Claude API - Access Anthropic Claude Models via AIsa - AIsa

AIsa gives you access to Anthropic’s Claude models with one AIsa API key, the same prepaid balance, and the same usage logs as your other models. Claude models use the Anthropic-compatible POST /v1/messages endpoint, so the Anthropic SDK works after you change its base URL.

Supported Claude models

Model ID	Type	Endpoints
`claude-fable-5`	Text	`/v1/messages`
`claude-fable-5-1`	Text	`/v1/messages`
`claude-haiku-4-5-20251001`	Text	`/v1/messages`
`claude-haiku-5-5`	Text	`/v1/messages`
`claude-opus-4-5-20251101`	Text	`/v1/messages`
`claude-opus-4-6`	Text	`/v1/messages`
`claude-opus-4-7`	Text	`/v1/messages`
`claude-opus-4-8`	Text	`/v1/messages`
`claude-opus-5`	Text	`/v1/messages`
`claude-opus-5-5`	Text	`/v1/messages`
`claude-sonnet-4-5-20250929`	Text	`/v1/messages`
`claude-sonnet-4-6`	Text	`/v1/messages`
`claude-sonnet-5`	Text	`/v1/messages`
`claude-sonnet-5-5`	Text	`/v1/chat/completions`, `/v1/messages`, `/v1/responses`

Current prices for these models are on aisa.one/models.

Quickstart

The Anthropic SDK appends /v1/messages itself, so the base URL has no /v1.

import anthropic

client = anthropic.Anthropic(api_key="YOUR_AISA_API_KEY", base_url="https://api.aisa.one")

message = client.messages.create(
    model="claude-sonnet-5-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Review this pull request for security and correctness."}],
)
print("".join(block.text for block in message.content if block.type == "text"))

To run Claude Code on AIsa, see Use AIsa in Claude.

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