API Model Reference

This reference lists AI models available through the Alter API Router. Use these model names when making API requests.

Model lists change frequently. New models ship with each beta. This page is a snapshot — verify live availability in Settings → Router or your API client’s model picker. Names follow Provider#Model-name (for example OpenAI#gpt-5).

Model Naming Format

All models follow the format: Provider#Model-name For example: OpenAI#gpt-5, Claude#claude-sonnet-4-6

OpenAI Models

Model Name	Description	Context Window
`OpenAI#gpt-5`	Latest GPT-5 model	128K
`OpenAI#gpt-5-mini`	Lightweight GPT-5	128K
`OpenAI#gpt-5-nano`	Fastest GPT-5 variant	128K
`OpenAI#o3`	Advanced reasoning	200K
`OpenAI#o4-mini`	Efficient reasoning	200K

Claude (Anthropic) Models

Model Name	Description	Context Window
`Claude#claude-sonnet-4-6`	Latest Claude Sonnet	200K
`Claude#claude-opus-4-6`	Most capable Claude	200K
`Claude#claude-haiku-4-6`	Fast Claude variant	200K

Gemini (Google) Models

Model Name	Description	Context Window
`Gemini#gemini-2.5-pro`	Most capable Gemini	1M
`Gemini#gemini-2.5-flash`	Fast Gemini	1M
`Gemini#gemini-2.5-flash-lite`	Lightweight Gemini	1M

Mistral Models

Model Name	Description	Context Window
`Mistral#mistral-large-latest`	Most capable Mistral	128K
`Mistral#mistral-small-latest`	Efficient Mistral	128K
`Mistral#codestral-2501`	Code specialist	32K
`Mistral#pixtral-large-latest`	Vision capable	128K

Perplexity Models

Model Name	Description	Context Window
`Perplexity#sonar`	Web-aware model	128K
`Perplexity#sonar-pro`	Advanced web search	128K
`Perplexity#sonar-reasoning`	Reasoning with web	128K

Recent additions (beta71–beta100)

These models were added in recent betas. Availability may vary by plan and region.

Model Name	Added	Notes
`GLM#glm-5.2`	beta100	Zhipu GLM 5.2
`Deepseek#deepseek-v4-flash`	beta100	Fast Deepseek V4
`Deepseek#deepseek-v4-pro`	beta100	Full Deepseek V4
`Minimax#minimax-m3`	beta100	Minimax M3
`Cerebras#gemma-4-31b`	beta100	Cerebras-hosted Gemma 4 31B
`GLM#glm-5.1`	beta80–82	Prior GLM release
`Minimax#minimax-2.7`	beta80–82	Minimax 2.7
`Qwen#qwen-3.6-plus`	beta80–82	Qwen 3.6 Plus
`Cerebras#zai-glm-4.7`	beta63+	High-speed Cerebras inference

Exact provider prefixes and slug spelling match the Alter router catalog. If a name fails, check Settings → Router for the current string or use Alter#best for automatic selection.

Alter Models

Model Name	Description
`Alter#best`	Automatically selects best model
`Alter#fair`	Cost-effective option
`Alter#light`	Fastest response

Usage Examples

Python

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://alterhq.com/api/v1"
)

# Use GPT-5
response = client.chat.completions.create(
    model="OpenAI#gpt-5",
    messages=[{"role": "user", "content": "Hello!"}]
)

cURL

curl https://alterhq.com/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "OpenAI#gpt-5",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Model Selection Tips

For Speed

Alter#light
OpenAI#gpt-5-nano
Gemini#gemini-2.5-flash-lite
Cerebras#gemma-4-31b

For Quality

Alter#best
OpenAI#gpt-5
Claude#claude-opus-4-6
Gemini#gemini-2.5-pro
Deepseek#deepseek-v4-pro

For Coding

OpenAI#gpt-5
Mistral#codestral-2501
Claude#claude-sonnet-4-6
GLM#glm-5.2

For Vision

OpenAI#gpt-5
Gemini#gemini-2.5-pro
Mistral#pixtral-large-latest

For Cost

Alter#fair
Alter#light
OpenAI#gpt-5-nano
Deepseek#deepseek-v4-flash

Getting Started

Gateway & Router

App Integrations

Reference

API Reference

Model Naming Format

OpenAI Models

Claude (Anthropic) Models

Gemini (Google) Models

Mistral Models

Perplexity Models

Recent additions (beta71–beta100)

Alter Models

Usage Examples

Python

cURL

Model Selection Tips

​Model Naming Format

​OpenAI Models

​Claude (Anthropic) Models

​Gemini (Google) Models

​Mistral Models

​Perplexity Models

​Recent additions (beta71–beta100)

​Alter Models

​Usage Examples

​Python

​cURL

​Model Selection Tips

​Related

Model Naming Format

OpenAI Models

Claude (Anthropic) Models

Gemini (Google) Models

Mistral Models

Perplexity Models

Recent additions (beta71–beta100)

Alter Models

Usage Examples

Python

cURL

Model Selection Tips

Related