AnthropicMultimodalReleased 1 September 2026
Claude Fable 5.1 pricing, context and benchmark
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...
1M
Input context
128K
Output context
$10
Official input
$50
Official output
49
AA index
01 · Model Overview
Everything that matters, in one table
Context, pricing, cache, modalities and tooling, from the model registry and Artificial Analysis.
| Model | Claude Fable 5.1 |
| Model ID | anthropic/claude-fable-5.1 |
| Provider | Anthropic |
| Release date | 1 September 2026 |
| Status | Generally available |
| Input context | 1,000,000 tokens |
| Output context | 128,000 tokens |
| Official input pricing | $10 per 1M tokens |
| Official output pricing | $50 per 1M tokens |
| Cache read pricing | $0.2 per 1M tokens (98% off input) |
| Market input pricing | $10 per 1M (cheapest route) |
| Market output pricing | $50 per 1M (cheapest route) |
| Input modalities | text · image · file |
| Output modalities | text |
| Reasoning control | Not exposed |
| Tool support | Text generation only |
| Tokenizer | Claude |
| Provider routes | 4 endpoints |
| Artificial Analysis index | 49 (#24 of 74) |
| Speed | 87 tokens/s, 166.95s to first token |
| Knowledge cutoff | Not publicly stated |
Input and output support
| Modality | Input | Output | Billed at |
|---|---|---|---|
| Text | ✓ yes | ✓ yes | $10 in |
| Image | ✓ yes | no | $10 in |
| Audio | no | no | not supported |
| Video | no | no | not supported |
| File (PDF) | ✓ yes | no | $10 in |
02 · Overview
What is Claude Fable 5.1?
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...
Claude Fable 5.1 carries a 1M token window, uses the Claude tokenizer and is served by Anthropic. On Hoodgen it sits in the Multimodal tier of the model menu next to its siblings, so you can switch mid conversation without losing the thread.
03 · Release
Release and what changed from the previous version
Released1 September 2026
| Property | Claude Opus 5 | Claude Fable 5.1 | Change |
|---|---|---|---|
| Released | 2026 | Sep 2026 | Newer release |
| Context | 1M | 1M | Unchanged |
| Max output | 128K | 128K | Unchanged |
| Input price | $5 | $10 | Higher |
| Output price | $25 | $50 | Higher |
| Input modalities | text, image, file | text, image, file | Unchanged |
| AA index | 44 | 49 | Newer benchmark run |
04 · Capabilities
Features and capabilities
◉
Vision
Screenshots, charts and photographed documents are read at the text token rate.
▤
Files and PDFs
Documents go in as files rather than pasted text, keeping layout and tables intact.
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Prompt caching
Cached input costs $0.2 per million instead of $10, so stable prefixes get cheaper.
06 · Benchmarks
Benchmark results and performance
Artificial Analysis Intelligence Index v5.0.1 blends nine evaluations. Claude Fable 5.1 scores 49 , ranking #24 of 74.
Intelligence index
49
#24 of 74
Cost per task
$12.99
weighted average per index task
Time per task
22.5m
inference time
Output speed
87
tokens per second
Index score and cost per task
Scale: index 0 to 70, cost 0 to $20. Sub scores are not published per evaluation, so none are invented here.
07 · Use cases
What can you do with Claude Fable 5.1?
Document understanding
Screenshots, charts, scanned pages and PDFs read in the prompt.
Mixed media briefs
One thread holding text, images and files together.
Extraction
Schema constrained JSON out of messy inputs.
Research synthesis
Several sources condensed with the figures preserved.
08 · Cost levers
Prompt caching and how to cut the bill
Cached input bills at $0.2 per million instead of $10, a 98% discount. Keep the system prompt and documents first and the changing question last, so every call hits the cache.
09 · Pricing
Claude Fable 5.1 pricing
Official pricing
List price
$10 / 1M in
$50 / 1M out
- $0.2 cached input
- 1M context
- text, image, file input
Cheapest route
$10 / 1M in
$50 / 1M out
- 4 routes on OpenRouter
- What Hoodgen routes to first
- Same model, lower bill
Market pricing, every route
| Provider | Tier | Input | Output | Cache read | Uptime 24h |
|---|---|---|---|---|---|
| Azure | standard | $10 | $50 | $0.25 | 100.0% |
| Anthropic | standard | $10 | $50 | $0.25 | 99.9% |
| Amazon Bedrock | standard | $10 | $50 | $0.25 | n/a |
| standard | $10 | $50 | $0.25 | 100.0% |
API pricing and cost calculator
| Rate | Per call | Total | Credits |
|---|---|---|---|
| Cheapest route | $0.1580 | $79.00 | 75050 |
| List price | $0.1574 | $78.70 | 74765 |
10 · Developers
API and developer information
| Model ID | anthropic/claude-fable-5.1 |
| Endpoint | https://openrouter.ai/api/v1/chat/completions |
| Parameters | prompt and max_tokens |
| Streaming | Yes, server sent events |
| Modality string | text+image+file->text |
| Max prompt tokens | 1,000,000 |
| Max completion tokens | 128,000 |
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "anthropic/claude-fable-5.1",
"messages": [{ "role": "user", "content": "Summarise this document." }],
"max_tokens": 1024
}'11 · Limitations
Model limitations
| Text only output | It cannot generate images, audio or video. Pair it with an image model on Hoodgen when you need visuals. |
| Output cap | 128,000 tokens per request. Long deliverables have to be chunked. |
| Knowledge cutoff | The provider does not state a fixed cutoff for every release. Verify very recent events against search. |
12 · Comparison
Claude Fable 5.1 vs other Anthropic models
| Model | Context | Input /1M | Output /1M | AA index | Released |
|---|---|---|---|---|---|
| Claude Fable 5.1 | 1M | $10 | $50 | 49 | Sep 2026 |
| Claude Opus 4.1 | 200K | $15 | $75 | n/a | 2025 |
| Claude Fable 5 | 1M | $10 | $50 | n/a | 2026 |
| Claude Fable 5.2 | 1M | $8 | $40 | n/a | 2026 |
| Claude Opus 4.5 | 200K | $5 | $25 | n/a | 2025 |
| Claude Opus 4.7 | 1M | $5 | $25 | n/a | 2026 |
13 · Privacy
Privacy and data policy
- On Hoodgen, prompts and attachments answer that request and stay in your conversation history so you can reopen it. They are not used to train models.
- Requests route through OpenRouter to Anthropic and are covered by that provider's API terms.
- Do not paste secrets or personal data you would not send to any hosted model.
14 · FAQ
Claude Fable 5.1 questions, answered
Claude Fable 5.1 is a multimodal model from Anthropic, released 1 September 2026. 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...
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Start chatting with Claude Fable 5.1
Free to try on Hoodgen AI, with a live credit estimate before every send. No API key, no setup.