See camelCase as PascalCase on open API generation

config.json

{
    "packageName":  "My.Sample.Project",
    "packageVersion":  "0.0.1",
    "useDateTimeOffset": true,
    "useCollection" : false,
    "returnICollection" : false
}

model.mustache

{{>partial_header}}
using System;
using System.Linq;
using System.IO;
using System.Text;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel.DataAnnotations;
using System.Runtime.Serialization;
using Newtonsoft.Json;

{{#models}}
{{#model}}
namespace {{packageName}}.Models
{ {{#isEnum}}{{>enumClass}}{{/isEnum}}{{^isEnum}}
    /// <summary>
    /// {{description}}
    /// </summary>
    [DataContract]
    public partial class {{classname}} : {{#parent}}{{{parent}}}, {{/parent}}IEquatable<{{classname}}>
    { {{#vars}}{{#isEnum}}{{>enumClass}}{{/isEnum}}{{#items.isEnum}}{{#items}}{{>enumClass}}{{/items}}{{/items.isEnum}}
        /// <summary>
        /// {{^description}}Gets or Sets {{{name}}}{{/description}}{{#description}}{{description}}{{/description}}
        /// </summary>
        {{#description}}
        /// <value>{{description}}</value>
        {{/description}}
        {{#required}}
        [Required]
        {{/required}}
        [DataMember(Name="{{baseName}}")]
        {{#isEnum}}
        public {{{datatypeWithEnum}}}{{#isEnum}}{{^isContainer}}?{{/isContainer}}{{/isEnum}} {{name}} { get; set; }
        {{/isEnum}}
        {{^isEnum}}
        public {{{dataType}}} {{nameInCamelCase}} { get; set; }
        {{/isEnum}}
        {{#hasMore}}
        {{/hasMore}}
        {{/vars}}
    }
{{/isEnum}}
{{/model}}
{{/models}}
}

openapi.json

{
  "openapi" : "3.0.1",
  "info" : {
    "title" : "Sample API",
    "description" : "Description for sample API.",
    "version" : "0.0.1",
    "x-audience" : "company-internal"
  },
  "servers" : [ {
    "url" : "http://localhost:8080/api"
  } ],
  "paths" : {
    "/my/sample/call" : {
      "get" : {
        "summary" : "Sample summary.",
        "responses" : {
          "200" : {
            "description" : "My sample description.",
            "content" : {
              "application/json" : {
                "schema" : {
                  "$ref" : "#/components/schemas/MySampleObject"
                }
              }
            }
          }
        }
      }
    }
  },
  "components" : {
    "schemas" : {
      "MySampleObject" : {
        "properties" : {
          "myVariableName" : {
            "type" : "string"
          }
        },
        "description" : "My sample object",
        "example" : {
          "myVariableName" : "myVariableName"
        }
      }
    }
  }
}