MODEL PROOF
Claude Fable 5.1
FRONTIER
Nothing is both better and cheaper under this workload.
- Independent LMArena score
- 1,507.6 ± 8.15 · 5,783 votes
- Context window
- 1M
- Maximum output
- 128K
- Input modalities
- text, image, file
- Output modalities
- text
- Published input price
- $10.00 / 1M tokens
- Published output price
- $50.00 / 1M tokens
- Pricing kind
- fixed
Inspect complete billing conditions and endpoint terms below.
Every price dimension · USD per million tokens
| Input | $10.00/M |
|---|---|
| Output | $50.00/M |
| Cached input | $0.250/M |
| Cache write | $12.50/M |
| Cache write 1h | $20.00/M |
| Reasoning | Unknown/M |
| Web search | $0.01/call |
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
4 provider offers · rates, limits and conditions
Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| Azureazure Endpoint terms
| $10.00 | $50.00 | undeclared | 99.63% |
| Anthropicanthropic Endpoint terms
| $10.00 | $50.00 | undeclared | 99.82% |
| Amazon Bedrockamazon-bedrock Endpoint terms
| $10.00 | $50.00 | undeclared | — |
| Googlegoogle-vertex/global Endpoint terms
| $10.00 | $50.00 | undeclared | 99.87% |
Independent scores
| LMArena Elo | 1507.6max |
|---|
LMArena Elo under CC BY 4.0. Absence of another board is not a score of zero.
Best rankings by task
- gamedev #1of 107 1400
- 3d #1of 100 1423
- svg #1of 76 1343
- fullstack #1of 41 1334
- webapps #1of 40 1323
- python-pptxslides #1of 26 1328
- dataviz #2of 106 1360
- codecategories #3of 108 1342
Capability
| Context window | 1M |
|---|---|
| Max output | 128K |
| Input modes | text, image, file |
| Tool use | yes |
| Reasoning | always on |
| Open weights | Unknown |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-09-23 |
| Quality data | verified |
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Questions this page answers
What does Claude Fable 5.1 cost?
$10.00/M in, $50.00/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription.
Does Claude Fable 5.1 have an independent quality score?
Claude Fable 5.1 has an LMArena score in this catalogue.
What beats Claude Fable 5.1?
Nothing is both better and cheaper than Claude Fable 5.1.
Does this page use Artificial Analysis scores for Claude Fable 5.1?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
MODEL MONUMENT
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The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not.
[](https://undominated.ai/models/anthropic__claude-fable-5.1/)<a href="https://undominated.ai/models/anthropic__claude-fable-5.1/"><img src="https://undominated.ai/badge/anthropic__claude-fable-5.1.svg" alt="Claude Fable 5.1 — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/anthropic__claude-fable-5.1.svg — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never
older than the last deploy.
