Claude Fable 5API
Frontier reasoning and long-horizon agents — the model Fable 5.1 succeeds.
Input price
$7.00
per 1M tokens
Output price
$35.00
per 1M tokens
Single upstreamServed through one supplier today. If that supplier has an outage, calls fail until it recovers — failed calls are never billed. We're adding a second supplier to every text model.
Prompt caching
Pass cache_control on a stable prefix and cache hits bill at a fraction of input. Cache writes bill at the vendor's write rate — 1.25× input on Claude and GPT-5.6+, the input rate elsewhere.
Auto-derived from input × 0.1
Specs
- Model ID
claude-fable-5- Endpoint
POST /v1/chat/completions- Category
- Text
- Provider
- Anthropic
- Context window (tokens)
- 1,000,000
- Max output (tokens)
- 128,000
- Capabilities
- VisionTool callingStreamingReasoningLong context
Drop-in OpenAI compatibility
Point your existing OpenAI SDK at api.kunavo.com/v1 and swap the model id. No streaming changes, no SDK changes.
View docsClaude Fable API guide (5.1 and 5.5)Try it
Set KUNAVO_API_KEY from /app/keys, then run any of the snippets below.
curl https://api.kunavo.com/v1/chat/completions \
-H "Authorization: Bearer $KUNAVO_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-fable-5",
"messages": [
{"role": "user", "content": "Hello, Claude Fable 5"}
],
"stream": false
}'Kunavo vs calling Anthropic directly
Same Claude Fable 5 weights, same responses. What a gateway changes is the account, the SDK and the bill — here is the honest side-by-side.
| Kunavo | Anthropic direct | |
|---|---|---|
| Price (per 1M tokens) | $7.00 / $35.00 (−30%) | $10.00 / $50.00 |
| Account | One Kunavo account, key in 2 minutes, $10 minimum top-up | A Anthropic account plus its own billing setup |
| SDK | Keep the OpenAI SDK — change base_url, set model to "claude-fable-5" | Anthropic's SDK, or their OpenAI-compatible layer where offered |
| Same key also reaches | Claude, GPT, image, video and audio models | Anthropic's own catalog only |
| Billing | One Stripe balance, pay-as-you-go, never expires; failed requests unbilled | A separate invoice per provider |
| Rate limits | Shared gateway capacity, no contractual per-account limit | Anthropic's own tier limits, raised by usage history or contract |
Go direct to Anthropic when you need a contractual rate limit, an enterprise SLA, or a provider-only feature on day one. Use Kunavo when you want one key, one balance and a lower per-token rate across every provider.
Frequently asked questions
How much does Claude Fable 5 cost?
On Kunavo, Claude Fable 5 is $7.00 per 1M input tokens and $35.00 per 1M output tokens — about 30% under Anthropic's official price. Failed requests are never billed, and you pay as you go only for successful calls.
Can I call Claude Fable 5 with the OpenAI SDK?
Yes. Set base_url to https://api.kunavo.com/v1, use your Kunavo key, and set model to "claude-fable-5". Requests and responses are OpenAI-compatible; Claude is also available on the native /v1/messages endpoint
What endpoint does Claude Fable 5 use?
Call Claude Fable 5 through POST /v1/chat/completions on Kunavo’s OpenAI-compatible API.
What is Claude Fable 5 good for?
Claude Fable 5 is a text model from Anthropic, with support for Vision, Tool calling, Streaming, Reasoning, and Long context.
What is different from calling Anthropic directly?
The model is the same — about 30% under Anthropic's official price. The surrounding setup changes: one key and one Stripe balance replace a Anthropic account and its billing, you can use the OpenAI SDK by changing base_url, and the same key also reaches Claude, GPT, image, video and audio models. Gateway capacity is shared. If your use case requires provider-negotiated limits for Claude Fable 5, contact Anthropic directly.
Is Claude Fable 5 cheaper on Kunavo?
Yes. Claude Fable 5 is about 30% below Anthropic’s official list price on Kunavo, with no subscription or monthly minimum. You pay for successful usage, starting with a $10 top-up; failed requests are never billed and your balance never expires.