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Documentation Index

Fetch the complete documentation index at: https://docs.alterhq.com/llms.txt

Use this file to discover all available pages before exploring further.

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!"}]
)

​
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
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