\n<channel|>" ``` Probably https://github.com/ollama/ollama/pull/15490 @drifkin
GiteaMirror commented 2026-05-05 03:15:15 -05:00
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@drifkin commented on GitHub (Apr 13, 2026):

@Nikorasu thanks for reporting, @rick-github thanks for the traces. Fixed in #15553, we'll get a release out soon

<!-- gh-comment-id:4238679632 --> @drifkin commented on GitHub (Apr 13, 2026): @Nikorasu thanks for reporting, @rick-github thanks for the traces. Fixed in #15553, we'll get a release out soon
GiteaMirror commented 2026-05-05 03:15:16 -05:00
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@drifkin commented on GitHub (Apr 13, 2026):

ah actually that fix is backwards. I think this is from a difference between the big- and small-model gemma4 templates, where the small ones don't like the empty thought channel. Investigating more.

<!-- gh-comment-id:4238939549 --> @drifkin commented on GitHub (Apr 13, 2026): ah actually that fix is backwards. I think this is from a difference between the big- and small-model gemma4 templates, where the small ones don't like the empty thought channel. Investigating more.
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