Gemini Compatible API

AnyInt exposes Gemini-compatible routes under the /gemini/v1beta prefix. Treat these as provider-native routes and validate them in your environment before production use.

AnyInt exposes Gemini-compatible routes under the /gemini/v1beta prefix. These routes use Gemini-native contents[].parts[] request bodies rather than OpenAI messages.

Published routes

Route	Use case
`POST /gemini/v1beta/models/{model}:generateContent`	Text generation and native function calling
`POST /gemini/v1beta/models/{model}:streamGenerateContent?alt=sse`	Streaming generation
`POST /gemini/v1beta/models/{image_model}:generateContent`	Text-plus-image output

Authentication

Authorization: Bearer <ANYINT_API_KEY>

When to use Gemini-compatible routes

You want to keep Gemini-native contents[].parts[] payloads
You need streamGenerateContent?alt=sse
You want Gemini-native tools.functionDeclarations
You want the published Gemini image-generation route instead of a generic chat wrapper

If you want one uniform SDK integration, start with the OpenAI Compatible API instead.

Text generation example

Request fields

Field	Type	Required	Meaning	Example
`contents`	array	Yes	Conversation turns in Gemini-native format.	`[{"role":"user","parts":[...]}]`
`contents[].role`	string	Recommended	Message role. Use `user` for user prompts and `model` for prior model turns.	`user`
`contents[].parts`	array	Yes	Content parts for the turn.	`[{"text":"Hello"}]`
`parts[].text`	string	For text input	Text prompt content.	`Explain AnyInt.`
`parts[].inlineData`	object	For inline media	Inline media payload when supported by the model.	`{"mimeType":"image/png","data":"..."}`
`tools`	array	No	Gemini-native tool declarations.	`[{"functionDeclarations":[...]}]`
`generationConfig`	object	No	Generation controls such as temperature, max output tokens, or image response modalities.	`{"temperature":0.7}`
`safetySettings`	array	No	Gemini-compatible safety settings when supported by the selected model.	`[{"category":"...","threshold":"..."}]`

Generation config fields

Field	Type	Required	Meaning	Example
`temperature`	number	No	Sampling randomness.	`0.7`
`topP`	number	No	Nucleus sampling value.	`1`
`topK`	integer	No	Limits sampling to top K tokens when supported.	`40`
`maxOutputTokens`	integer	No	Maximum generated tokens.	`512`
`stopSequences`	array	No	Stop sequences that end generation.	`["END"]`
`responseModalities`	array	Image generation only	Required for Gemini image output examples; include `TEXT` and `IMAGE`.	`["TEXT","IMAGE"]`

curl https://gateway.api.anyint.ai/gemini/v1beta/models/gemini-3-flash-preview:generateContent \
  -H "Authorization: Bearer $ANYINT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {"text": "How does AnyInt help multi-provider teams?"}
        ]
      }
    ]
  }'

The minimum published request body is contents with at least one content item and one text part.

Streaming example

curl "https://gateway.api.anyint.ai/gemini/v1beta/models/gemini-3-flash-preview:streamGenerateContent?alt=sse" \
  -H "Authorization: Bearer $ANYINT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {"text": "Stream a short answer about API gateways."}
        ]
      }
    ]
  }'

The alt=sse query parameter is required on the published streaming route.

Streaming response behavior

Field	Meaning
`candidates[]`	Incremental candidate outputs from the model
`candidates[].content.parts[]`	Generated text or media parts, depending on the model
`usageMetadata`	Token usage metadata when returned by the provider
`finishReason`	Why generation stopped for the candidate

Function-calling example

Function declaration fields

Field	Type	Required	Meaning	Example
`tools[].functionDeclarations`	array	Yes	Functions the model may call.	`[{"name":"get_weather",...}]`
`name`	string	Yes	Function name your application recognizes.	`get_current_temperature`
`description`	string	Recommended	Tells the model when to use the function.	`Gets the current temperature.`
`parameters`	object	Yes	JSON-schema-like parameter description.	`{"type":"object","properties":{...}}`
`parameters.properties`	object	Usually	Function argument fields.	`{"location":{"type":"string"}}`
`parameters.required`	array	No	Required argument names.	`["location"]`

curl https://gateway.api.anyint.ai/gemini/v1beta/models/gemini-3-flash-preview:generateContent \
  -H "Authorization: Bearer $ANYINT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {"text": "What is the temperature in London?"}
        ]
      }
    ],
    "tools": [
      {
        "functionDeclarations": [
          {
            "name": "get_current_temperature",
            "description": "Gets the current temperature for a given location.",
            "parameters": {
              "type": "object",
              "properties": {
                "location": {
                  "type": "string",
                  "description": "The city name, e.g. San Francisco"
                }
              },
              "required": ["location"]
            }
          }
        ]
      }
    ]
  }'

This is the published Gemini-native tool pattern. It is the right choice when you want the model to emit function arguments using functionDeclarations rather than OpenAI-style tools.

Image generation example

The published image-generation schema requires generationConfig.responseModalities to include both TEXT and IMAGE.

curl https://gateway.api.anyint.ai/gemini/v1beta/models/gemini-3.1-flash-image-preview:generateContent \
  -H "Authorization: Bearer $ANYINT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {"text": "Generate a cinematic poster for an AI music launch."}
        ]
      }
    ],
    "generationConfig": {
      "responseModalities": ["TEXT", "IMAGE"]
    }
  }'

Common mistakes

Forgetting alt=sse on the streaming route
Omitting role: "user" in contents[]
Calling bare /v1beta/... instead of the AnyInt /gemini/v1beta/... prefix
Omitting responseModalities on image generation
Sending OpenAI messages instead of Gemini contents[].parts[]

Gemini Compatible API

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