New OpenAI GPT-5.1 (and 5.1 Codex) models #1300

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1. simonw

   added

   models

   openai

   on Nov 13, 2025
2. simonw commented on Nov 13, 2025

   

   simonw

   on Nov 13, 2025

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   diff --git a/llm/default_plugins/openai_models.py b/llm/default_plugins/openai_models.py
   index 94c1ffc..2c10877 100644
   --- a/llm/default_plugins/openai_models.py
   +++ b/llm/default_plugins/openai_models.py
   @@ -182,6 +182,30 @@ def register_models(register):
                    supports_tools=True,
                ),
            )
   +    # GPT-5.1
   +    for model_id in (
   +        "gpt-5.1",
   +        "gpt-5.1-chat-latest",
   +        "gpt-5.1-codex",
   +        "gpt-5.1-codex-mini",
   +    ):
   +        register(
   +            Chat(
   +                model_id,
   +                vision=True,
   +                reasoning=True,
   +                supports_schema=True,
   +                supports_tools=True,
   +            ),
   +            AsyncChat(
   +                model_id,
   +                vision=True,
   +                reasoning=True,
   +                supports_schema=True,
   +                supports_tools=True,
   +            ),
   +        )
   +
        # The -instruct completion model
        register(
            Completion("gpt-3.5-turbo-instruct", default_max_tokens=256),
3. simonw commented on Nov 13, 2025

   

   simonw

   on Nov 13, 2025

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   uv run llm -m gpt-5.1 -t pelican-svg
   uv run llm -m gpt-5.1-chat-latest -t pelican-svg
   uv run llm -m gpt-5.1-codex -t pelican-svg
   uv run llm -m gpt-5.1-codex-mini -t pelican-svg

   The first two worked: https://gist.github.com/simonw/fce773879bcd66e01df59a5011899532

   It looks like the codex models require the Responses API.
4. simonw commented on Nov 13, 2025

   

   simonw

   on Nov 13, 2025

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   Here's the GPT-5.1 pelican:

   

   And for gpt-5.1-chat-latest:

   
5. simonw

   added 2 commits that reference this issue on Nov 13, 2025

   GPT-5.1 models

   ...

   682046f

   gpt-5.1 and gpt-5.1-chat-latest, refs #1300

   0526abe
6. simonw commented on Nov 13, 2025

   

   simonw

   on Nov 13, 2025

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   Tried this instead:

   uv run llm -m gpt-5.1 -t pelican-svg -o reasoning_effort high

   https://gist.github.com/simonw/fd120c35d8d34512c6f15d8d8e5192ec

   
7. simonw commented on Nov 13, 2025

   

   simonw

   on Nov 13, 2025

   Last edited by simonw

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   Just spotted this in https://openai.com/index/gpt-5-1-for-developers/

   Developers can now use GPT‑5.1 without reasoning by setting reasoning_effort to 'none'.

   Need to add that to this enum:

   llm/llm/default_plugins/openai_models.py

   Lines 456 to 460 in 0526abe

   	class ReasoningEffortEnum(str, Enum):
   	minimal = "minimal"
   	low = "low"
   	medium = "medium"
   	high = "high"

   ... or maybe we don't need to change that, since the default for 5.1 is none if you don't specify one.
8. simonw commented on Nov 13, 2025

   

   simonw

   on Nov 13, 2025

   Last edited by simonw

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   Need to add support for extended prompt cache retention: https://platform.openai.com/docs/guides/prompt-caching#extended-prompt-cache-retention

   To use extended caching with GPT‑5.1, add the parameter "prompt_cache_retention='24h'" on the Responses or Chat Completions API. See the prompt caching docs⁠ for more detail.
9. liammonahan commented on Dec 10, 2025

   

   liammonahan

   on Dec 10, 2025

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   What's a good next step here? The 5.1 chat (non-codex) models seem to be in good shape. Maybe pushing a release with those could unblock users while continuing to work on the codex integration? Thanks for all your work on this library.
10. simonw

    added a commit that references this issue on Dec 12, 2025

    Release 0.28

    ...

    3a4f639