MODEL PROOF
Claude Fable 5
BETTER VALUE OPTION
A stored alternative has an equal-or-higher measured score and an equal-or-lower price.
Claude Opus 5.5 · Δ score 20 points · 60% lower measured price · $8.00 / 1M tokens
Gemini 3.8 Flash is a further stored option with these losses: 128K → 66K max output
- Independent LMArena score
- 1,491.7 ± 4.39 · 38,387 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.
Price from Anthropic: the cheapest offer that is serving, at standard delivery and at the maker’s precision or better, at its standard rate.
Every price dimension · USD per million tokens
| Input | $10.00/M |
|---|---|
| Output | $50.00/M |
| Cached input | $1.00/M |
| Cache write | $12.50/M |
| Cache write 1h | $20.00/M |
| Reasoning | Unknown/M |
| Web search | $0.01/call |
| Batch discount | 50% |
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
6 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) |
|---|---|---|---|---|
| Claude Platform on AWSclaude-on-aws Endpoint terms
| $10.00 | $50.00 | undeclared | 100.00% |
| Azureazure Endpoint terms
| $10.00 | $50.00 | undeclared | 99.53% |
| Amazon Bedrockamazon-bedrock Endpoint terms
| $10.00 | $50.00 | undeclared | — |
| Googlegoogle-vertex/global Endpoint terms
| $10.00 | $50.00 | undeclared | 98.71% |
| Anthropicanthropic Endpoint terms
| $10.00 | $50.00 | undeclared | 99.83% |
| Googlegoogle-vertex/europe Endpoint terms
| $11.00 | $55.00 | undeclared | 100.00% |
Independent scores
| LMArena Elo | 1491.7high |
|---|
LMArena Elo under CC BY 4.0. Absence of another board is not a score of zero.
Best rankings by task
- Agenticgamedev #1 1285
- Htmlslides #1 1277
- Agentichtmlslides #1 1254
- Agenticslides(html) #1 1252
- ASCII art #2 1338
- Native Android apps #2 1297
- Godot games #2 1292
- Python pptxslides #3 1295
Per-task Elo and rank from Design Arena, via OpenRouter’s model feed. The rank is the feed’s, and it counts models OpenRouter does not list.
Capability
| Context window | 1M |
|---|---|
| Max output | 128K |
| Input modes | text, image, file |
| Tool use | yes |
| Reasoning | always on |
| Open weights | no |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-10-06 |
| Quality data | verified |
| Cross-checked | vendor page |
A published time-to-first-token figure for this model was implausible (98s) and has been withheld rather than displayed.
Our take
editorial — not a measurementEvaluate Fable for difficult agent workflows where an avoided failure could justify more spend. Compare it with Opus on the same tasks and reasoning settings before choosing it. Use the current proof and benchmark evidence on this page for measured standing. The data layer withholds a suspect latency figure, so that figure cannot establish suitability for interactive work.
Strengths
- Tool use and structured outputs are listed in the accepted record
- Cache and batch pricing are recorded separately
Weaknesses
- Measure latency on your own prompts; the withheld figure is not usable evidence
- Compare tokenizer counts on the actual text rather than assuming identical token bills across models
Reach for it when
- Evaluation for difficult agent tasks
- Workflows that can measure quality and cost per completed task
Avoid it if
- Your application requires a latency guarantee you have not tested
- A less expensive candidate already passes your evaluations
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and...
Questions this page answers
What does Claude Fable 5 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 have an independent quality score?
Claude Fable 5 has an LMArena score in this catalogue.
What beats Claude Fable 5?
Claude Opus 5.5 has an equal-or-higher measured score and an equal-or-lower price.
Does this page use Artificial Analysis scores for Claude Fable 5?
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/)<a href="https://undominated.ai/models/anthropic__claude-fable-5/"><img src="https://undominated.ai/badge/anthropic__claude-fable-5.svg" alt="Claude Fable 5 — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/anthropic__claude-fable-5.svg — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never
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