* {@code null} means use the model default, {@code 0} disables thinking.
     *
     * @return the thinking budget
     */
    public Integer getThinkingBudget() {
        return thinkingBudget;
    }

    /**
     * Sets the thinking budget for models that support thinking tokens.
     * {@code null} means use the model default, {@code 0} disables thinking.