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

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Model Naming Format

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

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OpenAI Models

Model NameDescriptionContext Window
OpenAI#gpt-5Latest GPT-5 model128K
OpenAI#gpt-5-miniLightweight GPT-5128K
OpenAI#gpt-5-nanoFastest GPT-5 variant128K
OpenAI#o3Advanced reasoning200K
OpenAI#o4-miniEfficient reasoning200K

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Claude (Anthropic) Models

Model NameDescriptionContext Window
Claude#claude-sonnet-4-6Latest Claude Sonnet200K
Claude#claude-opus-4-6Most capable Claude200K
Claude#claude-haiku-4-6Fast Claude variant200K

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Gemini (Google) Models

Model NameDescriptionContext Window
Gemini#gemini-2.5-proMost capable Gemini1M
Gemini#gemini-2.5-flashFast Gemini1M
Gemini#gemini-2.5-flash-liteLightweight Gemini1M

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Mistral Models

Model NameDescriptionContext Window
Mistral#mistral-large-latestMost capable Mistral128K
Mistral#mistral-small-latestEfficient Mistral128K
Mistral#codestral-2501Code specialist32K
Mistral#pixtral-large-latestVision capable128K

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Perplexity Models

Model NameDescriptionContext Window
Perplexity#sonarWeb-aware model128K
Perplexity#sonar-proAdvanced web search128K
Perplexity#sonar-reasoningReasoning with web128K

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Alter Models

Model NameDescription
Alter#bestAutomatically selects best model
Alter#fairCost-effective option
Alter#lightFastest response

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Usage Examples

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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!"}]
)

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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!"}]
  }'

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Model Selection Tips

For Speed
  • Alter#light
  • OpenAI#gpt-5-nano
  • Gemini#gemini-2.5-flash-lite
For Quality
  • Alter#best
  • OpenAI#gpt-5
  • Claude#claude-opus-4-6
  • Gemini#gemini-2.5-pro
For Coding
  • OpenAI#gpt-5
  • Mistral#codestral-2501
  • Claude#claude-sonnet-4-6
For Vision
  • OpenAI#gpt-5
  • Gemini#gemini-2.5-pro
  • Mistral#pixtral-large-latest
For Cost
  • Alter#fair
  • Alter#light
  • OpenAI#gpt-5-nano