claude-fable-5.1Anthropic
- endpoints
- 3
- regions
- 2
- api
- chat
- released
- September 2026
- eu routing
- available
capabilities 7/8
| # | flags | ||||||
|---|---|---|---|---|---|---|---|
| 1 |  Anthropic PBC | Global | 1M | $10.00 | $50.00 | $0.25 | no-train |
| 2 |  Google LLC (Vertex AI) | Global | 1M | $10.00 | $50.00 | $0.25 | no-train |
| 3 | Google LLC (Vertex AI) | eu | 1M | $11.00 | $55.00 | $0.28 | no-train |
no measured traffic for this model yet. the endpoints table above carries provider pricing
| eval | Score as a share of 100 | /100 |
|---|---|---|
| GPQA Diamond | 93.7 | |
| Coding Index | 81.6 | |
| SciCode | 63.1 | |
| Humanity's Last Exam | 59.1 | |
| Intelligence Index | 53.4 | |
| 5 evals | mean | 70.2 |
Scores from Artificial Analysis and public leaderboards, normalised to 100. Bar colour is the band, not the rank: green 80 and up, blue 55 and up, amber 30 and up. Benchmarks measure narrow skills, so test on your own workload before committing. Released 2026-09-01.
claude-fable-5.1requesty routes this id across every provider serving claude-fable-5.1, picking on price and health and failing over automatically. the id stays valid when a provider changes underneath it
Base url is https://router.requesty.ai/v1 for every id here. One key reaches the whole catalog.
from openai import OpenAI client = OpenAI( api_key="YOUR_REQUESTY_API_KEY", base_url="https://router.requesty.ai/v1",) response = client.chat.completions.create( model="claude-fable-5.1", messages=[ {"role": "user", "content": "Explain quantum computing in one paragraph."}, ],) print(response.choices[0].message.content)
Change the base url, use your Requesty key, set the model to any id in the call pane. Existing OpenAI SDK code needs no other edit, and the same key reaches every other model in the catalog, so switching later is a one-parameter change. Browse all models
Claude Fable 5.1 is Anthropic's most capable model, improving on Claude Fable 5 across agentic coding, long running agentic workflows, and knowledge work such as large code refactors, front end and visual code generation, and finance and analysis tasks. It ships a 1M token context window by default with 128K max output, is more token efficient and concise than Fable 5, and supports per message effort control. It is a Mythos class model with robust safeguards.
questions 6
Which providers serve claude-fable-5.1?
How much does claude-fable-5.1 cost?
Is claude-fable-5.1 open weights?
What is the context window of claude-fable-5.1?
How do I use claude-fable-5.1 with the OpenAI SDK?
Should I call claude-fable-5.1 by its managed id or a provider id?
more from anthropic 6
| model | context | from /M | providers |
|---|---|---|---|
| claude-opus-5 | 1M | $5.00 | 3 |
| claude-sonnet-5 | 1M | $2.00 | 3 |
| claude-fable-5 | 1M | $10.00 | 3 |
| claude-opus-4-8 | 1M | $5.00 | 3 |
| claude-opus-4-7 | 1M | $5.00 | 3 |
| claude-sonnet-4-6 | 1M | $3.00 | 3 |
route claude-fable-5.1 through one endpoint
One key for 2 providers on this model and 600+ others. No markup on provider prices, automatic failover, caching built in. Weekly aggregates in the measured pane come from production traffic routed through Requesty, one line per provider on a shared axis. Methodology