Claude Fable 5
claude-fable-5
These are Mengbi Router customer prices in USD per 1M tokens. Provider: Anthropic; Context: 1M; Input price: $4.29; Output price: $21.43.
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Model specs
- Provider
- Anthropic
- Context
- 1M
- Max output
- 64K
- Released
- Jun 2026
- Input modalities
- Text, Image, PDF
- Output modalities
- Text
- Tool calling
- Supported
- Structured output
- Supported
- Currency
- USD
- Model ID
- claude-fable-5
Model pricing and access details
USD / 1M tokens| Model | Official | Mengbi | Discount |
|---|---|---|---|
| Input price | $10 | $4.29 | 57% OFF |
| Output price | $50 | $21.43 | 57% OFF |
| Cache read price | $1 | $0.429 | 57% OFF |
Estimated cost for common usage
Estimates based on current Mengbi Router prices, so you can plan real request costs.
| Token volume | Input | Output | Input + output total |
|---|---|---|---|
| 10K tokens | $0.0429 | $0.214 | $0.257 |
| 100K tokens | $0.429 | $2.14 | $2.57 |
| 1M tokens | $4.29 | $21.43 | $25.71 |
| 10M tokens | $42.86 | $214.29 | $257.14 |
Estimates use the current prices above and exclude cache-hit discounts. Your invoice is metered by the actual token usage of each request.
Public benchmark scores
How Claude Fable 5 scores on common public benchmarks, so you can compare capability at a glance.
| Benchmark | Score |
|---|---|
| GPQA Diamond | 93.5 |
| SWE-bench Verified | 79.8 |
| AIME 2026 | 93.9 |
Curated from vendor-published evaluations (snapshot 2026-09). For reference only; not independently tested by Mengbi.
API protocol compatibility
Keep your SDK. Change one line.
Use the protocol your stack already speaks.
const client = new OpenAI({
apiKey: process.env.MENGBI_ROUTER_KEY,
baseURL: process.env.MENGBI_ROUTER_BASE_URL,
})
const response = await client.chat.completions.create({
model: 'claude-fable-5',
messages,
})Frequently asked questions
Common questions about the Claude Fable 5 API: pricing, capabilities, and integration.
How much does the Claude Fable 5 API cost?
Through Mengbi Router, Claude Fable 5 costs $4.29 per 1M input tokens and $21.43 per 1M output tokens. Cached input is billed at $0.429 per 1M tokens.
What is the context window of Claude Fable 5?
Claude Fable 5 supports a 1M-token context window. A single request can generate up to about 64K output tokens.
Does Claude Fable 5 support tool calling and structured output?
Yes. Claude Fable 5 supports the tools parameter in chat.completions for function calling. It also supports response_format with a JSON Schema for structured output.
What input and output formats does Claude Fable 5 support?
It accepts Text, Image, and PDF and returns Text.
How do I call Claude Fable 5 with the OpenAI SDK?
Keep your OpenAI SDK, point the base URL at Mengbi Router, use your Mengbi API key, and set model to claude-fable-5 in the request.
Which company provides Claude Fable 5?
Claude Fable 5 is provided by Anthropic and available through Mengbi Router with one API key and pay-as-you-go billing. The model was first released in Jun 2026.