Support o3-mini model

[Piotr1215]

With the release of o3-mini we need to add support for it similar to o1 models.

Crud implementation idea:

if provider == "openai" and (model.model:sub(1, 2) == "o1" or model.model == "o3-mini") then

In this line

[QuestionableAntics]

Being able to set the reasoning_effort property for reasoning models would also be nice.

[QuestionableAntics]

I created an MR to add o3 in

[ctrlplusb]

you can monkeypatch the fix that @Piotr1215 suggested via:

require('gp').setup { 
  -- your config
}

-- Monkey patch the dispatcher after setup
local dispatcher = require 'gp.dispatcher'
local original_prepare_payload = dispatcher.prepare_payload
dispatcher.prepare_payload = function(messages, model, provider)
  local output = original_prepare_payload(messages, model, provider)
  if provider == 'openai' and model.model:sub(1, 2) == 'o3' then
    for i = #messages, 1, -1 do
      if messages[i].role == 'system' then
        table.remove(messages, i)
      end
    end
    output.max_tokens = nil
    output.temperature = nil
    output.top_p = nil
    output.stream = true
  end
  return output
end